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Document and Entity Information - USD ($) $ in Millions	12 Months Ended
Document and Entity Information - USD ($) $ in Millions	Dec. 31, 2014	Feb. 13, 2015	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	ARCH COAL INC
Entity Central Index Key	0001037676
Document Type	10-K
Document Period End Date	Dec. 31, 2014
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		212,274,662
Entity Well known seasoned issuer	Yes
Entity Voluntary Filers	No
Entity Current reporting status	Yes
Entity Public Float			$ 771.8

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues	$ 2,937,119	$ 3,014,357	$ 3,768,126
Costs, expenses and other operating
Cost of sales (exclusive of items shown separately below)	2,566,193	2,663,136	3,155,099
Depreciation, depletion and amortization	418,748	426,442	492,211
Amortization of acquired sales contracts, net	(13,187)	(9,457)	(25,189)
Change in fair value of coal derivatives and coal trading activities, net	(3,686)	7,845	(16,590)
Asset impairment and mine closure costs	24,113	220,879	539,182
Goodwill impairment	0	265,423	330,680
Contract settlement resulting from Patriot Coal bankruptcy	0	0	(58,335)
Reduction in accrual related to acquired litigation		0	(79,532)
Selling, general and administrative expenses	114,223	133,448	134,299
Other operating income, net	(19,754)	(30,218)	(63,357)
Total operating expenses	3,086,650	3,677,498	4,525,138
Loss from operations	(149,531)	(663,141)	(757,012)
Interest expense, net
Interest expense	(390,946)	(381,267)	(317,615)
Interest and investment income	7,758	6,603	5,473
Interest expense, net	(383,188)	(374,664)	(312,142)
Nonoperating expense
Net loss resulting from early retirement and refinancing of debt	0	(42,921)	(23,668)
Loss from continuing operations before income taxes	(532,719)	(1,080,726)	(1,092,822)
Provision for (benefit from) income taxes	25,634	(335,498)	(353,907)
Loss from continuing operations	(558,353)	(745,228)	(738,915)
Income from discontinued operations, including gain on sale - net of tax	0	103,396	55,228
Net income (loss)	(558,353)	(641,832)	(683,687)
Less: Net income attributable to noncontrolling interest		0	(268)
Net loss attributable to Arch Coal, Inc.	$ (558,353)	$ (641,832)	$ (683,955)
Losses per common share
Basic and diluted LPS- Loss from continuing operations	$ (2.63)	$ (3.52)	$ (3.50)
Basic and diluted LPS - Net loss	$ (2.63)	$ (3.03)	$ (3.24)
Weighted average shares outstanding
Basic and diluted weighted average shares outstanding	212,221	212,098	211,381
Dividends declared per common share	$ 0.01	$ 0.12	$ 0.20

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 734,231	$ 911,099
Short term investments	248,954	248,414
Trade accounts receivable	211,506	198,020
Other receivables	20,511	31,553
Inventories	190,253	264,161
Prepaid royalties	11,118	8,083
Deferred income taxes	52,728	49,144
Coal derivative assets	13,257	14,851
Other current assets	60,193	56,746
Total current assets	1,542,751	1,782,071
Property, plant and equipment
Coal lands and mineral rights	6,040,656	5,991,719
Plant and equipment	2,935,381	2,882,486
Deferred mine development	891,649	979,270
Property, plant and equipment, gross	9,867,686	9,853,475
Less accumulated depreciation, depletion and amortization	(3,414,228)	(3,119,189)
Property, plant and equipment, net	6,453,458	6,734,286
Other assets
Prepaid royalties	66,806	87,577
Equity investments	235,842	221,456
Other noncurrent assets	130,866	164,803
Total other assets	433,514	473,836
Total assets	8,429,723	8,990,193
Current liabilities
Accounts payable	180,113	176,142
Accrued expenses and other current liabilities	302,396	278,587
Current maturities of debt	36,885	33,493
Total current liabilities	519,394	488,222
Long-term debt	5,123,485	5,118,002
Asset retirement obligations	398,896	402,713
Accrued pension benefits	16,260	7,111
Accrued postretirement benefits other than pension	32,668	39,255
Accrued workers’ compensation	94,291	78,062
Deferred income taxes	422,809	413,546
Other noncurrent liabilities	153,766	190,033
Total liabilities	6,761,569	6,736,944
Stockholders' equity
Common stock, $0.01 par value, authorized 260,000 shares, issued 213,791 and 213,792 shares at December 31, 2014 and 2013, respectively	2,141	2,141
Paid-in capital	3,048,460	3,038,613
Treasury stock, at cost	(53,863)	(53,848)
Accumulated deficit	(1,331,825)	(771,349)
Accumulated other comprehensive income	3,241	37,692
Total stockholders’ equity	1,668,154	2,253,249
Total liabilities and stockholders’ equity	$ 8,429,723	$ 8,990,193

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income (loss)	$ (558,353)	$ (641,832)	$ (683,687)
Derivative instruments
Comprehensive income (loss) before tax	3,102	(2,626)	10,894
Income tax benefit (provision)	(1,117)	947	(3,921)
Derivatives Qualifying as Hedges, Adjustment, Net of Tax	1,985	(1,679)	6,973
Pension, postretirement and other post-employment benefits
Comprehensive income (loss) before tax	(44,143)	77,201	(21,291)
Income tax benefit (provision)	(15,891)	27,803	(7,686)
Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(28,252)	49,398	(13,605)
Available-for-sale securities
Comprehensive income (loss) before tax	(12,788)	10,190	(3,000)
Income tax benefit (provision)	4,604	(3,710)	1,080
Available-for-sale Securities Adjustment, Net of Tax	(8,184)	6,480	(1,920)
Total other comprehensive income (loss)	(34,451)	54,199	(8,552)
Total comprehensive income (loss)	$ (592,804)	$ (587,633)	$ (692,239)

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	260,000,000	260,000,000
Common stock, shares issued	213,791,000	213,791,799

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activties
Net loss	$ (558,353)	$ (641,832)	$ (683,687)
Adjustments to reconcile net loss to cash provided by operating activities:
Depreciation, depletion and amortization	418,748	447,704	525,508
Amortization of acquired sales contracts, net	(13,187)	(9,457)	(25,189)
Prepaid royalties expensed	9,698	13,706	22,650
Deferred income taxes	25,152	(263,099)	(336,036)
Employee stock-based compensation expense	9,847	11,790	11,822
Gains on disposals and divestitures	(27,512)	(120,321)	0
Asset impairment and mine closure costs	16,868	220,879	531,234
Goodwill impairment	0	265,423	330,680
Amortization of premiums on debt securities held	0	3,680
Amortization relating to financing activities	17,363	24,789	20,238
Net loss resulting from early retirement of debt and financing activities		(42,921)	(23,668)
Changes in:
Receivables	(8,991)	62,881	113,531
Inventories	41,548	44,635	9,468
Coal derivative assets and liabilities	5,449	3,606	(13,158)
Accounts payable, accrued expenses and other current liabilities	41,680	(78,126)	(170,430)
Asset retirement obligations	18,288	17,432	(42,531)
Pension, postretirement and other postemployment benefits	(25,347)	7,284	12,319
Other	(4,833)	1,847	2,717
Cash provided by (used in) operating activities	(33,582)	55,742	332,804
Investing activities
Capital expenditures	(147,286)	(296,984)	(395,225)
Minimum royalty payments	(7,317)	(14,947)	(13,269)
Proceeds from sale-leaseback transactions	0	34,919
Proceeds from disposals and divestitures	62,358	433,453	22,825
Purchases of short term investments	211,929	213,726	236,862
Proceeds from sales of short term investments	205,611	194,537	1,754
Proceeds from Sale of Available-for-sale Securities, Equity	9,464	0	0
Investments in and advances to affiliates, net	(16,657)	(15,260)	(17,758)
Purchase of noncontrolling interest	0	0	(17,500)
Change in restricted cash	0	3,453	6,869
Cash provided by (used in) investing activities	(105,756)	125,445	(649,166)
Financing activities
Proceeds from Issuance of Secured Debt		294,000	1,633,500
Proceeds from issuance of senior notes	0	350,000	359,753
Payments to retire debt	(300)	(628,660)	(452,934)
Payments on term loan	(19,500)	(17,250)	(7,625)
Net decrease in borrowings under lines of credit	0		(481,300)
Net payments on other debt	(5,395)	(6,836)	(682)
Debt financing costs	(4,519)	(20,489)	(50,568)
Dividends paid	(2,123)	(25,475)	(42,440)
Proceeds from exercise of options under incentive plans			5,131
Other	(5,693)	0	0
Cash provided by (used in) financing activities	(37,530)	(54,710)	962,835
Increase (decrease) in cash and cash equivalents	(176,868)	126,477	646,473
Cash and cash equivalents, beginning of period	911,099	784,622	138,149
Cash and cash equivalents, end of period	734,231	911,099	784,622
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid during the year for interest	361,727	380,389	310,241
Cash refunded during the year for income taxes, net	$ (4,896)	$ (18,741)	$ (28,057)

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2012	$ 2,854,567	$ 2,141	$ 3,026,823	$ (53,848)	$ (104,042)	$ (16,507)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Total comprehensive income (loss)	(587,633)	0	0	0
Other Comprehensive Income (Loss), Net of Tax	$ 54,199
Dividends declared per common share	$ 0.12
Dividends, Common Stock	$ (25,475)	0	0	0	(25,475)	0
Issuance of shares of common stock under the stock incentive plan — restricted stock and restricted stock units, net of forfeitures	0	0	0	0	0	0
Employee stock-based compensation expense	11,790	0		0	0	0
Ending Balance at Dec. 31, 2013	2,253,249	2,141	3,038,613	(53,848)	(771,349)	37,692
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Total comprehensive income (loss)	(592,804)	0	0	0
Other Comprehensive Income (Loss), Net of Tax	$ (34,451)
Dividends declared per common share	$ 0.01
Dividends, Common Stock	$ (2,123)	0	0	0	(2,123)	0
Treasury shares purchased	(15)	0	0	(15)	0	0
Employee stock-based compensation expense	9,847	0		0	0	0
Ending Balance at Dec. 31, 2014	$ 1,668,154	$ 2,141	$ 3,048,460	$ (53,863)	$ (1,331,825)	$ 3,241

Consolidated Statements of Stockholders' Equity (Parenthetical) - shares	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	0	39,000	49,000
Stock Issued During Period, Value, Stock Options Exercised	(1,000)	0	526,000
Treasury shares purchased	5,337

Basis of Presentation	12 Months Ended
Basis of Presentation	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying consolidated financial statements include the accounts of Arch Coal, Inc. and its subsidiaries and controlled entities (the “Company”). The Company’s primary business is the production of thermal and metallurgical coal from surface and underground mines located throughout the United States, for sale to utility, industrial and steel producers both in the United States and around the world. The Company currently operates mining complexes in West Virginia, Kentucky, Maryland, Virginia, Illinois, Wyoming and Colorado. All subsidiaries are wholly-owned. Intercompany transactions and accounts have been eliminated in consolidation. The Company completed the sale of Canyon Fuel Company, LLC (Canyon Fuel) on August 16, 2013. The results of these mining complexes have been segregated from continuing operations and are reflected, net of tax, as discontinued operations in the consolidated statements of operations for all periods presented. See further discussion in Note 3, "Divestitures". In response to weak coal markets, the Company has idled or closed mines in the Appalachia region and sold other non-core operating subsidiaries and assets. The results from these operations and gains or losses on the disposal are reflected in income from continuing operations in the consolidated statements of operations. See further discussion in Note 5, "Impairment Charges and Mine Closure Costs".

Accounting Policies	12 Months Ended
Accounting Policies	Dec. 31, 2014
Accounting Policies [Abstract]
Accounting Policies	Accounting Policies The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for financial reporting and U.S. Securities and Exchange Commission regulations. Accounting Pronouncements There are no accounting pronouncements whose adoption had, or is expected to have, a material impact on the Company's consolidated financial statements. Accounting Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and revenues and expenses in the accompanying consolidated financial statements and the disclosure of contingent assets and liabilities. Actual results could differ from those estimates. Cash and Cash Equivalents Cash and cash equivalents are stated at cost. Cash equivalents consist of highly-liquid investments with an original maturity of three months or less when purchased. Accounts Receivable Accounts receivable are recorded at amounts that are expected to be collected, based on past collection history, the economic environment and specified risks identified in the receivables portfolio. Inventories Coal and supplies inventories are valued at the lower of average cost or market. Coal inventory costs include labor, supplies, equipment costs, transportation costs incurred prior to the transfer of title to customers and operating overhead. The costs of removing overburden, called stripping costs, incurred during the production phase of the mine are considered variable production costs and are included in the cost of the coal extracted during the period the stripping costs are incurred. Investments and Membership Interests in Joint Ventures Investments and membership interests in joint ventures are accounted for under the equity method of accounting if the Company has the ability to exercise significant influence, but not control, over the entity. The Company's share of the entity's income or loss is reflected in "Other operating income, net" in the consolidated statements of operations. Information about investment activity is provided in Note 9, " Equity Method Investments and Membership Interests in Joint Ventures". Investments in debt securities and marketable equity securities that do not qualify for equity method accounting are classified as available-for-sale and are recorded at their fair values. Unrealized gains and losses on these investments are recorded in other comprehensive income or loss. A decline in the value of an investment that is considered other-than-temporary would be recognized in operating expenses. Acquired Sales Contracts Coal supply agreements (sales contracts) acquired in a business combination are capitalized at their fair value and amortized over the tons of coal shipped during the term of the contract. The fair value of a sales contract is determined by discounting the cash flows attributable to the difference between the contract price and the prevailing forward prices for the tons under contract at the date of acquisition. See Note 10, "Acquired Sales Contracts" for further information related to the Company's acquired sales contracts. Exploration Costs Costs to acquire permits for exploration activities are capitalized. Drilling and other costs related to locating coal deposits and evaluating the economic viability of such deposits are expensed as incurred. Prepaid Royalties Leased mineral rights are often acquired through royalty payments. When royalty payments represent prepayments recoupable against royalties owed on future revenues from the underlying coal, they are recorded as a prepaid asset, with amounts expected to be recouped within one year classified as current. When coal from these leases is sold, the royalties owed are recouped against the prepayment and charged to cost of sales. An impairment charge is recognized for prepaid royalties that are not expected to be recouped. Property, Plant and Equipment Plant and Equipment Plant and equipment are recorded at cost. Interest costs incurred during the construction period for major asset additions are capitalized. We capitalized $15.9 million and $15.6 million of interest costs during the years ended December 31, 2013 and 2012, respectively. Expenditures that extend the useful lives of existing plant and equipment or increase the productivity of the asset are capitalized. The cost of maintenance and repairs that do not extend the useful life or increase the productivity of the asset is expensed as incurred. Preparation plants and loadouts are depreciated using the units-of-production method over the estimated recoverable reserves, subject to a minimum level of depreciation. Other plant and equipment are depreciated principally using the straight-line method over the estimated useful lives of the assets, limited by the remaining life of the mine. The useful lives of mining equipment, including longwalls, draglines and shovels, range from 5 to 32 years. The useful lives of buildings and leasehold improvements generally range from 10 to 30 years. Deferred Mine Development Costs of developing new mines or significantly expanding the capacity of existing mines are capitalized and amortized using the units-of-production method over the estimated recoverable reserves that are associated with the property being benefited. Costs may include construction permits and licenses; mine design; construction of access roads, shafts, slopes and main entries; and removing overburden to access reserves in a new pit. Additionally, deferred mine development includes the asset cost associated with asset retirement obligations. Coal Lands and Mineral Rights Rights to coal reserves may be acquired directly through governmental or private entities. A significant portion of the Company's coal reserves are controlled through leasing arrangements. Lease agreements are generally long-term in nature (original terms range from 10 to 50 years), and substantially all of the leases contain provisions that allow for automatic extension of the lease term providing certain requirements are met. The net book value of the Company's coal interests was $4.7 billion and $4.8 billion at December 31, 2014 and 2013, respectively. Payments to acquire royalty lease agreements and lease bonus payments are capitalized as a cost of the underlying mineral reserves and depleted over the life of proven and probable reserves. Coal lease rights are depleted using the units-of-production method, and the rights are assumed to have no residual value. Future lease bonus payments total $75.4 million in 2015 and $60.0 million in 2016. Depreciation, depletion and amortization. The depreciation, depletion and amortization related to long-lived assets is reflected in the statement of operations as a separate line item. No depreciation, depletion or amortization is included in any other operating cost categories. Impairment If facts and circumstances suggest that the carrying value of a long-lived asset or asset group may not be recoverable, the asset or asset group is reviewed for potential impairment. If this review indicates that the carrying amount of the asset will not be recoverable through projected undiscounted cash flows generated by the asset and its related asset group over its remaining life, then an impairment loss is recognized by reducing the carrying value of the asset to its fair value. The Company may, under certain circumstances, idle mining operations in response to market conditions or other factors. Because an idling is not a permanent closure, it is not considered an automatic indicator of impairment. See additional discussion in Note 5, "Impairment Charges and Mine Closure Costs". Goodwill In a business combination, goodwill represents the excess of the purchase price over the fair value assigned to the net tangible and identifiable intangible assets acquired. The Company tests goodwill for impairment annually as of the beginning of the fourth quarter, or when circumstances indicate a possible impairment may exist. If the results of the testing indicate that the carrying amount of a reporting unit exceeds the fair value of the reporting unit, the fair value of goodwill must be calculated. An impairment loss generally would be recognized when the carrying amount of goodwill exceeds the implied fair value of goodwill, determined by subtracting the fair value of the other assets and liabilities associated with the reporting unit from the total fair value of the reporting unit. The fair value of a reporting unit is determined using a discounted cash flow ("DCF") technique. A number of significant assumptions and estimates are involved in the application of the DCF analysis to forecast operating cash flows, including the discount rate, projections of production volumes, quality and costs to produce; projections of sales volumes by market (e.g., thermal versus metallurgical); and projections of market prices. See additional discussion in Note 6, "Goodwill." Deferred Financing Costs The Company capitalizes costs incurred in connection with new borrowings, the establishment or enhancement of credit facilities and the issuance of debt securities. These costs are amortized as an adjustment to interest expense over the life of the borrowing or term of the credit facility using the interest method. The unamortized balance of deferred financing costs was $89.1 million and $99.2 million at December 31, 2014 and 2013, respectively. Amounts classified as current were $25.5 million and $19.7 million at December 31, 2014 and 2013, respectively. Current amounts are recorded in "Other current assets" and noncurrent amounts are recorded in "Other noncurrent assets" in the accompanying consolidated balance sheets. Revenue Recognition Revenues include sales to customers of coal produced at Company operations and coal purchased from third parties. The Company recognizes revenue at the time risk of loss passes to the customer at contracted amounts. Transportation costs are included in cost of sales and amounts billed by the Company to its customers for transportation are included in revenues. Other Operating Income and Expenses Other operating income, net in the accompanying consolidated statements of operations reflects income and expense from sources other than physical coal sales, including: bookouts, or the practice of offsetting purchase and sale contracts for shipping convenience purposes; contract settlements; liquidated damage charges related to unused terminal and port capacity; royalties earned from properties leased to third parties; income from equity investments (Note 9); gains and losses from divestitures and dispositions of assets (Note 3 ); and realized gains and losses on derivatives that do not qualify for hedge accounting and are not held for trading purposes (Note 11). Asset Retirement Obligations The Company's legal obligations associated with the retirement of long-lived assets are recognized at fair value at the time the obligations are incurred. Accretion expense is recognized through the expected settlement date of the obligation. Obligations are incurred at the time development of a mine commences for underground and surface mines or construction begins for support facilities, refuse areas and slurry ponds. The obligation's fair value is determined using a discounted cash flow technique and is based upon permit requirements and various estimates and assumptions that would be used by market participants, including estimates of disturbed acreage, reclamation costs and assumptions regarding equipment productivity. Upon initial recognition of a liability, a corresponding amount is capitalized as part of the carrying value of the related long-lived asset. The Company reviews its asset retirement obligation at least annually and makes necessary adjustments for permit changes as granted by state authorities and for revisions of estimates of the amount and timing of costs. For ongoing operations, adjustments to the liability result in an adjustment to the corresponding asset. For idle operations, adjustments to the liability are recognized as income or expense in the period the adjustment is recorded. Any difference between the recorded obligation and the actual cost of reclamation is recorded in profit or loss in the period the obligation is settled. See additional discussion in Note 15, "Asset Retirement Obligations." Loss Contingencies The Company accrues for cost related to contingencies when a loss is probable and the amount is reasonably determinable. Disclosure of contingencies is included in the financial statements when it is at least reasonably possible that a material loss or an additional material loss in excess of amounts already accrued may be incurred. The amount accrued represents the Company's best estimate of the loss, or, if no best estimate within a range of outcomes exists, the minimum amount in the range. Derivative Instruments The Company generally utilizes derivative instruments to manage exposures to commodity prices. Additionally, the Company may hold certain coal derivative instruments for trading purposes. Derivative financial instruments are recognized in the balance sheet at fair value. Certain coal contracts may meet the definition of a derivative instrument, but because they provide for the physical purchase or sale of coal in quantities expected to be used or sold by the Company over a reasonable period in the normal course of business, they are not recognized on the balance sheet. Certain derivative instruments are designated as the hedge instrument in a hedging relationship. In a fair value hedge, the Company hedges the risk of changes in the fair value of a firm commitment, typically a fixed-price coal sales contract. Changes in both the hedged firm commitment and the fair value of a derivative used as a hedge instrument in a fair value hedge are recorded in earnings. In a cash flow hedge, the Company hedges the risk of changes in future cash flows related to a forecasted purchase or sale. Changes in the fair value of the derivative instrument used as a hedge instrument in a cash flow hedge are recorded in other comprehensive income or loss. Amounts in other comprehensive income or loss are reclassified to earnings when the hedged transaction affects earnings and are classified in a manner consistent with the transaction being hedged. The Company formally documents the relationships between hedging instruments and the respective hedged items, as well as its risk management objectives for hedge transactions. The Company evaluates the effectiveness of its hedging relationships both at the hedge's inception and on an ongoing basis. Any ineffective portion of the change in fair value of a derivative instrument used as a hedge instrument in a fair value or cash flow hedge is recognized immediately in earnings. The ineffective portion is based on the extent to which exact offset is not achieved between the change in fair value of the hedge instrument and the cumulative change in expected future cash flows on the hedged transaction from inception of the hedge in a cash flow hedge or the change in the fair value. Ineffectiveness was insignificant for the years ended December 31, 2014, 2013 and 2012 See Note 11, "Derivatives" for further disclosures related to the Company's derivative instruments. Fair Value Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly hypothetical transaction between market participants at a given measurement date. Valuation techniques used must maximize the use of observable inputs and minimize the use of unobservable inputs. See Note 16, "Fair Values Measurements" for further disclosures related to the Company's recurring fair value estimates. Income Taxes Deferred income taxes are provided for temporary differences arising from differences between the financial statement and tax basis of assets and liabilities existing at each balance sheet date using enacted tax rates anticipated to be in effect when the related taxes are expected to be paid or recovered. A valuation allowance is established if it is more likely than not that a deferred tax asset will not be realized. Management reassesses the ability to realize its deferred tax assets annually in the fourth quarter or when circumstances indicate that the ability to realize deferred tax assets has changed. In determining the need for a valuation allowance, the Company considers projected realization of tax benefits based on expected levels of future taxable income, available tax planning strategies and the reversal of temporary differences. Benefits from tax positions that are uncertain are not recognized unless the Company concludes that it is more likely than not that the position would be sustained in a dispute with taxing authorities, should the dispute be taken to the court of last resort. The Company would measure any such benefit at the largest amount of benefit that is greater than 50 percent likely of being realized upon settlement with taxing authorities. See Note 14, "Taxes" for further disclosures about income taxes. Benefit Plans The Company has non-contributory defined benefit pension plans covering most of its salaried and hourly employees. Benefits are generally based on the employee's age and compensation. The Company also currently provides certain postretirement medical and life insurance coverage for eligible employees. The cost of providing these benefits are determined on an actuarial basis and accrued over the employee's period of active service. The Company recognizes the overfunded or underfunded status of these plans as determined on an actuarial basis on the balance sheet and the changes in the funded status are recognized in other comprehensive income. See Note 20, "Employee Benefit Plans" for additional disclosures relating to these obligations. Stock-Based Compensation The compensation cost of all stock-based awards is determined based on the grant-date fair value of the award, and is recognized over the requisite service period. The grant-date fair value of option awards is determined using a Black-Scholes option pricing model. Compensation cost for an award with performance conditions is accrued if it is probable that the conditions will be met. See further discussion in Note 18, "Stock-Based Compensation and Other Incentive Plans ." Accounting Standards Issued In May 2014, the FASB issued comprehensive authoritative guidance for the recognition and presentation of revenue from contracts with customers. The revenue recognition model is based on changes in contract assets (right to receive consideration) and liabilities (obligations to provide a good or perform a service). The guidance also requires comprehensive quantitative and qualitative disclosures intended to enable financial statement users to understand the nature, timing and uncertainty of revenue and the related cash flows. This guidance will be effective for the Company in the first quarter of 2017, with early adoption not permitted. The Company is currently assessing the impact the guidance will have upon adoption, but expects no significant changes to its existing revenue recognition policies. In August 2014, the FASB issued guidance requiring management to evaluate whether there are conditions or events, considered in the aggregate, that raise substantial doubt about the entity's ability to continue as a going concern within one year after the date that the financial statements are issued and requires disclosures to describe the principal conditions or events that raise substantial doubt and management's evaluation and plans to alleviate such doubt. If the doubt is not alleviated by management's plans, the notes to the financial statements must include a statement that the doubt exists. This requirement is effective for annual and interim periods starting with the period ending December 31, 2016.

Divestitures

12 Months Ended

Dec. 31, 2014

Discontinued Operations and Disposal Groups [Abstract]

Divestitures

The following table summarizes the assets and liabilities of these divested operations reflected in the December 31, 2013 consolidated balance sheet (in thousands):




Inventories	$	33,730
Other current assets	2,060
Net property, plant & equipment	35,560
Other noncurrent assets	190
Accounts payable and accrued expenses	10,599
Other noncurrent liabilities	38,340

As part of a strategy to divest non-core thermal coal assets, the Company entered into a definitive agreement on June 27, 2013 to sell Canyon Fuel, to Bowie Resources, LLC. Canyon Fuel operated two longwall mining complexes and a continuous miner operation in Utah. The sale was completed on August 16, 2013, for $422.7 million in cash, including adjustments to the purchase price to finalize working capital.

The following table summarizes the results of discontinued operations through the date of disposition:



	Year Ended December 31,
	2013		2012

Total Revenues	$	219,002	$	390,912
Income from discontinued operations before income taxes	$	32,167	$	75,418
Gain on sale	120,321		—
Less: income tax expense	49,092		20,190
Income from discontinued operations, including gain on sale - net of tax	$	103,396	$	55,228

Basic earnings per common share from discontinued operations	$	0.49	$	0.26
Diluted earnings per common share from discontinued operations	$	0.49	$	0.26

- Definition

Tabular disclosure of disposal groups, which may include the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the classification and carrying value of the assets and liabilities comprising the disposal group, and the segment in which the disposal group was reported. Also may include the amount of adjustments to amounts previously reported in discontinued operations such as resolution of contingencies arising from the disposal transaction or the operations of the component prior to disposal.

+ References + Details

Accumulated Other Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2014

Accumulated Other Comprehensive Income (Loss) [Abstract]

Accumulated Other Comprehensive Income (Loss)

The following items are included in accumulated other comprehensive income (loss):




					Pension,
					Postretirement						Accumulated
					and Other Post-						Other
		Derivative			Employment			Available-for-			Comprehensive
		Instruments			Benefits			Sale Securities			Income (Loss)
		(In thousands)
Balance at	January 1, 2013	$	2,244		$	(18,286	)	$	(465	)	$	(16,507	)
Unrealized gains		168			48,482			5,935			54,585
Amounts reclassified from accumulated other comprehensive income (loss)		(1,847		)	916			545			(386		)
Balance at	December 31, 2013	565			31,112			6,015			37,692
Unrealized gains (losses)		3,677			(22,516		)	(5,727		)	(24,566		)
Amounts reclassified from accumulated other comprehensive income (loss)		(1,692		)	(5,736		)	(2,457		)	(9,885		)
Balance at	December 31, 2014	$	2,550		$	2,860		$	(2,169	)	$	3,241

The following amounts were reclassified out of accumulated other comprehensive income (loss) during the years ended December 31, 2014 and 2013, respectively:



Details about accumulated other comprehensive income components	Reclassifications							Line Item in the Consolidated Statement of Operations
	2014				2013
	(in thousands)
Derivative instruments	$	2,643			$	2,886		Revenues
	(951		)		(1,039		)	Provision for (benefit from) income taxes
	$	1,692			$	1,847		Net of tax

Pension, postretirement and other post-employment benefits
Amortization of prior service credits	$	11,760		¹	$	13,705
Amortization of net actuarial gains (losses)	(2,797		)	¹	(15,136		)
	8,963				(1,431		)	Total before tax
	(3,227		)		515			Provision for (benefit from) income taxes
	$	5,736			$	(916	)	Net of tax

Available-for-sale securities	$	3,838		²	$	(852	)	Interest and investment income
	(1,381		)		307			Provision for (benefit from) income taxes
	$	2,457			$	(545	)	Net of tax
¹ Production-related benefits and workers' compensation costs are included in costs to produce coal.
2 The gains and losses on sales of available-for-sale-securities are determined on a specific identification basis.

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669619-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e716-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e709-108580

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Reclassification Adjustments
-URI http://asc.fasb.org/extlink&oid=6522872

+ Details

Impairment Charges and Mine Closure Costs

12 Months Ended

Dec. 31, 2014

Impairment Charges and Mine Closure Costs [Abstract]

Impairment Charges and Mine Closure Costs

The following discussions describe the costs reflected on the line "Asset impairment and mine closure costs" in the consolidated statements of operations.

In response to weak metallurgical coal markets the Company idled a higher-cost mining complex in the third quarter of 2014 in order to concentrate on metallurgical coal production from its lowest-cost and highest-margin operations. Closure charges of $5.1 million were recognized during the third quarter of 2014 relating to the idling.

During the Company's annual budgeting process for 2015, a review of our forecasted revenues indicated that the remaining balance of advance royalty payments made on a reserve base supplying the Company's Mountain Laurel, Spruce Mine and Briar Branch operations would not be recoupable against future royalties payments. Under the lease, any unrecouped advance payment balance at March 31, 2017 will be forfeited by the Company. Based on estimates of sales volumes and pricing through the end of the recoupment period, an impairment charge was recorded for$15.4 million of the remaining $48.0 million balance that would not be recouped.

As a result of the weak thermal coal markets in Appalachia, the Company assessed in the third quarter of 2013 whether the carrying values of certain assets were recoverable through future cash flows. The Company determined that the carrying amounts of certain assets associated with the Hazard mining complex in Kentucky and the Company's ADDCAR subsidiary, which manufactures and sells its patented highwall mining system, could not be recovered through future cash flows expected to be generated from use of the assets and their ultimate disposal.

The assets' fair values were determined based on projections of cash flows to be generated from use of the assets and their ultimate disposal including estimates relating to market demand, coal prices, production costs and mine plans, and recovery value of the assets. An impairment charge of $142.8 million was recognized to adjust the carrying value of the assets to their fair value of $71.3 million.

During 2013, the Company also recognized other-than-temporary impairment charges related to equity method investments. See further discussion in Note 9, "Equity Method Investments and Membership Interests in Joint Ventures."

In 2012, the closure and idling of mines in Appalachia discussed in Note 1, "Basis of Presentation" resulted in closure costs and related impairment charges as follow:



	In millions
Parts and supplies inventory writedown	$	2.6
Impairment of property, plant and equipment	95.6
Impairment of coal properties and deferred development costs	403.3
Royalty obligations	11.5
Employee termination benefits	12.3
Pension, postretirement and occupational disease curtailment gain, net	(1.8		)
	$	523.5

In 2012, the value of an acquired sales contract was also determined to be impaired, see further discussion in Note 10, "Acquired Sales Contracts " for further discussion.

Goodwill

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

Changes in the carrying value of goodwill for the three years ended December 31, 2014 are as follows:



	(In thousands)
Balance at January 1, 2012	$	596,103
Impairment	(330,680		)
Balance at December 31, 2012	265,423
Impairment	(265,423		)
Balance at December 31, 2013	$	—

During the second quarter of 2012, the Company concluded the fair value of the Company’s goodwill could be less than its carrying value, based on a significant drop in the Company’s stock price combined with continuing weak demand for thermal coal. Accordingly, the Company performed the first step of the two-step goodwill impairment test as of June 30, 2012. The value of the Company’s Black Thunder reporting unit in the Powder River Basin, where $115.8 million of goodwill had been allocated, was sensitive to market demand for thermal coal and the further weakening in thermal coal markets had significantly impacted the projected demand for and pricing of coal produced at Black Thunder. In step one of the goodwill impairment testing, the fair value of the Black Thunder reporting unit did not exceed its carrying value, primarily due to the impact of lower demand on near term sales volumes and pricing. The Company recorded an impairment charge for the entire $115.8 million carrying value of Black Thunder's goodwill in 2012.

During 2012, metallurgical prices fell substantially from the peaks reached during 2011, when the reporting units were acquired with the Company's purchase of ICG. Because the goodwill amounts allocated to certain reporting units in the Company’s Appalachia segment acquired with the ICG acquisition were sensitive to volatility in the demand for metallurgical coal, the fair values of two of these reporting units fell below their carrying value. The allocated goodwill of $214.9 million for those reporting units was determined to be fully impaired, based on the discounted cash flows used in the ICG acquisition valuation, adjusted for current market conditions and estimates of production levels.

The Company performed its annual impairment testing as of October 1, 2013 on the two remaining Appalachia reporting units with goodwill balances, the Leer mining complex and an undeveloped property adjacent to it. The fair value of these two reporting units are sensitive to the volatility in the demand for and pricing of metallurgical coal, and continuing weakness in the metallurgical coal markets resulted in a reassessment of key marketing and operating assumptions during the Company's annual budgeting process. As a result, the book values of the reporting units exceeded their fair values after the first step of the goodwill impairment tests. It was also determined that the goodwill had no fair value, and the Company recognized an impairment loss for the remaining reporting units totaling $265.4 million.

Inventories

12 Months Ended

Dec. 31, 2014

Inventory Disclosure [Abstract]

Inventories

Inventories consist of the following:



	December 31,
	2014		2013
	(In thousands)
Coal	$	71,901	$	117,531
Repair parts and supplies	118,352		137,497
Work-in-process	—		9,133
	$	190,253	$	264,161

The repair parts and supplies are stated net of an allowance for slow-moving and obsolete inventories of $6.6 million at December 31, 2014 and $8.4 million at December 31, 2013.

Investments in Available-for-Sale Securities

12 Months Ended

Dec. 31, 2014

Available-for-sale Securities [Abstract]

Investments in Available-for-Sale Securities

The Company has invested in highly liquid investment-grade corporate bonds. These investments are held in the custody of a major financial institution. These securities, along with the Company's investments in marketable equity securities, are classified as available-for-sale securities and, accordingly, the unrealized gains and losses are recorded through other comprehensive income.

The Company's investments in available-for-sale marketable securities are as follows:



	December 31, 2014
										Balance Sheet
			Gross		Gross					Classification
			Unrealized		Unrealized			Fair		Short-Term		Other
	Cost Basis		Gains		Losses			Value		Investments		Assets
	(In thousands)
Available-for-sale:
Corporate notes and bonds	$	253,590	$	—	$	(4,636	)	$	248,954	$	248,954	$	—
Equity securities	3,910		4,125		(2,890		)	5,145		—		5,145
Total Investments	$	257,500	$	4,125	$	(7,526	)	$	254,099	$	248,954	$	5,145



	December 31, 2013
										Balance Sheet
			Gross		Gross					Classification
			Unrealized		Unrealized			Fair		Short-Term		Other
	Cost Basis		Gains		Losses			Value		Investments		Assets
	(In thousands)
Available-for-sale:
U.S. government and agency securities	$	65,002	$	11	$	(75	)	$	64,938	$	64,938	$	—
Corporate notes and bonds	184,773		7		(1,304		)	183,476		183,476		—
Equity securities	5,271		13,660		(2,902		)	16,029		—		16,029
Total Investments	$	255,046	$	13,678	$	(4,281	)	$	264,443	$	248,414	$	16,029

The aggregate fair value of investments with unrealized losses that had been owned for less than a year was $163.0 million and $164.3 million at December 31, 2014 and 2013, respectively. The aggregate fair value of investments with unrealized losses that have been owned for over a year was $86.1 million and $48.7 million at December 31, 2014 and 2013, respectively.

The debt securities outstanding at December 31, 2014 have maturity dates ranging from the first quarter of 2015

through the first quarter of 2016. The Company classifies its investments as current based on the nature of the investments and their availability to provide cash for use in current operations, if needed.

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References + Details

Equity Method Investments and Membership Interests in Joint Ventures

12 Months Ended

Dec. 31, 2014

Equity Method Investments and Joint Ventures [Abstract]

Equity Method Investments and Membership Interests in Joint Ventures

The Company accounts for its investments and membership interests in joint ventures under the equity method of accounting if the Company has the ability to exercise significant influence, but not control, over the entity. Equity method investments are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the investments may not be recoverable. Certain of the Company's investments are in development stage companies whose success depends on factors including the receipt of permits and other regulatory environmental issues, the ability of the investee companies to raise additional funds in financial markets that can be volatile, and other key business factors, any of which may impact the Company's ability to recover its investment.

Below are the equity method investments reflected in the consolidated balance sheets:



	Investee	Knight Hawk			DTA			Millennium			Tongue River			DKRW			Tenaska			Other			Total

Balance at	January 1, 2012	$	135,225		$	16,086		$	26,324		$	12,989		$	19,715		$	15,266		$	—		$	225,605
Investments in affiliates		—			—			—			—			—			—			—			—
Advances to (distributions from) affiliates, net		(7,151		)	4,335			8,798			1,708			—			—			—			7,690
Equity in comprehensive income (loss)		20,989			(4,959		)	(2,908		)	—			(4,200		)	(2		)	—			8,920
Balance at	December 31, 2012	149,063			15,462			32,214			14,697			15,515			15,264			—			242,215
Advances to (distributions from) affiliates, net		(13,536		)	3,644			6,476			4,004			—			—			200			788
Equity in comprehensive income (loss)		17,279			(4,969		)	(2,796		)	(282		)	(1,832		)	—			—			7,400
Impairment of equity investment		—			—			—			—			(13,683		)	(15,264		)	—			(28,947		)
Balance at	December 31, 2013	152,806			14,137			35,894			18,419			—			—			200			221,456
Advances to (distributions from) affiliates, net		(12,603		)	3,774			6,742			2,541			—			—			3,600			4,054
Equity in comprehensive income (loss)		18,274			(4,173		)	(2,413		)	(220		)	—			—			(1,136		)	10,332
Balance at	December 31, 2014	$	158,477		$	13,738		$	40,223		$	20,740		$	—		$	—		$	2,664		$	235,842

The Company holds a 49% equity interest in Knight Hawk Holdings, LLC ("Knight Hawk"), a coal producer in the Illinois Basin.

The Company holds a general partnership interest of 21.875% in Dominion Terminal Associates ("DTA"), which is accounted for under the equity method. DTA operates a ground storage-to-vessel coal transloading facility in Newport News, Virginia for use by the partners. Under the terms of a throughput and handling agreement with DTA, each partner is charged its share of cash operating and debt-service costs in exchange for the right to use the facility's loading capacity and is required to make periodic cash advances to DTA to fund such costs.

The Company holds a 38% ownership interest in Millennium Bulk Terminals-Longview, LLC ("Millennium"), the owner of a brownfield bulk commodity terminal on the Columbia River near Longview, Washington. Additional future purchase consideration is due upon the completion of certain project milestones. Millennium continues to work on obtaining the required approvals and necessary permits to complete dredging and other upgrades to ship coal, alumina and cementitious material from the terminal. The Company will control 38% of the terminal's throughput and storage capacity, in order to facilitate export shipments of coal off the west coast of the United States.

The Company holds a 35% membership interest in the Tongue River Holding Company, LLC ("Tongue River") joint venture. Tongue River will develop and construct a railway line near Miles City, Montana and the Company's Otter Creek reserves. The Company has the right, upon the receipt of permits and approval for construction or under other prescribed circumstances, to require the other investors to purchase all of the Company's units in the venture at an amount equal to the capital contributions made by the Company at that time, less any distributions received.

The Company holds a 24% equity interest in DKRW Advanced Fuels LLC ("DKRW"), who had entered into an Engineering, Procurement and Construction Agreement with a Chinese company to construct and commission the Medicine Bow coal-to-liquids facility. However, as the project did not progress to the next stage of development, the Company recorded an other-than-temporary impairment charge of $57.7 million in the third quarter of 2013, representing the Company's equity investment of $13.7 million and an outstanding $44.0 million loan receivable balance. The impairment charges are included on the line "Asset impairment and mine closure costs" in the consolidated statement of operations.

During the second quarter of 2013, Tenaska Trailblazer Partners, LLC ("Tenaska") announced that it was discontinuing its development plans for the Trailblazer Energy Center in Texas. As a result, the Company recorded a $20.5 million impairment charge, which consisted of its 35% equity investment of $15.3 million and a $5.2 million receivable balance related to advances for development work. The impairment charges are included on the line "Asset impairment and mine closure costs" in the consolidated statement of operations.

The Company may be required to make future contingent payments of up to $58.5 million related to development financing for certain of its equity investees. The Company’s obligation to make these payments, as well as the timing of any payments required, is contingent upon the achievement of project development milestones, which can be affected by the factors named above.

Acquired Sales Contracts

12 Months Ended

Dec. 31, 2014

Acquired Sales Contracts [Abstract]

Acquired Sales Contracts

The acquired sales contracts reflected in the consolidated balance sheets are as follows:



	December 31, 2014									December 31, 2013
	Assets			Liabilities			Net Total			Assets			Liabilities			Net Total
	(In thousands)									(In thousands)
Acquired fair value	$	131,299		$	166,697					$	131,819		$	166,697
Accumulated amortization	(130,363		)	(134,988		)				(129,449		)	(120,367		)
Total	$	936		$	31,709		$	(30,773	)	$	2,370		$	46,330		$	(43,960	)
Balance Sheet classification:
Other current	$	462		$	12,453					$	1,324		$	14,373
Other noncurrent	$	474		$	19,256					$	1,046		$	31,957

In 2012, the Company recognized an impairment loss of $15.7 million to write off a contract acquired with the ICG acquisition with an original acquired fair value of $17.5 million.

The Company anticipates amortization of acquired sales contracts, based upon expected shipments in the next five years, to be income of approximately $12.2 million in 2015, $7.2 million in 2016, $3.6 million in 2017, and $3.6 million in 2018 and $4.1 million in 2019.

Derivatives

12 Months Ended

Dec. 31, 2014

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives

Diesel fuel price risk management

The Company is exposed to price risk with respect to diesel fuel purchased for use in its operations. The Company anticipates purchasing approximately 57 to 67 million gallons of diesel fuel for use in its operations during 2015. To protect the Company’s cash flows from increases in the price of diesel fuel for its operations, the Company may use forward physical diesel purchase contracts and purchase out-of-the-money heating oil call options to protect against substantial increases in pricing. At December 31, 2014, the Company had heating oil call options for approximately 56 million gallons at an average strike price of $3.13.

The Company has also at times purchased heating oil call options to manage the price risk associated with fuel surcharges on its barge and rail shipments, which cover increases in diesel fuel prices for the respective carriers. These positions reduce the Company’s risk of cash flow fluctuations related to these surcharges but the positions are not accounted for as hedges. The Company had no positions outstanding at December 31, 2014.

Coal risk management positions

The Company may sell or purchase forward contracts, swaps and options in the over-the-counter coal market in order to manage its exposure to coal prices. The Company has exposure to the risk of fluctuating coal prices related to forecasted sales or purchases of coal or to the risk of changes in the fair value of a fixed price physical sales contract. Certain derivative contracts may be designated as hedges of these risks.

At December 31, 2014, the Company held derivatives for risk management purposes that are expected to settle in the following years:



(Tons in thousands)	2015	2016	Total
Coal sales	4,522	280	4,802
Coal purchases	2,134	—	2,134

Coal trading positions

The Company may sell or purchase forward contracts, swaps and options in the over-the-counter coal market for trading purposes. The Company is exposed to the risk of changes in coal prices on the value of its coal trading portfolio. The unrecognized gains of $3.7 million in the trading portfolio are expected to be realized in 2015.

Tabular derivatives disclosures

The Company has master netting agreements with all of its counterparties which allow for the settlement of contracts in an asset position with contracts in a liability position in the event of default or termination. Such netting arrangements reduce the Company’s credit exposure related to these counterparties. For classification purposes, the Company records the net fair value of all the positions with a given counterparty as a net asset or liability in the consolidated balance sheets. The amounts shown in the table below represent the fair value position of individual contracts, and not the net position presented in the accompanying consolidated balance sheets.

The fair value and location of derivatives reflected in the accompanying consolidated balance sheets are as follows:



	December 31, 2014								December 31, 2013
Fair Value of Derivatives	Asset			Liability					Asset			Liability
(In thousands)	Derivative			Derivative					Derivative			Derivative
Derivatives Designated as Hedging Instruments
Coal	$	6,535		$	(2,492	)			$	909		$	(26	)

Derivatives Not Designated as Hedging Instruments
Heating oil -- diesel purchases	300			—					4,681			—
Heating oil -- fuel surcharges	—			—					422			—
Coal held for trading purposes, exchange traded swaps and futures	96,898			(93,272		)			55,327			(45,763		)
Coal -- risk management	8,510			(3,688		)			6,342			(1,950		)
Total	105,708			(96,960		)			66,772			(47,713		)
Total derivatives	112,243			(99,452		)			67,681			(47,739		)
Effect of counterparty netting	(98,686		)	98,686					(47,727		)	47,727
Net derivatives as classified in the balance sheets	$	13,557		$	(766	)	$	12,791	$	19,954		$	(12	)	$	19,942



		December 31,
		2014			2013
Net derivatives as reflected on the balance sheets
Heating oil	Other current assets	$	300		$	5,103
Coal	Coal derivative assets	13,257			14,851
	Accrued expenses and other current liabilities	(766		)	(12		)
		$	12,791		$	19,942

The Company had a current liability for the obligation to return cash collateral of $2.4 million and a current asset for the right to reclaim cash collateral of $2.2 million at December 31, 2014 and 2013, respectively. These amounts are not included with the derivatives presented in the table above and are included in "other current liabilities" and “other current assets”, respectively, in the accompanying consolidated balance sheets.

The effects of derivatives on measures of financial performance are as follows:

Derivatives used in Cash Flow Hedging Relationships (in thousands)

For the year ended December 31,



		Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion)									Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)
		2014			2013			2012			2014			2013			2012
Coal sales	⁽¹⁾	$	10,842		$	(338	)	7,690			$	5,336		$	3,664		$	2,675
Coal purchases	⁽²⁾	(5,097		)	526			(2,440		)	(2,693		)	(683		)	—
		$	5,745		$	188		$	5,250		$	2,643		$	2,981		$	2,675

No ineffectiveness or amounts excluded from effectiveness testing relating to the Company’s cash flow hedging relationships were recognized in the results of operations in the years ended December 31, 2014, 2013 and 2012.

Derivatives Not Designated as Hedging Instruments (in thousands)

For the year ended December 31,



		Gain (Loss) Recognized
		2014			2013			2012
Coal — unrealized	⁽³⁾	$	430		$	(12,700	)	$	8,272
Coal — realized	⁽⁴⁾	$	5,956		$	32,534		$	43,990
Heating oil — diesel purchases	⁽⁴⁾	$	(7,848	)	$	(9,791	)	$	(22,281	)
Heating oil — fuel surcharges	⁽⁴⁾	$	(405	)	$	(947	)	$	(2,209	)

Location in statement of operations:

(1) — Revenues

(2) — Cost of sales

(3) — Change in fair value of coal derivatives and coal trading activities, net

(4) — Other operating income, net

During the first quarter of 2012, the Company determined that the effectiveness of heating oil options as a hedge for diesel fuel purchases could not be established as of December 31, 2011. As a result, the amount remaining in accumulated other comprehensive income of $8.2 million was recorded in the "Other operating income, net" line in the consolidated statement of operations, or $5.2 million, net of income taxes.

The Company recognized net unrealized and realized gains of $3.2 million, $4.9 million, and $8.3 million during the years ended December 31, 2014, 2013 and 2012, respectively, related to its trading portfolio, which are included in the caption “Change in fair value of coal derivatives and coal trading activities, net” in the accompanying consolidated statements of operations, and are not included in the previous tables reflecting the effects of derivatives on measures of financial performance.

Based on fair values at December 31, 2014, gains on derivative contracts designated as hedge instruments in cash flow hedges of approximately $4.0 million are expected to be reclassified from other comprehensive income into earnings during the next twelve months.

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (SX 210.4-08.(n))
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+ Details

Accrued Expenses and Other Current Liabilities

12 Months Ended

Dec. 31, 2014

Accrued Expenses and Other Current Liabilities [Abstract]

Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consist of the following:



	December 31,
	2014		2013
	(In thousands)
Payroll and employee benefits	$	73,362	$	67,621
Taxes other than income taxes	114,598		114,664
Interest	30,384		18,528
Acquired sales contracts	12,453		14,373
Workers’ compensation	16,714		12,434
Asset retirement obligations	19,222		24,940
Other	35,663		26,027
	$	302,396	$	278,587

Debt and Financing Arrangements

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Debt and Financing Arrangements



	December 31,
	2014		2013
	(In thousands)
Term loan due 2018 ($1.9 billion and $1.93 billion face value, respectively)	$	1,890,846	$	1,906,975
7.00% senior notes due 2019 at par	1,000,000		1,000,000
8.00% senior secured notes due 2019 at par	350,000		350,000
9.875% senior notes ($375.0 million face value) due 2019	363,493		362,358
7.25% senior notes due 2020 at par	500,000		500,000
7.25% senior notes due 2021 at par	1,000,000		1,000,000
Other	56,031		32,162
	5,160,370		5,151,495
Less current maturities of debt	36,885		33,493
Long-term debt	$	5,123,485	$	5,118,002

Credit Facilities

Under the Company's senior secured revolving credit facility, borrowings of up to $250 million bear interest at a floating rate based on LIBOR determined by reference to the Company's leverage ratio, as calculated in accordance with the underlying amended credit agreement. The credit agreement, which also governs its term loan due 2018, was amended in 2013 to decrease the available capacity of the senior secured revolving credit facility from $350 million to the current level. The credit facility expires on June 14, 2016 and is secured by assets pledged by the Company, including equity interests in wholly‑owned subsidiaries, certain real property interests, accounts receivable and inventory of the Company. Commitment fees of 0.50% to 0.75% per annum are payable on the average unused daily balance of the revolving credit facility.

The Company is also party to an accounts receivable securitization program under which eligible trade receivables are sold, without recourse, to a multi‑seller, asset‑backed commercial paper conduit. The entity through which these receivables are sold is consolidated into the Company's financial statements. The Company may borrow and draw letters of credit against the facility, and pays facility fees, program fees and letter of credit fees (based on amounts of outstanding letters of credit). The total aggregate borrowings and letters of credit are limited by eligible accounts receivable, as defined under the terms of the credit facility agreement. The credit agreement expires on December 8, 2017, unless the Company's minimum liquidity, including liquid assets, falls below $550 million.

At December 31, 2014, the available borrowing capacity under the Company's lines of credit was approximately $215.1 million.

Term Loan

On May 16, 2012, the Company borrowed $1.4 billion under a secured term loan facility, issued at a 1% discount. The proceeds from the term loan were used to retire all outstanding borrowings under the revolving credit facility and the outstanding $450.0 million principal amount of 6.75% Senior Notes due 2013 issued by Arch Western Finance, LLC, the Company’s indirect subsidiary. On November 21, 2012, the Company borrowed an incremental $250.0 million on the term loan facility at a 1% discount at the same rate as the initial borrowing. On December 17, 2013 the credit facility amendment increased the maximum amount of term loans allowed under the facility, and the Company borrowed an incremental $300.0 million aggregate principal amount at 98% of the face amount.

The term loan contains no financial maintenance covenants, is prepayable, and is secured by the same assets as borrowings under the revolving credit facility. Quarterly principal payments of $3.5 million began in September 2012, increased to $4.125 million per quarter as a result of the incremental borrowing in November, 2012, and increased further to $4.875 million with the December 17, 2013 borrowing. A balloon payment of $1.8 billion is due in May, 2018. Interest is payable at a rate that is equal to a base of the greater of a LIBOR-based rate and 1.25%, plus 500 basis points.

2019 9.875% Notes

On November 21, 2012, the Company issued $375.0 million aggregate principal amount of 9.875% senior unsecured notes due 2019 (the “2019 9.875% Notes”) at an issue price of 95.934% of the face amount. Interest is payable on the 2019 9.875% Notes annually on June 15 and December 15. The Company may redeem some or all of the notes at prices that are reflected as a percentage of the principal amount, as follows: 104.938% commencing December 15, 2016; 102.469% commencing December 15, 2017; and 100% on or after December 15, 2018.

The unsecured senior notes are guaranteed by substantially all of the Company's subsidiaries, except for Arch Receivable Company, LLC, which is the conduit for the accounts receivable securitization program, and the Company's subsidiaries outside the U.S.

2019 Secured Notes

On December 17, 2013, the Company issued $350.0 million aggregate principal amount of 8.00% senior secured second lien notes due 2019 (the “2019 Secured Notes”) at par. The 2019 Secured Notes are secured by the same assets that secure indebtedness under the senior secured credit facility, but on a second priority basis, subject to certain exceptions and permitted liens. Interest is payable on the 2019 Secured Notes on January 15 and July 15 of each year. The Company may redeem some or all of the notes at prices that are reflected as a percentage of the principal amount, as follows: 104.0% commencing January 15, 2016, 102.0% commencing January 15, 2017, and 100% on or after January 15, 2018.

2020 Notes

The Company has outstanding $500.0 million in aggregate principal amount of 7.25% senior unsecured notes due in 2020 (“2020 Notes”) at par. Interest is payable on the 2020 Notes on April 1 and October 1 of each year. The Company may redeem some or all of the 2020 Notes during the respective 12 month periods at prices that are reflected as a percentage of the principal amount, as follows: 103.625% commencing October 1, 2015; 102.417% commencing October 1, 2016; 101.208% commencing October 1, 2017; and 100% on or after October 1, 2018.

2019 7% Notes and 2021 Notes

The Company has outstanding $1.0 billion of 7.00% unsecured senior notes due 2019 (“2019 7% Notes”) and $1.0 billion of 7.25% unsecured senior notes due 2021 (“2021 Notes”). Interest is payable on the 2019 7% Notes and 2021 Notes on June 15 and December 15 of each year. The Company may redeem some or all of the 2019 7% Notes at prices that are reflected as a percentage of the principal amount, as follows: 103.5% commencing June 15, 2015; 101.75% commencing June 15, 2016; and 100% on or after June 15, 2017. The Company may redeem some or all of the 2021 Notes at prices that are reflected as a percentage of the principal amount, as follows: 103.625% commencing June 15, 2016; 102.417% commencing June 15, 2017; 101.208% commencing June 15, 2018 and 100% on or after June 15, 2019. In each case, accrued and unpaid interest at the redemption date is due upon redemption.

Other Debt Retirements

On December 17, 2013, the Company retired the outstanding $600 million in aggregate principal amount of 8.75% senior unsecured notes due 2016 (“2016 Notes”) for $628.7 million with the proceeds from the incremental term loan and the 2019 Secured Notes.

On May 16, 2012, Arch Western Finance accepted for purchase an aggregate of approximately $304.0 million principal amount of its 6.75% Senior Notes due 2013 for $308.0 million. On May 30, 2012, the remaining notes with an outstanding principal amount of $146.0 million were redeemed at par value.

Debt Maturities

The expected maturities of debt are as follows:



Year
2015	$	36,915
2016	29,875
2017	30,091
2018	1,858,145
2019	1,730,670
Thereafter	1,500,960
	$	5,186,656

Debt Covenants

Financial covenant requirements may restrict the amount of unused capacity available to the Company for borrowings and letters of credit under credit facilities. The credit facility amendment on December 17, 2013 amended financial maintenance covenants to include only a minimum liquidity test until June, 2015, at which time a maximum secured leverage ratio test takes effect. The amendment also limits dividends to one cent per share per fiscal year.

Terms of the Company's credit facilities and leases also contain covenants that limit the ability of the Company to, among other things, acquire, dispose, merge or consolidate assets; incur additional debt; pay dividends and make distributions or repurchase stock; make investments; create liens; issue and sell capital stock of subsidiaries; enter into restrictions affecting the ability of restricted subsidiaries to make distributions, loans or advances to the Company; engage in transactions with affiliates and enter into sale and leaseback transactions. Failure by the Company to comply with such covenants could result in an event of default, which, if not cured or waived, could have a material adverse effect on the Company.

Financing Costs

The Company paid financing costs of $4.5 million, $20.5 million and $50.6 million in conjunction with its financing activities during the years ended December 31, 2014, 2013 and 2012, respectively.

During the years ended December 31, 2013 and 2012, the Company wrote off deferred financing costs of $5.4 million and $1.1 million, respectively, and $6.9 million of unamortized discount and $0.8 million of unamortized issue premium, respectively, related to the redemption of senior notes. In addition, the Company wrote off $1.9 million and $23.4 million of deferred financing costs relating to the reduction in capacity of the senior secured revolving credit facility during the years ended December 31, 2013 and 2012 respectively. The write-off of deferred financing fees, along with other transaction fees associated with these transactions, is reflected in the line "Net loss resulting from early retirement and refinancing of debt " in the consolidated statement of operations.

Taxes

12 Months Ended

Dec. 31, 2014

Taxes [Abstract]

Taxes

The Company is subject to U.S. federal income tax as well as income tax in multiple state jurisdictions. The tax years 2002 through 2014 remain open to examination for U.S. federal income tax matters and 1998 through 2014 remain open to examination for various state income tax matters.

Significant components of the provision for (benefit from) income taxes are as follows:



	Year Ended December 31
	2014		2013			2012
	(In thousands)
Current:
Federal	$	—	$	—		$	(20,022	)
State	25		(647		)	575
Total current	25		(647		)	(19,447		)
Deferred:
Federal	18,535		(318,956		)	(341,486		)
State	7,074		(15,895		)	7,026
Total deferred	25,609		(334,851		)	(334,460		)
	$	25,634	$	(335,498	)	$	(353,907	)

A reconciliation of the statutory federal income tax provision (benefit) at the statutory rate to the actual provision for (benefit from) income taxes follows:



	Year Ended December 31
	2014			2013			2012
	(In thousands)
Income tax provision (benefit) at statutory rate	$	(186,452	)	$	(378,463	)	$	(382,581	)
Percentage depletion allowance	(12,692		)	(15,796		)	(33,654		)
Goodwill	—			70,301			56,916
State taxes, net of effect of federal taxes	(3,903		)	(25,265		)	(24,231		)
Change in valuation allowance	226,929			8,659			31,832
Other, net	1,752			5,066			(2,189		)
	$	25,634		$	(335,498	)	$	(353,907	)

In 2014, 2013 and 2012, compensatory stock options and other equity based compensation awards were exercised resulting in a tax expense (benefit) of $1.6 million, $1.5 million and $0.3 million, respectively. The tax benefit will be recorded in paid-in capital at such point in time when a cash tax benefit is recognized.

Significant components of the Company's deferred tax assets and liabilities that result from carryforwards and temporary differences between the financial statement basis and tax basis of assets and liabilities are summarized as follows:



	December 31,
	2014			2013
	(In thousands)
Deferred tax assets:
Net operating loss carryforwards	$	871,848		$	660,916
Alternative minimum tax credit carryforwards	127,169			126,755
Reclamation and mine closure	114,430			113,843
Goodwill	50,072			52,636
Workers' compensation	38,924			31,641
Share based compensation	30,283			28,494
Acquired sales contracts	26,833			33,392
Retiree benefit plans	22,913			20,527
Contract obligations	15,693			19,327
Other, primarily accrued liabilities	64,503			68,969
Gross deferred tax assets	1,362,668			1,156,500
Valuation allowance	(270,251		)	(43,322		)
Total deferred tax assets	1,092,417			1,113,178
Deferred tax liabilities:
Plant and equipment	1,354,396			1,364,382
Deferred development	95,129			91,126
Investment in tax partnerships	7,377			8,170
Other	5,533			13,902
Total deferred tax liabilities	1,462,435			1,477,580
Net deferred liability	370,018			364,402

The Company has federal net operating loss carryforwards for regular income tax purposes of $2.4 billion at December 31, 2014 that will expire between 2022 and 2034. The Company has an alternative minimum tax credit carryforward of $127.2 million at December 31, 2014, which has no expiration date and can be used to offset future regular tax in excess of the alternative minimum tax.

The Company recorded increases in its valuation allowance against its deferred tax assets of $226.9 million, $8.7 million and $31.8 million in 2014, 2013 and 2012, respectively. In 2014, the Company determined that it would not realize the all of the benefit from federal and state net operating losses, based on projections of reversing timing differences in the future. Adjustments in 2013 and 2012 relate to certain state and foreign net operating loss benefits.

A reconciliation of the beginning and ending amounts of gross unrecognized tax benefits follows:



		(In thousands)
Balance at	January 1, 2012	$	8,798
Additions based on tax positions related to the current year		409
Additions for tax positions of prior years		21,943
Balance at	December 31, 2012	31,150
Additions based on tax positions related to the current year		1,199
Additions for tax positions of prior years		688
Reductions as a result of lapses in the statute of limitations		(1,248		)
Balance at	December 31, 2013	31,789
Additions for tax positions of the current year		2,920
Balance at	December 31, 2014	$	34,709

If recognized, the entire amount of the gross unrecognized tax benefits at December 31, 2014 would affect the effective tax rate.

The Company recognizes interest and penalties related to unrecognized tax benefits in income tax expense. The Company had accrued interest and penalties of $1.5 million and $1.3 million at December 31, 2014 and 2013, respectively. In the next 12 months, no gross unrecognized tax benefits are expected to be reduced due to the expiration of the statute of limitations.

Asset Retirement Obligations

12 Months Ended

Dec. 31, 2014

Asset Retirement Obligation [Abstract]

Asset Retirement Obligations

The Company's asset retirement obligations arise from the Federal Surface Mining Control and Reclamation Act of 1977 and similar state statutes, which require that mine property be restored in accordance with specified standards and an approved reclamation plan. The required reclamation activities to be performed are outlined in the Company's mining permits. These activities include reclaiming the pit and support acreage at surface mines, sealing portals at underground mines, and reclaiming refuse areas and slurry ponds.

The following table describes the changes to the Company's asset retirement obligation liability:



	Year Ended December 31,
	2014			2013
	(In thousands)
Balance at January 1 (including current portion)	$	427,653		$	448,625
Accretion expense	32,909			35,727
Obligations of divested operations	(30,684		)	(8,440		)
Adjustments to the liability from changes in estimates	627			(26,578		)
Liabilities settled	(12,387		)	(21,681		)
Balance at December 31	$	418,118		$	427,653
Current portion included in accrued expenses	(19,222		)	(24,940		)
Noncurrent liability	$	398,896		$	402,713

As of December 31, 2014, the Company had $177.7 million in surety bonds outstanding, $458.5 million in self-bonding, and $3.5 million in letters of credit to secure reclamation bonding obligations.

Fair Value Measurements

12 Months Ended

Dec. 31, 2014

Fair Value Disclosures [Abstract]

Fair Value Measurements

The hierarchy of fair value measurements assigns a level to fair value measurements based on the inputs used in the respective valuation techniques. The levels of the hierarchy, as defined below, give the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs.

· Level 1 is defined as observable inputs such as quoted prices in active markets for identical assets. Level 1 assets include available-for-sale equity securities, U.S. Treasury securities, and coal swaps and futures that are submitted for clearing on the New York Mercantile Exchange.

· Level 2 is defined as observable inputs other than Level 1 prices. These include quoted prices for similar assets or liabilities in an active market, quoted prices for identical assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. The Company’s level 2 assets and liabilities include U.S. government agency securities and coal commodity contracts with fair values derived from quoted prices in over-the-counter markets or from prices received from direct broker quotes.

· Level 3 is defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. These include the Company’s commodity option contracts (coal and heating oil) valued using modeling techniques, such as Black-Scholes, that require the use of inputs, particularly volatility, that are rarely observable. Changes in the unobservable inputs would not have had a significant impact on the reported Level 3 fair values at December 31, 2014 and 2013.

The table below sets forth, by level, the Company’s financial assets and liabilities that are recorded at fair value in the accompanying consolidated balance sheet:



	Fair Value at				December 31, 2014
	Total		Level 1			Level 2		Level 3
	(In thousands)
Assets:
Investments in marketable securities	$	254,099	$	5,145		$	248,954	$	—
Derivatives	13,557		9,026			1,491		3,040
Total assets	$	267,656	$	14,171		$	250,445	$	3,040
Liabilities:
Derivatives	$	766	$	—		$	766	$	—



	Fair Value at				December 31, 2013
	Total		Level 1			Level 2			Level 3
	(In thousands)
Assets:
Investments in marketable securities	$	264,443	$	77,967		$	186,476		$	—
Derivatives	19,954		14,847			—			5,107
Total assets	$	284,397	$	92,814		$	186,476		$	5,107
Liabilities:
Derivatives	$	12	$	—		$	(149	)	$	161

The Company’s contracts with its counterparties allow for the settlement of contracts in an asset position with contracts in a liability position in the event of default or termination. For classification purposes, the Company records the net fair value of all the positions with these counterparties as a net asset or liability. Each level in the table above displays the underlying contracts according to their classification in the accompanying consolidated balance sheet, based on this counterparty netting.

The following table summarizes the change in the fair values of financial instruments categorized as level 3.



	Year Ended December 31,
	2014			2013
	(In thousands)
Balance, beginning of period	$	4,946		$	8,174
Realized and unrealized losses recognized in earnings, net	(6,572		)	(10,253		)
Purchases	5,288			8,654
Issuances	(622		)	(25		)
Settlements	—			(1,604		)
Ending balance	$	3,040		$	4,946

Net unrealized losses of $2.1 million were recognized during the year ended December 31, 2014 related to level 3 financial instruments held on December 31, 2014.

Cash and Cash Equivalents

At December 31, 2014 and 2013, the carrying amounts of cash and cash equivalents approximate their fair value.

Fair Value of Long-Term Debt

At December 31, 2014 and 2013, the fair value of the Company’s debt, including amounts classified as current, was $2.7 billion and $4.6 billion, respectively. Fair values are based upon observed prices in an active market, when available, or from valuation models using market information, which fall into Level 2 in the fair value hierarchy.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Capital Stock	12 Months Ended
Capital Stock	Dec. 31, 2014
Capital Stock [Abstract]
Capital Stock	Capital Stock On March 1, 2012, the Company filed a registration statement on Form S-3 with the SEC. The registration statement allows the Company to offer, from time to time, an unlimited amount of debt securities, preferred stock, depositary shares, purchase contracts, purchase units, common stock and related rights and warrants. Stock Repurchase Plan The Company's share repurchase program allows for the purchase of up to 14,000,000 shares of the Company's common stock. At December 31, 2014, 10,925,800 shares of common stock were available for repurchase under the plan. There is no expiration date on the program. Any future repurchases under the plan will be made at management's discretion and will depend on market conditions and other factors.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 4.E)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph d
-Article 4

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

Stock-Based Compensation and Other Incentive Plans

12 Months Ended

Dec. 31, 2014

Share-based Compensation [Abstract]

Stock-Based Compensation And Other Incentive Plans

Stock-Based Compensation and Other Incentive Plans

Under the Company's Stock Incentive Plan (the "Incentive Plan"), 30.9 million shares of the Company's common stock were reserved for awards to officers and other selected key management employees of the Company. The Incentive Plan provides the Board of Directors with the flexibility to grant stock options, stock appreciation rights, restricted stock awards, restricted stock units, performance stock or units, merit awards, phantom stock awards and rights to acquire stock through purchase under a stock purchase program ("Awards"). Awards the Board of Directors elects to pay out in cash do not impact the shares authorized in the Incentive Plan. Shares available for award under the plan were 10.3 million at December 31, 2014.

Stock Options

Stock options are granted at a strike price equal to the closing market price of the Company's common stock on the date of grant and are generally subject to vesting provisions of at least one year from the date of grant. Information regarding stock option activity under the Incentive Plan follows for the year ended December 31, 2014:



			Weighted Average		Aggregate		Average
	Common		Exercise		Intrinsic		Remaining
	Shares		Price		Value		Life
	(In thousands)						(years)
Options outstanding at January 1	6,939		$	19.86
Canceled	(88	)	$	17.61
Expired	(29	)	$	29.84
Options outstanding at December 31	6,822		$	19.84	$	—	5.68
Options exercisable at December 31	5,123		$	24.01	—		5.01
Unvested options at December 31	1,699

The remaining unvested options have a weighted average fair value of $3.10 per share.

The total grant-date fair value of options vested during the years ended December 31, 2014, 2013 and 2012 was $8.7 million, $8.9 million and $8.0 million, respectively. The options provide for the continuation of vesting for retirement-eligible recipients that meet certain criteria. The expense for these options is recognized through the date that the employee first becomes eligible to retire and is no longer required to provide service to earn part or all of the award. Compensation expense related to stock options for the years ended December 31, 2014, 2013 and 2012 was $3.2 million, $6.7 million and $8.0 million, respectively. Unrecognized compensation cost related to the unvested stock options of $1.6 million at December 31, 2014 will be recognized in 2015.The majority of the cost relating to the stock-based compensation plans is included in "Selling, general and administrative expenses" in the accompanying consolidated statements of operations.

Weighted average assumptions used in the Black-Scholes option pricing model for granted options follow:



	Year Ended December 31,
	2013		2012
Weighted average grant-date fair value per share of options granted	$	2.37	$	5.27
Assumptions (weighted average):
Risk-free interest rate	0.65%		0.76%
Expected dividend yield	2.30%		2.92%
Expected volatility	66.7%		60.7%
Expected life (in years)	4.5		4.5

Expected volatilities are based on historical stock price movement and implied volatility from traded options on the Company's stock. The expected life of options is determined based on historical exercise activity.

Restricted Stock and Restricted Stock Unit Awards

The Company may issue restricted stock and restricted stock units, which require no payment from the employee. Restricted stock cliff-vests at various dates and restricted stock units either vest ratably over or vest at the end of three years. Compensation expense is based on the fair value on the grant date and is recorded ratably over the vesting period. The employee receives cash compensation equal to the amount of dividends that would have been paid on the underlying shares.

Information regarding restricted stock and restricted stock unit activity and weighted average grant-date fair value follows for the year ended December 31, 2014:



	Restricted Stock				Restricted Stock Units
			Weighted Average				Weighted Average
	Common		Grant-Date		Common		Grant-Date
	Shares		Fair Value		Shares		Fair Value
	(In thousands)				(In thousands)
Outstanding at January 1	143		$	27.52	1,373		$	7.95
Granted	—		—		1,521		4.51
Vested	(120	)	30.08		—		—
Canceled	(1	)	32.49		(70	)	6.34
Outstanding at December 31	22		13.44		2,824		6.14

The Company's recognized expense related to restricted stock and restricted stock units was $5.6 million, $5.0 million, and $3.5 million for the years ended December 31, 2014, 2013 and 2012, respectively

Long-Term Incentive Compensation

The Company has a long-term incentive program that allows for the award of performance units. The total number of units earned by a participant is based on financial and operational performance measures, and may be paid out in cash or in shares of the Company's common stock. The Company recognizes compensation expense over the three year term of the grant. The liabilities are remeasured quarterly. The Company recognized $10.1 million, $9.1 million and $8.1 million for the years ended December 31, 2014, 2013 and 2012, respectively. The expense is included primarily in "Selling, general and administrative expenses" in the accompanying consolidated statements of operations. Amounts accrued and unpaid for all grants under the plan totaled $21.1 million and $17.2 million as of December 31, 2014 and 2013, respectively.

Deferred Compensation Plan

The Company maintains a deferred compensation plan that allows eligible employees to defer receipt of compensation until the dates elected by the participant. Participants in the plan may defer up to 85% of their base salaries and up to 100% of their annual incentive awards. The plan also allows participants to defer receipt of up to 100% of the shares under any restricted stock unit or performance-contingent stock awards. The amounts deferred are invested in accounts that mirror the gains and losses of a number of different investment funds, including a hypothetical investment in shares of the Company's common stock. Participants are always vested in their deferrals to the plan and any related earnings. The Company has established a grantor trust to fund the obligations under the plan. The trust has purchased corporate-owned life insurance to offset these obligations. The net cash surrender values of the policies of $37.6 million and $39.4 million at December 31, 2014 and 2013 , respectively, are included in "Other noncurrent assets" in the accompanying consolidated balance sheets. The participants have an unsecured contractual commitment by the Company to pay the amounts due under the plan. Any assets placed in trust by the Company to fund future obligations of the plan are subject to the claims of creditors in the event of insolvency or bankruptcy, and participants are general creditors of the company as to their deferred compensation in the plans.

Under the plan, the Company credits each participant's account with the number of units equal to the number of shares or units that the participant could purchase or receive with the amount of compensation deferred, based upon the fair market value of the underlying investment on that date. The amount the employee will receive from the plan will be based on the number of units credited to each participant's account, valued on the basis of the fair market value of an equivalent number of shares or units of the underlying investment on that date. The liability under the plan was $35.1 million and $37.0 million at December 31, 2014 and 2013.

The Company's net income related to the deferred compensation plan for the years ended December 31, 2014, 2013 and 2012 was $1.6 million, $2.6 million and $3.3 million, respectively, most of which is included in "Selling, general and administrative expenses in the accompanying consolidated statements of operations.

Workers' Compensation Expense

12 Months Ended

Dec. 31, 2014

Workers' Compensation Expense [Abstract]

Workers' Compensation Expense

Workers’ Compensation Expense

The following table details the components of workers’ compensation expense:



		Year Ended December 31,
		2014		2013		2012
	(In thousands)
Total occupational disease		4,432		6,137		6,962
Traumatic injury claims and assessments		19,924		21,089		26,565
Total workers’ compensation expense		$	24,356	$	27,226	$	33,527

Summarized below is information about the amounts recognized in the accompanying consolidated balance sheets for workers' compensation benefits:



	December 31,
	2014		2013
	(In thousands)
Occupational disease costs	$	72,749	$	55,228
Traumatic and other workers' compensation claims	38,256		35,268
Total obligations	111,005		90,496
Less amount included in accrued expenses	16,714		12,434
Noncurrent obligations	$	94,291	$	78,062

As of December 31, 2014, the Company had $121.4 million in surety bonds and letters of credit outstanding to secure workers' compensation obligations.

Employee Benefit Plans

12 Months Ended

Dec. 31, 2014

Pension and Other Postretirement Benefit Expense [Abstract]

Employee Benefit Plans

Defined Benefit Pension and Other Postretirement Benefit Plans

The Company provides funded and unfunded non-contributory defined benefit pension plans covering certain of its salaried and hourly employees. Benefits are generally based on the employee's age and compensation. The Company funds the plans in an amount not less than the minimum statutory funding requirements or more than the maximum amount that can be deducted for U.S. federal income tax purposes.

The Company also currently provides certain postretirement medical and life insurance coverage for eligible employees. Generally, covered employees who terminate employment after meeting eligibility requirements are eligible for postretirement coverage for themselves and their dependents. The salaried employee postretirement benefit plans are contributory, with retiree contributions adjusted annually, and contain other cost-sharing features such as deductibles and coinsurance. The Company's current funding policy is to fund the cost of all postretirement benefits as they are paid.

The idling of the Cumberland River mining operations in Appalachia in the third quarter of 2014 reduced the estimated years of future service for the CRCC Scotia Employee Association Pension Plan. On January 1, 2015, the Company's cash balance and excess plans were amended to freeze benefits at the amount accrued at that date. These two events triggered curtailment accounting, resulting in an immediate recognition of any unamortized gain or loss and the reduction in the projected benefit obligation.

A curtailment was triggered in the third quarter of 2013 by reductions in employees' expected years of future service resulting primarily from the sale of Canyon Fuel.

Obligations and Funded Status.

Summaries of the changes in the benefit obligations, plan assets and funded status of the plans are as follows:



							Other Postretirement
	Pension Benefits						Benefits
	2014			2013			2014			2013
	(In thousands)
CHANGE IN BENEFIT OBLIGATIONS
Benefit obligations at January 1	$	355,468		$	390,894		$	42,531		$	49,326
Service cost	21,478			27,065			1,649			2,027
Interest cost	17,070			16,207			1,841			1,739
Plan amendments	(23		)	—			—			—
Curtailments	(25,787		)	(3,027		)	—			(2,519		)
Benefits paid	(53,974		)	(41,562		)	(3,431		)	(3,276		)
Other-primarily actuarial loss (gain)	39,504			(34,109		)	(6,492		)	(4,766		)
Benefit obligations at December 31	$	353,736		$	355,468		$	36,098		$	42,531
CHANGE IN PLAN ASSETS
Value of plan assets at January 1	$	347,952		$	322,874		$	—		$	—
Actual return on plan assets	36,130			52,247			—			—
Employer contributions	6,601			14,393			3,431			3,276
Benefits paid	(53,974		)	(41,562		)	(3,431		)	(3,276		)
Value of plan assets at December 31	$	336,709		$	347,952		$	—		$	—
Accrued benefit cost	$	(17,027	)	$	(7,516	)	$	(36,098	)	$	(42,531	)
ITEMS NOT YET RECOGNIZED AS A COMPONENT OF NET PERIODIC BENEFIT COST
Prior service credit (cost)	$	—		$	1,732		$	21,972		$	31,925
Accumulated gain (loss)	(11,332		)	10,096			9,125			3,394
	$	(11,332	)	$	11,828		$	31,097		$	35,319
BALANCE SHEET AMOUNTS
Current liability	$	(767	)	$	(405	)	$	(3,430	)	$	(3,276	)
Noncurrent liability	$	(16,260	)	$	(7,111	)	$	(32,668	)	$	(39,255	)
	$	(17,027	)	$	(7,516	)	$	(36,098	)	$	(42,531	)

Pension Benefits

The accumulated benefit obligation for all pension plans was $353.7 million and $341.1 million at December 31, 2014 and 2013, respectively. The accumulated benefit obligation differs from the benefit obligation in that it includes no assumptions about future compensation levels.

Net actuarial loss of $8.2 million will be amortized from accumulated other comprehensive income into net periodic benefit cost in 2015.

Other Postretirement Benefits

Prior service credit and net actuarial gain of $8.3 million and $1.8 million, respectively, will be amortized from accumulated other comprehensive income into net periodic benefit cost in 2015.

Components of Net Periodic Benefit Cost. The following table details the components of pension and postretirement benefit costs (credits):



	Pension Benefits									Other Postretirement Benefits
	Year Ended December 31,									Year Ended December 31,
	2014			2013			2012			2014			2013			2012
	(In thousands)
Service cost	$	21,478		$	27,065		$	27,466		$	1,649		$	2,027		$	2,142
Interest cost	17,070			16,207			15,668			1,841			1,739			2,020
Curtailments	(25,368		)	47			324			—			(5,444		)	(4,049		)
Settlements	646			—			—			—			—			—
Expected return on plan assets	(23,756		)	(23,761		)	(22,030		)	—			—			—
Amortization of prior service credits	(257		)	(204		)	259			(10,003		)	(10,621		)	(11,458		)
Amortization of other actuarial losses	3,128			14,616			14,666			(761		)	(252		)	(522		)
Net benefit cost (credit)	$	(7,059	)	$	33,970		$	36,353		$	(7,274	)	$	(12,551	)	$	(11,867	)

The differences generated from changes in assumed discount rates and returns on plan assets are amortized into earnings over a five-year period.

Assumptions. The following table provides the weighted average assumptions used to determine the actuarial present value of projected benefit obligations at December 31 of the respective years.



	Pension Benefits		Other Postretirement Benefits
	2014	2013	2014	2013

Discount rate	4.15%	5.08%	3.91%	4.58%
Rate of compensation increase	N/A	3.39%	N/A	N/A

The following table provides the weighted average assumptions used to determine net periodic benefit cost for the respective years ended December 31.



	Pension Benefits							Other Postretirement Benefits
	2014			2013			2012	2014	2013		2012

Discount rate	5.08/	4.23/	4.14%	4.13	/	5.05%	4.91%	4.58%	3.64/	4.58%	4.52%
Rate of compensation increase	3.39%			3.39%			3.39%	N/A	N/A		N/A
Expected return on plan assets	7.75%			7.75%			7.75%	N/A	N/A		N/A

The discount rates used in 2014 and 2013 were reevaluated during the year for settlements and the curtailments settlements as described previously. The obligations are remeasured at an updated discount rate that impacts the benefit cost recognized subsequent to the remeasurement.

The Company establishes the expected long-term rate of return at the beginning of each fiscal year based upon historical returns and projected returns on the underlying mix of invested assets. The Company utilizes modern portfolio theory modeling techniques in the development of its return assumptions. This technique projects rates of return that can be generated through various asset allocations that lie within the risk tolerance set forth by members of the Company's pension committee (the "Pension Committee"). The risk assessment provides a link between a pension plan's risk capacity, management's willingness to accept investment risk and the asset allocation process, which ultimately leads to the return generated by the invested assets.

The health care cost trend rate assumed for 2015 is 7.1% and is expected to reach an ultimate trend rate of 4.5% by 2028. A one-percentage-point increase in the health care cost trend rate would not have increased the postretirement benefit obligation at December 31, 2014 or the net periodic postretirement benefit cost for the year ended December 31, 2014 by a material amount.

Plan Assets

The Pension Committee is responsible for overseeing the investment of pension plan assets. The Pension Committee is responsible for determining and monitoring appropriate asset allocations and for selecting or replacing investment managers, trustees and custodians. The pension plan's current investment targets are 65% equity and 35% fixed income securities. The Pension Committee reviews the actual asset allocation in light of these targets on a periodic basis and rebalances among investments as necessary. The Pension Committee evaluates the performance of investment managers as compared to the performance of specified benchmarks and peers and monitors the investment managers to ensure adherence to their stated investment style and to the plan's investment guidelines.

The Company's pension plan assets at December 31, 2014 and 2013, respectively, are categorized below according to the fair value hierarchy as defined in Note 16, "Fair Value Measurements":



	Total				Level 1				Level 2				Level 3
	2014		2013		2014		2013		2014		2013		2014		2013
	(In thousands)
Equity Securities:^(A)
U.S. small-cap	$	16,512	$	14,901	$	16,512	$	14,901	$	—	$	—	$	—	$	—
U.S. mid-cap	46,481		62,271		17,301		28,654		29,180		33,617		—		—
U.S. large-cap	89,008		110,947		43,181		53,708		45,827		57,239		—		—
Non-U.S.	25,905		29,165		—		—		25,905		29,165		—		—
Fixed income securities:
U.S. government securities^(B)	13,708		18,545		12,988		17,714		720		831		—		—
Non-U.S. government securities^(C)	1,599		2,143		—		—		1,599		2,143		—		—
U.S. government asset and mortgage backed securities^(D)	830		600		—		—		830		600		—		—
Corporate fixed income^(E)	22,702		9,902		—		—		22,702		9,902		—		—
State and local government securities^(F)	8,005		8,301		—		—		8,005		8,301		—		—
Other fixed income^(G)	83,735		58,093		—		—		83,735		58,093		—		—
Short-term investments^(H)	6,818		14,663		—		—		6,818		14,663		—		—
Other investments^(I)	21,406		18,421		—		—		3,336		1,404		18,070		17,017
Total	$	336,709	$	347,952	$	89,982	$	114,977	$	228,657	$	215,958	$	18,070	$	17,017

^(A) Equity securities includes investments in 1) common stock, 2) preferred stock and 3) mutual funds. Investments in common and preferred stocks are valued using quoted market prices multiplied by the number of shares owned. Investments in mutual funds are valued at the net asset value per share multiplied by the number of shares held as of the measurement date and are traded on listed exchanges.

^(B)U.S. government securities includes agency and treasury debt. These investments are valued using dealer quotes in an active market.

^(C) Non-U.S. government securities includes debt securities issued by foreign governments and are valued utilizing a price spread basis valuation technique with observable sources from investment dealers and research vendors.

^(D) U.S. government asset and mortgage backed securities includes government-backed mortgage funds which are valued utilizing an income approach that includes various valuation techniques and sources such as discounted cash flows models, benchmark yields and securities, reported trades, issuer trades and/or other applicable data.

^(E) Corporate fixed income is primarily comprised of corporate bonds and certain corporate asset-backed securities that are denominated in the U.S. dollar and are investment-grade securities. These investments are valued using dealer quotes.

^(F) State and local government securities include different U.S. state and local municipal bonds and asset backed securities, these investments are valued utilizing a market approach that includes various valuation techniques and sources such as value generation models, broker quotes, benchmark yields and securities, reported trades, issuer trades and/or other applicable data.

^(G) Other fixed income investments are actively managed fixed income vehicles that are valued at the net asset value per share multiplied by the number of shares held as of the measurement date.

^(H) Short-term investments include governmental agency funds, government repurchase agreements, commingled funds, and pooled funds and mutual funds. Governmental agency funds are valued utilizing an option adjusted spread valuation technique and sources such as interest rate generation processes, benchmark yields and broker quotes. Investments in governmental repurchase agreements, commingled funds and pooled funds and mutual funds are valued at the net asset value per share multiplied by the number of shares held as of the measurement date.

(I) Other investments includes cash, forward contracts, derivative instruments, credit default swaps, interest rate swaps and mutual funds. Investments in interest rate swaps are valued utilizing a market approach that includes various valuation techniques and sources such as value generation models, broker quotes in active and non-active markets, benchmark yields and securities, reported trades, issuer trades and/or other applicable data. Forward contracts and derivative instruments are valued at their exchange listed price or broker quote in an active market. The mutual funds are valued at the net asset value per share multiplied by the number of shares held as of the measurement date and are traded on listed exchanges.

During 2013, the plan invested $16.0 million in Level 3 investments. Subsequent changes in fair value are the result of unrealized gains on the investment.

Cash Flows. The Company expects to make contributions of $0.5 million to the pension plans in 2015, which is impacted by the Moving Ahead for Progress in the 21st Century Act (MAP-21). MAP-21 does not reduce the Company's obligations under the plan, but redistributes the timing of required payments by providing near term funding relief for sponsors under the Pension Protection Act.

The following represents expected future benefit payments from the plan, which reflect expected future service, as appropriate:



			Other
	Pension		Postretirement
	Benefits		Benefits
	(In thousands)
2015	$	17,737	$	3,665
2016	20,544		3,657
2017	22,503		3,551
2018	24,086		3,486
2019	22,943		3,421
Next 5 years	130,088		14,680
	$	237,901	$	32,460

Other Plans

The Company sponsors savings plans which were established to assist eligible employees provide for their future retirement needs. The Company's expense, representing its contributions to the plans, was $22.9 million, $25.1 million and $27.2 million for the years ended December 31, 2014, 2013 and 2012, respectively.

Earnings (Loss) Per Common Share	12 Months Ended
Earnings (Loss) Per Common Share	Dec. 31, 2014
Earnings Per Share [Abstract]
Earnings (Loss) Per Common Share	Earnings (Loss) Per Common Share The effect of options, restricted stock and restricted stock units representing 7.7 million , 7.5 million, and 4.9 million shares of common stock were excluded from the calculation of diluted weighted average shares outstanding for the years ended December 31, 2014, 2013 and 2012, respectively because the exercise price or grant price of the securities exceeded the average market price of the Company's common stock for these periods. The effect of options, restricted stock and restricted stock units representing 2.0 million shares were excluded from the calculation of weighted average shares due to the Company's incurring a net loss for the years ended December 31, 2014.

Leases

12 Months Ended

Dec. 31, 2014

Leases [Abstract]

Leases

The Company leases equipment, land and various other properties under non-cancelable long-term leases, expiring at various dates. Certain leases contain options that would allow the Company to extend the lease or purchase the leased asset at the end of the base lease term.

In addition, the Company enters into various non-cancelable royalty lease agreements under which future minimum payments are due.

Minimum payments due in future years under these agreements in effect at December 31, 2014 are as follows:



	Operating
	Leases		Royalties
	(In thousands)
2015	$	25,685	$	14,587
2016	19,242		18,632
2017	17,065		17,932
2018	6,334		17,584
2019	3,370		13,875
Thereafter	11,880		83,282
	$	83,576	$	165,892

Obligations for the future minimum payments under capital leases for equipment totaling $46.0. million and $20.8. million at December 31, 2014 and 2013, respectively, are included in other long term debt obligations in Note 13. "Debt and Financing Arrangements".

Rental expense, including amounts related to these operating leases and other shorter-term arrangements, amounted to $42.9 million in 2014, $42.2 million in 2013 and $41.2 million in 2012.

Royalties are paid to lessors either as a fixed price per ton or as a percentage of the gross selling price of the mined coal. Royalties under the majority of the Company's significant leases are paid on the percentage of gross selling price basis. Royalty expense, including production royalties, was $242.5 million in 2014, $261.1 million in 2013 and $302.0 million in 2012.

As of December 31, 2014, certain of the Company's lease obligations were secured by outstanding surety bonds totaling $49.4 million.

Risk Concentrations

12 Months Ended

Dec. 31, 2014

Risks Concentrations [Abstract]

Risk Concentrations

Credit Risk and Major Customers

The Company has a formal written credit policy that establishes procedures to determine creditworthiness and credit limits for trade customers and counterparties in the over-the-counter coal market. Generally, credit is extended based on an evaluation of the customer's financial condition. Collateral is not generally required, unless credit cannot be established. Credit losses are provided for in the financial statements and historically have been minimal.

The Company markets its steam coal principally to domestic and foreign electric utilities and its metallurgical coal to domestic and foreign steel producers. As of December 31, 2014 and 2013, accounts receivable from electric utilities of $134.7 million and $125.7 million, respectively, represented 64% of total trade receivables at each date. As of December 31, 2014 and 2013, accounts receivable from sales of metallurgical-quality coal of $76.0 million and $70.5 million, respectively, represented 36% of total trade receivables at each date.

The Company uses shipping destination as the basis for attributing revenue to individual countries. Because title may transfer on brokered transactions at a point that does not reflect the end usage point, they are reflected as exports, and attributed to an end delivery point if that knowledge is known to the Company. The Company's foreign revenues by geographical location are as follows:



	Year Ended December 31,
	2014		2013		2012
	(In thousands)
Europe	$	277,565	$	371,363	$	674,754
Asia	156,057		160,404		203,193
North America	78,445		80,322		72,542
Central and South America	20,496		55,493		57,184
Brokered Sales	79,354		154,442		145,438
Total	$	611,917	$	822,024	$	1,153,111

The Company is committed under long-term contracts to supply steam coal that meets certain quality requirements at specified prices. These prices are generally adjusted based on market indices. Quantities sold under some of these contracts may vary from year to year within certain limits at the option of the customer. The Company sold approximately 134.4 million tons of coal in 2014. Approximately 60% of this tonnage (representing approximately 48% of the Company's revenues) was sold under long-term contracts (contracts having a term of greater than one year). Long-term contracts range in remaining life from one to six years.

Third-party sources of coal

The Company uses independent contractors to mine coal at certain mining complexes. The Company also purchases coal from third parties that it sells to customers. Factors beyond the Company's control could affect the availability of coal produced for or purchased by the Company. Disruptions in the quantities of coal produced for or purchased by the Company could impair its ability to fill customer orders or require it to purchase coal from other sources at prevailing market prices in order to satisfy those orders.

Transportation

The Company depends upon barge, rail, truck and belt transportation systems to deliver coal to its customers. Disruption of these transportation services due to weather-related problems, mechanical difficulties, strikes, lockouts, bottlenecks, and other events could temporarily impair the Company's ability to supply coal to its customers In the past, disruptions in rail service have resulted in missed shipments and production interruptions.

Settlement with Patriot Coal	12 Months Ended
Settlement with Patriot Coal	Dec. 31, 2014
Settlement with Patriot Coal [Abstract]
Settlement with Patriot Coal	Settlement with Patriot Coal On December 31, 2005, Arch entered into a purchase and sale agreement to sell mining complexes to Magnum Coal Company ("Magnum"). On July 23, 2008, Patriot Coal Corporation acquired Magnum from Arc Light Capital Partners. On July 9, 2012, Patriot Coal Corporation and certain of its wholly owned subsidiaries, including Magnum, (collectively, "Patriot") filed voluntary petitions for reorganization under Chapter 11 of the U.S. Code in the U.S. Bankruptcy Court for the Southern District of New York. On October 4, 2013, we entered into a term sheet that was approved by the U.S. Bankruptcy Court on November 7, 2013, that resolves all pending and potential legal claims with Patriot stemming from the Company's sale of mining complexes to Magnum and the subsequent purchase of those companies by Patriot in 2008. The Company paid $5.0 million in cash to Patriot upon its exit from bankruptcy, which is reflected in "Other operating income, net" in the consolidated statement of operations for the year ended December 31, 2013.

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The Company accrues for cost related to contingencies when a loss is probable and the amount is reasonably determinable. Disclosure of contingencies is included in the financial statements when it is at least reasonably possible that a material loss or an additional material loss in excess of amounts already accrued may be incurred. Allegheny Energy Supply (“Allegheny”), the sole customer of coal produced at the Company's subsidiary Wolf Run Mining Company's (“Wolf Run”) Sycamore No. 2 mine, filed a lawsuit against Wolf Run, Hunter Ridge Holdings, Inc. (“Hunter Ridge”), and ICG in state court in Allegheny County, Pennsylvania on December 28, 2006, and amended its complaint on April 23, 2007. Allegheny claimed that Wolf Run breached a coal supply contract when it declared force majeure under the contract upon idling the Sycamore No. 2 mine in the third quarter of 2006, and that Wolf Run continued to breach the contract by failing to ship in volumes referenced in the contract. The Sycamore No. 2 mine was idled after encountering adverse geologic conditions and abandoned gas wells that were previously unidentified and unmapped. After extensive searching for gas wells and rehabilitation of the mine, it was re-opened in 2007, but with notice to Allegheny that it would necessarily operate at reduced volumes in order to safely and effectively avoid the many gas wells within the reserve. The amended complaint also alleged that the production stoppages constitute a breach of the guarantee agreement by Hunter Ridge and breach of certain representations made upon entering into the contract in early 2005. Allegheny voluntarily dropped the breach of representation claims later. Allegheny claimed that it would incur costs in excess of $100 million to purchase replacement coal over the life of the contract. ICG, Wolf Run and Hunter Ridge answered the amended complaint on August 13, 2007, disputing all of the remaining claims. On November 3, 2008, ICG, Wolf Run and Hunter Ridge filed an amended answer and counterclaim against the plaintiffs seeking to void the coal supply agreement due to, among other things, fraudulent inducement and conspiracy. On September 23, 2009, Allegheny filed a second amended complaint alleging several alternative theories of liability in its effort to extend contractual liability to ICG, which was not a party to the original contract and did not exist at the time Wolf Run and Allegheny entered into the contract. No new substantive claims were asserted. ICG answered the second amended complaint on October 13, 2009, denying all of the new claims. The Company's counterclaim was dismissed on motion for summary judgment entered on May 11, 2010. Allegheny's claims against ICG were also dismissed by summary judgment, but the claims against Wolf Run and Hunter Ridge were not. The court conducted a non-jury trial of this matter beginning on January 10, 2011 and concluding on February 1, 2011. At the trial, Allegheny presented its evidence for breach of contract and claimed that it is entitled to past and future damages in the aggregate of between $228 million and $377 million. Wolf Run and Hunter Ridge presented their defense of the claims, including evidence with respect to the existence of force majeure conditions and excuse under the contract and applicable law. Wolf Run and Hunter Ridge presented evidence that Allegheny's damages calculations were significantly inflated because it did not seek to determine damages as of the time of the breach and in some instances artificially assumed future nondelivery or did not take into account the apparent requirement to supply coal in the future. On May 2, 2011, the trial court entered a Memorandum and Verdict determining that Wolf Run had breached the coal supply contract and that the performance shortfall was not excused by force majeure. The trial court awarded total damages and interest in the amount of $104.1 million, which consisted of $13.8 million for past damages, and $90.3 million for future damages. ICG and Allegheny filed post-verdict motions in the trial court and on August 23, 2011, the court denied the parties' motions. The court entered a final judgment on August 25, 2011, in the amount of $104.1 million, which included pre-judgment interest. The parties appealed the lower court's decision to the Superior Court of Pennsylvania. On August 13, 2012, the Superior Court of Pennsylvania affirmed the award of past damages, but ruled that the lower court should have calculated future damages as of the date of breach, and remanded the matter back to the lower court with instructions to recalculate that portion of the award. On November 19, 2012, Allegheny filed a Petition for Allowance of Appeal with the Supreme Court of Pennsylvania and Wolf Run and Hunter Ridge filed an Answer. On July 2, 2013, the Supreme Court of Pennsylvania denied the Petition of Allowance. As this action finalized the past damage award, Wolf Run paid $15.6 million for the past damage amount, including interest, to Allegheny in July 2013. The court held a hearing on this matter on November 5, 2014 and on February 16, 2015 awarded Allegheny$7.5 million plus interest for the future damages. In addition, the Company is a party to numerous claims and lawsuits with respect to various matters. As of December 31, 2014 and 2013, the Company had accrued $22.3 million and $30.4 million, respectively, for all legal matters, including $10.1 million and $11.7 million, respectively, classified as current. The ultimate resolution of any such legal matter could result in outcomes which may be materially different from amounts the Company has accrued for such matters. The Company has unconditional purchase obligations relating to purchases of coal, materials and supplies and capital commitments, other than reserve acquisitions, and is also a party to transportation capacity commitments. The future commitments under these agreements total $265.6 million in 2015, $118.1 million in 2016, $114.7 million in 2017, $82.2 million in 2018, $73.5 million in 2019 and $279.4 million thereafter. During the years ended December 31, 2014, 2013 and 2012, the Company fulfilled its commitments under agreements containing unconditional obligations. The Company recognized expense relating to transportation capacity agreements of $36.5 million, $12.0 million, and $2.3 million during the years ended December 31, 2014, 2013 and 2012, respectively.

Segment Information

12 Months Ended

Dec. 31, 2014

Segment Reporting [Abstract]

Segment Information

The Company's reportable business segments are based on the major coal producing basins in which the Company operates and may include a number of mine complexes. The Company manages its coal sales by coal basin, not by individual mining complex. Geology, coal transportation routes to customers, regulatory environments and coal quality or type are characteristic to a basin, and, accordingly, market and contract pricing have developed by coal basin. Mining operations are evaluated based on their per-ton operating costs (defined as including all mining costs but excluding pass-through transportation expenses), as well as on other non-financial measures, such as safety and environmental performance. The Company’s reportable segments are the Powder River Basin (PRB) segment, with operations in Wyoming; and the Appalachia (APP) segment, with operations in West Virginia, Kentucky, Maryland and Virginia. “All Other” includes the Company’s coal mining operations in Colorado and Illinois and our ADDCAR subsidiary.

In 2014, the Company changed its measure of segment profit and loss to assess operating segment's performance and to allocate resources from "income from operations" to "adjusted earnings before interest, taxes, depreciation, depletion and amortization (Adjusted EBITDA)." The Company's management believes that Adjusted EBITDA presents a useful measure of our ability to service existing debt and incur additional debt based on ongoing operations. Adjusted EBITDA does not reflect mine closure or impairment costs, since those are not reflected in the operating income reviewed by management. See Note 5. "Impairment Charges and Mine Closure Costs" for discussion of these costs. The Corporate, Other and Eliminations grouping includes these charges, as well as the change in fair value of coal derivatives and coal trading activities, net; corporate overhead; land management activities; other support functions; and the elimination of intercompany transactions.

The asset amounts below represent an allocation of assets consistent with the basis used for the Company’s incentive compensation plans. The amounts in Corporate, Other and Eliminations represent primarily corporate assets (cash, receivables, investments, plant, property and equipment) as well as unassigned coal reserves, above-market acquired sales contracts and other unassigned assets.



		PRB			APP			All Other		Corporate, Other and Eliminations			Consolidated
Year Ended	December 31, 2014
Revenues		$	1,490,377		$	1,108,358		$	338,384	$	—		$2,937,119
Adjusted EBITDA		198,074			110,693			56,612		(85,236		)	280,143
Depreciation, depletion and amortization		168,522			205,732			40,125		4,369			418,748
Amortization of acquired sales contracts, net		(3,961		)	(9,433		)	207		—			(13,187		)
Total assets		1,772,230			3,379,834			339,809		2,937,850			8,429,723
Capital expenditures		44,305			23,638			12,993		66,350			147,286

Year Ended	December 31, 2013
Revenues		$	1,482,812		$	1,145,801		$	385,744	$	—		$	3,014,357
Adjusted EBITDA		206,910			88,883			94,948		(138,595		)	252,146
Depreciation, depletion and amortization		171,324			202,952			45,741		6,425			426,442
Amortization of acquired sales contracts, net		(3,656		)	(10,364		)	4,563		—			(9,457		)
Total assets		1,841,835			3,971,764			402,922		2,773,672			8,990,193
Capital expenditures		9,784			167,759			23,122		96,319			296,984

Year Ended	December 31, 2012
Revenues		$	1,524,536		$	1,793,576		$	450,014	$	—		$	3,768,126
Adjusted EBITDA		262,155			405,981			112,982		(201,246		)	579,872
Depreciation, depletion and amortization		166,539			271,221			49,911		4,540			492,211
Amortization of acquired sales contracts, net		(1,987		)	(23,926		)	724		—			(25,189		)
Total assets		1,972,522			3,875,105			834,287		3,324,863			10,006,777
Capital expenditures		23,410			275,476			68,220		28,119			395,225

A reconciliation of segment losses to consolidated loss from continuing operations before income taxes follows:



	Year Ended December 31,
	2014			2013			2012

Adjusted EBITDA	$	280,143		$	252,146		$	579,872
Depreciation, depletion and amortization	(418,748		)	(426,442		)	(492,211		)
Amortization of acquired sales contracts, net	13,187			9,457			25,189
Asset impairment costs	(24,113		)	(220,879		)	(539,182		)
Goodwill impairment	—			(265,423		)	(330,680		)
Settlement of UMWA legal claims	—			(12,000		)	—
Interest expense, net	(383,188		)	(374,664		)	(312,142		)
Nonoperating expense	—			(42,921		)	(23,668		)
Loss from continuing operations before income taxes	$	(532,719	)	$	(1,080,726	)	$	(1,092,822	)

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599

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-Name Accounting Standards Codification
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Quarterly Selected Financial Data

12 Months Ended

Dec. 31, 2014

Quarterly Financial Information [Abstract]

Quarterly Selected Financial Data



Year Ended	December 31, 2014	March 31			June 30			September 30			December 31
		(a)			(a) (c)			(a) (c)			(a) (c)
		(In thousands, except per share data)

Revenues		$	735,971		$	713,776		$	742,180		$	745,192
Gross profit (loss)		$	(49,842	)	$	(6,350	)	$	(5,851	)	$	32,264
Asset impairment and mine closure costs		$	—		$	1,512		$	5,060		$	17,541
Loss from operations		$	(73,123	)	$	(35,805	)	$	(35,300	)	$	(5,303	)
Net loss		$	(124,140	)	$	(96,860	)	$	(97,218	)	$	(240,135	)
Diluted loss per common share		$	(0.59	)	$	(0.46	)	$	(0.46	)	$	(1.13	)



Year Ended	December 31, 2013	March 31			June 30			September 30			December 31
		(a)			(a)			(a)			(a)
		(In thousands, except per share data)

Revenues		$	737,370		$	766,332		$	791,269		$	719,386
Gross profit (loss)		$	(18,560	)	$	2,505		$	90		$	(44,801	)
Asset impairment and mine closure costs		$	—		$	20,482		$	200,397		$	—
Goodwill impairment		$	—		$	—		$	—		$	265,423
Loss from operations		$	(51,431	)	$	(36,279	)	$	(234,753	)	$	(340,678	)
Loss from continuing operations		$	(84,316	)	$	(80,351	)	$	(207,767	)	$	(372,794	)
Income from discontinued operations, net of tax^(b)		$	14,267		$	8,145		$	79,404		$	1,580
Net loss		$	(70,049	)	$	(72,206	)	$	(128,363	)	$	(371,214	)
Diluted loss per common share from:
Income (loss) from continuing operations		$	(0.40	)	$	(0.38	)	$	(0.98	)	$	(1.76	)
Net loss		$	(0.33	)	$	(0.34	)	$	(0.61	)	$	(1.75	)

(a) Challenging coal markets resulted in impairment charges relating to mining and other operations, investments in equity method subsidiaries, prepaid mining royalties and goodwill in 2014 and 2013. See further discussion in Note 5, "Impairment Charges and Mine Closure Costs ", Note 6, "Goodwill ", and Note 9, " Equity Method Investments and Membership Interests in Joint Ventures."

(b) The Company entered into a definitive agreement on June 27, 2013 to sell Canyon Fuel and the sale was completed on August 16, 2013. Beginning in the second quarter of 2013, all quarterly filings with the Securities and Exchange Commission reflected Canyon Fuel as a discontinued operation in the consolidated statements of operations. See further information in Note 3, "Divestitures".

(c) The Company determined that it would not realize the benefit from federal and state net operating losses it generated in 2014, based on projections of future taxable income, and as a result, recorded a valuation allowance against net operating losses of $23.8. million, $18.3 million, $15.8 million and $169.0 million in the second, third and fourth quarters of 2014, respectively.

Supplemental Consolidating Financial Information

12 Months Ended

Dec. 31, 2014

Supplemental Condensed Consolidating Financial Information [Abstract]

Supplemental Consolidating Financial Information

Pursuant to the indentures governing Arch Coal, Inc.’s senior notes, certain wholly-owned subsidiaries of the Company have fully and unconditionally guaranteed the senior notes on a joint and several basis. The following tables present consolidating financial information for (i) the Company, (ii) the issuer of the senior notes, (iii) the guarantors under the senior notes, and (iv) the entities which are not guarantors under the senior notes (Arch Receivable Company, LLC and the Company’s subsidiaries outside the United States):

Condensed Consolidating Statements of Operations and Comprehensive Income

Year Ended December 31, 2014



	Parent/Issuer			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
	(In thousands)
Revenues	$	—		$	2,937,119		$	—		$	—		$	2,937,119
Costs, expenses and other
Cost of sales (exclusive of items shown separately below)	3,016			2,566,572			—			(3,395		)	2,566,193
Depreciation, depletion and amortization	5,154			413,559			35			—			418,748
Amortization of acquired sales contracts, net	—			(13,187		)	—			—			(13,187		)
Change in fair value of coal derivatives and coal trading activities, net	—			(3,686		)	—			—			(3,686		)
Asset impairment and mine closure costs	3,642			20,471			—			—			24,113
Selling, general and administrative expenses	79,902			29,739			6,626			(2,044		)	114,223
Other operating income, net	(4,480		)	(15,726		)	(4,987		)	5,439			(19,754		)
	87,234			2,997,742			1,674			—			3,086,650
Loss from investment in subsidiaries	(13,085		)	—			—			13,085			—
Loss from operations	(100,319		)	(60,623		)	(1,674		)	13,085			(149,531		)
Interest expense, net
Interest expense	(463,823		)	(26,137		)	(4,259		)	103,273			(390,946		)
Interest and investment income	31,389			74,511			5,131			(103,273		)	7,758
	(432,434		)	48,374			872			—			(383,188		)

Loss from continuing operations before income taxes	(532,753		)	(12,249		)	(802		)	13,085			(532,719		)
Provision for (benefit from) income taxes	25,600			—			34			—			25,634
Net loss	(558,353		)	(12,249		)	(836		)	13,085			(558,353		)
Total comprehensive loss	$	(592,804	)	$	(34,439	)	$	(836	)	$	35,275		$	(592,804	)

Condensed Consolidating Statements of Operations and Comprehensive Income

Year Ended December 31, 2013



	Parent/Issuer			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
	(In thousands)
Revenues	$	—		$	3,014,357		$	—		$	—		$	3,014,357
Costs, expenses and other
Cost of sales (exclusive of items shown separately below)	9,117			2,657,583			—			(3,564		)	2,663,136
Depreciation, depletion and amortization	5,949			420,458			35			—			426,442
Amortization of acquired sales contracts, net	—			(9,457		)	—			—			(9,457		)
Change in fair value of coal derivatives and coal trading activities, net	—			7,845			—			—			7,845
Asset impairment and mine closure costs	78,150			142,729			—			—			220,879
Goodwill impairment	—			265,423			—			—			265,423
Selling, general and administrative expenses	88,820			39,825			7,038			(2,235		)	133,448
Other operating income, net	4,209			(34,856		)	(5,370		)	5,799			(30,218		)
	186,245			3,489,550			1,703			—			3,677,498
Loss from investment in subsidiaries	(328,889		)	—			—			328,889			—
Loss from operations	(515,134		)	(475,193		)	(1,703		)	328,889			(663,141		)
Interest expense, net
Interest expense	(449,614		)	(24,747		)	(4,214		)	97,308			(381,267		)
Interest and investment income	30,285			68,248			5,378			(97,308		)	6,603
	(419,329		)	43,501			1,164			—			(374,664		)

Net loss resulting from early retirement and refinancing of debt	(42,921		)	—			—			—			(42,921		)
Loss from continuing operations before income taxes	(977,384		)	(431,692		)	(539		)	328,889			(1,080,726		)
Provision for (benefit from) income taxes	(335,552		)	—			54			—			(335,498		)
Loss from continuing operations	(641,832		)	(431,692		)	(593		)	328,889			(745,228		)
Income from discontinued operations, including gain on sale - net of tax	—			103,396			—			—			103,396
Net loss	$	(641,832	)	$	(328,296	)	$	(593	)	$	328,889		$	(641,832	)
Total comprehensive loss	$	(587,633	)	$	(304,278	)	$	(593	)	$	304,871		$	(587,633	)

Condensed Consolidating Statements of Operations and Comprehensive Income

Year Ended December 31, 2012



	Parent/Issuer			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
	(In thousands)
Revenues	$	—		$	3,768,126		$	—		$	—		$	3,768,126
Costs, expenses and other													—
Cost of sales (exclusive of items shown separately below)	10,921			3,144,178			—			—			3,155,099
Depreciation, depletion and amortization	5,392			486,786			33			—			492,211
Amortization of acquired sales contracts, net	—			(25,189		)	—			—			(25,189		)
Change in fair value of coal derivatives and coal trading activities, net	—			(16,590		)	—			—			(16,590		)
Asset impairment and mine closure costs	—			539,182			—			—			539,182
Goodwill impairment	—			330,680			—			—			330,680
Contract settlement resulting from Patriot Coal bankruptcy	—			58,335			—			—			58,335
Reduction in accrual related to acquired litigation	—			(79,532		)	—			—			(79,532		)
Selling, general and administrative expenses	84,199			44,363			8,785			(3,048		)	134,299
Other operating income, net	(13,392		)	(39,209		)	(13,804		)	3,048			(63,357		)
	87,120			4,443,004			(4,986		)	—			4,525,138
Loss from investment in subsidiaries	(589,665		)	—			—			589,665			—
Income (loss) from operations	(676,785		)	(674,878		)	4,986			589,665			(757,012		)
Interest expense, net
Interest expense	(366,584		)	(34,849		)	(3,221		)	87,039			(317,615		)
Interest and investment income	27,750			57,268			7,494			(87,039		)	5,473
	(338,834		)	22,419			4,273			—			(312,142		)
Other non-operating expense
Net loss resulting from early retirement of debt	(21,975		)	(1,693		)	—			—			(23,668		)

Income (loss) from continuing operations before income taxes	(1,037,594		)	(654,152		)	9,259			589,665			(1,092,822		)
Provision for (benefit from) income taxes	(353,907		)	—			—			—			(353,907		)
Income (loss) from continuing operations	(683,687		)	(654,152		)	9,259			589,665			(738,915		)
Income from discontinued operations, net of tax	—			55,228			—			—			55,228
Net Income (loss)	(683,687		)	(598,924		)	9,259			589,665			(683,687		)
Less: Net income attributable to noncontrolling interest	(268		)	—			—			—			(268		)
Net Income (loss) attributable to Arch Coal, Inc.	$	(683,955	)	$	(598,924	)	$	9,259		$	589,665		$	(683,955	)
Total comprehensive income (loss)	$	(692,239	)	$	(604,903	)	$	9,259		$	595,644		$	(692,239	)

Condensed Consolidating Balance Sheets

December 31, 2014



	Parent/Issuer		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated
	(In thousands)
Assets
Cash and cash equivalents	$	572,185	$	150,358	$	11,688	$	—		$	734,231
Short term investments	248,954		—		—		—			248,954
Receivables	9,656		15,933		211,043		(4,615		)	232,017
Inventories	—		190,253		—		—			190,253
Other	89,211		41,455		6,630		—			137,296
Total current assets	920,006		397,999		229,361		(4,615		)	1,542,751

Property, plant and equipment, net	10,470		6,442,623		2		363			6,453,458

Investment in subsidiaries	7,464,221		—		—		(7,464,221		)	—
Intercompany receivables	—		2,021,110		—		(2,021,110		)	—
Note receivable from Arch Western	675,000		—		—		(675,000		)	—
Other	131,884		300,058		1,572		—			433,514
Total assets	$	9,201,581	$	9,161,790	$	230,935	$	(10,164,583	)	$	8,429,723

Liabilities and Stockholders’ Equity
Accounts payable	$	23,394	$	156,664	$	55	$	—		$	180,113
Accrued expenses and other current liabilities	85,899		220,017		1,095		(4,615		)	302,396
Current maturities of debt	27,625		9,260		—		—			36,885
Total current liabilities	136,918		385,941		1,150		(4,615		)	519,394
Long-term debt	5,084,839		38,646		—		—			5,123,485
Intercompany payables	1,817,755		—		203,355		(2,021,110		)	—
Note payable to Arch Coal	—		675,000		—		(675,000		)	—
Asset retirement obligations	981		397,915		—		—			398,896
Accrued pension benefits	5,967		10,293		—		—			16,260
Accrued postretirement benefits other than pension	4,430		28,238		—		—			32,668
Accrued workers’ compensation	9,172		85,119		—		—			94,291
Deferred income taxes	422,809		—		—		—			422,809
Other noncurrent liabilities	50,919		102,461		386		—			153,766
Total liabilities	7,533,790		1,723,613		204,891		(2,700,725		)	6,761,569
Stockholders’ equity	1,667,791		7,438,177		26,044		(7,463,858		)	1,668,154
Total liabilities and stockholders’ equity	$	9,201,581	$	9,161,790	$	230,935	$	(10,164,583	)	$	8,429,723

Condensed Consolidating Balance Sheets

December 31, 2013



	Parent/Issuer		Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Eliminations			Consolidated
	(In thousands)
Assets
Cash and cash equivalents	$	799,333	$	100,418		$	11,348	$	—		$	911,099
Short term investments	248,414		—			—		—			248,414
Receivables	14,177		23,018			197,015		(4,637		)	229,573
Inventories	—		264,161			—		—			264,161
Other	84,401		43,617			806		—			128,824
Total current assets	1,146,325		431,214			209,169		(4,637		)	1,782,071

Property, plant and equipment, net	24,851		6,709,398			37		—			6,734,286

Investment in subsidiaries	7,741,589		—			—		(7,741,589		)	—
Intercompany receivables			1,953,719			—		(1,953,719		)	—
Note receivable from Arch Western	675,000		—			—		(675,000		)	—
Other	162,287		311,463			86		—			473,836
Total other assets	8,578,876		2,265,182			86		(10,370,308		)	473,836
Total assets	$	9,750,052	$	9,405,794		$	209,292	$	(10,374,945	)	$	8,990,193

Liabilities and Stockholders’ Equity
Accounts payable	$	17,781	$	158,224		$	137	$	—		$	176,142
Accrued expenses and other current liabilities	53,779		228,664			781		(4,637		)	278,587
Current maturities of debt	28,882		4,611			—		—			33,493
Total current liabilities	100,442		391,499			918		(4,637		)	488,222
Long-term debt	5,099,833		18,169			—					5,118,002
Intercompany payables	1,772,624		—			181,095		(1,953,719		)	—
Note payable to Arch Coal	—		675,000			—		(675,000		)	—
Asset retirement obligations	1,095		401,618			—		—			402,713
Accrued pension benefits	7,797		(686		)	—		—			7,111
Accrued postretirement benefits other than pension	12,079		27,176			—		—			39,255
Accrued workers’ compensation	21,546		56,516			—		—			78,062
Deferred income taxes	413,546		—			—		—			413,546
Other noncurrent liabilities	67,841		121,794			398		—			190,033
Total liabilities	7,496,803		1,691,086			182,411		(2,633,356		)	6,736,944
Stockholders’ equity	2,253,249		7,714,708			26,881		(7,741,589		)	2,253,249
Total liabilities and stockholders’ equity	$	9,750,052	$	9,405,794		$	209,292	$	(10,374,945	)	$	8,990,193

Condensed Consolidating Statements of Cash Flows

Year Ended December 31, 2014



	Parent/Issuer			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated
	(In thousands)
Cash provided by (used in) operating activities	$	(324,688	)	$	305,048		$	(13,942	)	$	—	$	(33,582	)
Investing Activities
Capital expenditures	(2,700		)	(144,586		)	—			—		(147,286		)
Additions to prepaid royalties	—			(7,317		)	—			—		(7,317		)
Proceeds from disposals and divestitures	57,625			4,733			—			—		62,358
Purchases of short term investments	(211,929		)	—			—			—		(211,929		)
Proceeds from sales of short term investments	205,611			—			—			—		205,611
Proceeds from sales of investments in equity securities	9,464			—			—			—		9,464
Investments in and advances to affiliates	(2,541		)	(14,116		)	—			—		(16,657		)
Cash provided by (used in) investing activities	55,530			(161,286		)	—			—		(105,756		)
Financing Activities
Payments on term loan	(19,500		)	—			—			—		(19,500		)
Net payments on other debt	(1,258		)	(4,437		)	—			—		(5,695		)
Debt financing costs	(2,219		)	—			(2,300		)	—		(4,519		)
Dividends paid	(2,123		)	—			—			—		(2,123		)
Other	(15		)	—			(5,678		)	—		(5,693		)
Transactions with affiliates, net	67,125			(89,385		)	22,260			—		—
Cash provided by (used in) financing activities	42,010			(93,822		)	14,282			—		(37,530		)
Increase (decrease) in cash and cash equivalents	(227,148		)	49,940			340			—		(176,868		)
Cash and cash equivalents, beginning of period	799,333			100,418			11,348			—		911,099
Cash and cash equivalents, end of period	$	572,185		$	150,358		$	11,688		$	—	$	734,231

Condensed Consolidating Statements of Cash Flows

Year Ended December 31, 2013



	Parent/Issuer			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	(In thousands)
Cash provided by (used in) operating activities	$	(632,060	)	$	637,193		$	50,609		$	—		$	55,742
Investing Activities
Capital expenditures	(3,320		)	(293,664		)	—			—			(296,984		)
Additions to prepaid royalties	—			(14,947		)	—			—			(14,947		)
Proceeds from disposals and divestitures	—			433,453			—			—			433,453
Proceeds from sales-leaseback transactions	—			34,919			—			—			34,919
Purchases of short term investments	(213,726		)	—			—			—			(213,726		)
Proceeds from sales of short term investments	194,537			—			—			—			194,537
Investments in and advances to affiliates	(5,451		)	(10,321		)	—			512			(15,260		)
Change in restricted cash	3,453			—			—			—			3,453
Cash provided by (used in) investing activities	(24,507		)	149,440			—			512			125,445
Financing Activities
Contributions from parent	—			512			—			(512		)	—
Proceeds from term loan and senior notes	644,000			—			—			—			644,000
Payments to retire debt	(628,660		)	—			—			—			(628,660		)
Payments on term loan	(17,250		)	—			—			—			(17,250		)
Net payments on other debt	(6,324		)	(512		)	—			—			(6,836		)
Debt financing costs	(19,864		)	—			(625		)	—			(20,489		)
Dividends paid	(25,475		)	—			—			—			(25,475		)
Transactions with affiliates, net	838,160			(786,683		)	(51,477		)	—			—
Cash provided by (used in) financing activities	784,587			(786,683		)	(52,102		)	(512		)	(54,710		)
Increase (decrease) in cash and cash equivalents	128,020			(50		)	(1,493		)	—			126,477
Cash and cash equivalents, beginning of period	671,313			100,468			12,841			—			784,622
Cash and cash equivalents, end of period	$	799,333		$	100,418		$	11,348		$	—		$	911,099

Condensed Consolidating Statements of Cash Flows

Year Ended December 31, 2012



	Parent/Issuer			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	(In thousands)
Cash provided by (used in) operating activities	$	(571,576	)	$	781,551		$	122,829		$	—		$	332,804
Investing Activities
Change in restricted cash	6,869			—			—			—			6,869
Capital expenditures	(4,424		)	(390,801		)	—			—			(395,225		)
Proceeds from disposals and divestitures	—			1,328			21,497			—			22,825
Investments in and advances to affiliates	(6,287		)	(13,134		)	—			1,663			(17,758		)
Purchases of short term investments	(236,862		)	—			—			—			(236,862		)
Proceeds from sales of short term investments	1,754			—			—			—			1,754
Purchase of noncontrolling interest	(17,500		)	—			—			—			(17,500		)
Additions to prepaid royalties	—			(13,269		)	—			—			(13,269		)
Cash provided by (used in) investing activities	(256,450		)	(415,876		)	21,497			1,663			(649,166		)
Financing Activities
Contributions from parent	—			1,663			—			(1,663		)	—
Proceeds from term loan and senior notes	1,993,253			—			—			—			1,993,253
Payments to retire debt	—			(452,934		)	—			—			(452,934		)
Net decrease in borrowings under lines of credit and commercial paper program	(375,000		)	—			(106,300		)	—			(481,300		)
Payments on term loan	(7,625		)	—			—			—			(7,625		)
Net payments on other debt	(682		)	—			—			—			(682		)
Debt financing costs	(50,022		)	—			(546		)	—			(50,568		)
Dividends paid	(42,440		)	—			—			—			(42,440		)
Issuance of common stock under incentive plans	5,131			—			—			—			5,131
Transactions with affiliates, net	(84,651		)	110,639			(25,988		)	—			—
Cash provided by (used in) financing activities	1,437,964			(340,632		)	(132,834		)	(1,663		)	962,835
Increase in cash and cash equivalents	609,938			25,043			11,492			—			646,473
Cash and cash equivalents, beginning of period	61,375			75,425			1,349			—			138,149
Cash and cash equivalents, end of period	$	671,313		$	100,468		$	12,841		$	—		$	784,622

Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2014

Valuation and Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts



			Additions
			(Reductions)
	Balance at		Charged to		Charged to						Balance at
	Beginning of		Costs and		Other						End of
	Year		Expenses		Accounts				Deductions ^(a)		Year
	(In thousands)
Year ended December 31, 2013
Reserves deducted from asset accounts:
Accounts receivable and other receivables	$	775	$	—	$	—			$	616	$	159
Current assets — supplies and inventory	8,446		580		(76		)	^(b)	2,325		6,625
Deferred income taxes	43,322		226,929		—				—		270,251
Year ended December 31, 2013
Reserves deducted from asset accounts:
Accounts receivable and other receivables	$	1,043	$	346	$	—			$	614	$	775
Current assets — supplies and inventory	12,589		503		(2,274		)	(b)	2,372		8,446
Deferred income taxes	34,663		8,659		—				—		43,322
Year ended December 31, 2012
Reserves deducted from asset accounts:
Accounts receivable and other receivables	$	17	$	1,039	$	—			$	13	$	1,043
Current assets — supplies and inventory	13,107		1,961		—				2,479		12,589
Deferred income taxes	2,831		31,832		—				—		34,663

(a) Reserves utilized, unless otherwise indicated.

(b) Disposition of subsidiaries

Accounting Policies (Policies)	12 Months Ended
Accounting Policies (Policies)	Dec. 31, 2014
Accounting Policies [Abstract]
Consolidation Policy	Basis of Presentation The accompanying consolidated financial statements include the accounts of Arch Coal, Inc. and its subsidiaries and controlled entities (the “Company”). The Company’s primary business is the production of thermal and metallurgical coal from surface and underground mines located throughout the United States, for sale to utility, industrial and steel producers both in the United States and around the world. The Company currently operates mining complexes in West Virginia, Kentucky, Maryland, Virginia, Illinois, Wyoming and Colorado. All subsidiaries are wholly-owned. Intercompany transactions and accounts have been eliminated in consolidation. The Company completed the sale of Canyon Fuel Company, LLC (Canyon Fuel) on August 16, 2013. The results of these mining complexes have been segregated from continuing operations and are reflected, net of tax, as discontinued operations in the consolidated statements of operations for all periods presented. See further discussion in Note 3, "Divestitures". In response to weak coal markets, the Company has idled or closed mines in the Appalachia region and sold other non-core operating subsidiaries and assets. The results from these operations and gains or losses on the disposal are reflected in income from continuing operations in the consolidated statements of operations. See further discussion in Note 5, "Impairment Charges and Mine Closure Costs".
Accounting Pronouncements	Accounting Pronouncements There are no accounting pronouncements whose adoption had, or is expected to have, a material impact on the Company's consolidated financial statements.
Accounting Estimates	Accounting Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and revenues and expenses in the accompanying consolidated financial statements and the disclosure of contingent assets and liabilities. Actual results could differ from those estimates.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents are stated at cost. Cash equivalents consist of highly-liquid investments with an original maturity of three months or less when purchased.
Accounts Receivable	Accounts Receivable Accounts receivable are recorded at amounts that are expected to be collected, based on past collection history, the economic environment and specified risks identified in the receivables portfolio.
Inventories	Inventories Coal and supplies inventories are valued at the lower of average cost or market. Coal inventory costs include labor, supplies, equipment costs, transportation costs incurred prior to the transfer of title to customers and operating overhead. The costs of removing overburden, called stripping costs, incurred during the production phase of the mine are considered variable production costs and are included in the cost of the coal extracted during the period the stripping costs are incurred.
Investments and Membership Interests in Joint Ventures	Investments and Membership Interests in Joint Ventures Investments and membership interests in joint ventures are accounted for under the equity method of accounting if the Company has the ability to exercise significant influence, but not control, over the entity. The Company's share of the entity's income or loss is reflected in "Other operating income, net" in the consolidated statements of operations. Information about investment activity is provided in Note 9, " Equity Method Investments and Membership Interests in Joint Ventures". Investments in debt securities and marketable equity securities that do not qualify for equity method accounting are classified as available-for-sale and are recorded at their fair values. Unrealized gains and losses on these investments are recorded in other comprehensive income or loss. A decline in the value of an investment that is considered other-than-temporary would be recognized in operating expenses.
Acquired Sales Contracts	Acquired Sales Contracts Coal supply agreements (sales contracts) acquired in a business combination are capitalized at their fair value and amortized over the tons of coal shipped during the term of the contract. The fair value of a sales contract is determined by discounting the cash flows attributable to the difference between the contract price and the prevailing forward prices for the tons under contract at the date of acquisition. See Note 10, "Acquired Sales Contracts" for further information related to the Company's acquired sales contracts.
Exploration Costs	Exploration Costs Costs to acquire permits for exploration activities are capitalized. Drilling and other costs related to locating coal deposits and evaluating the economic viability of such deposits are expensed as incurred.
Prepaid Royalties	Prepaid Royalties Leased mineral rights are often acquired through royalty payments. When royalty payments represent prepayments recoupable against royalties owed on future revenues from the underlying coal, they are recorded as a prepaid asset, with amounts expected to be recouped within one year classified as current. When coal from these leases is sold, the royalties owed are recouped against the prepayment and charged to cost of sales. An impairment charge is recognized for prepaid royalties that are not expected to be recouped.
Property, Plant and Equipment	Property, Plant and Equipment Plant and Equipment Plant and equipment are recorded at cost. Interest costs incurred during the construction period for major asset additions are capitalized. We capitalized $15.9 million and $15.6 million of interest costs during the years ended December 31, 2013 and 2012, respectively. Expenditures that extend the useful lives of existing plant and equipment or increase the productivity of the asset are capitalized. The cost of maintenance and repairs that do not extend the useful life or increase the productivity of the asset is expensed as incurred. Preparation plants and loadouts are depreciated using the units-of-production method over the estimated recoverable reserves, subject to a minimum level of depreciation. Other plant and equipment are depreciated principally using the straight-line method over the estimated useful lives of the assets, limited by the remaining life of the mine. The useful lives of mining equipment, including longwalls, draglines and shovels, range from 5 to 32 years. The useful lives of buildings and leasehold improvements generally range from 10 to 30 years. Deferred Mine Development Costs of developing new mines or significantly expanding the capacity of existing mines are capitalized and amortized using the units-of-production method over the estimated recoverable reserves that are associated with the property being benefited. Costs may include construction permits and licenses; mine design; construction of access roads, shafts, slopes and main entries; and removing overburden to access reserves in a new pit. Additionally, deferred mine development includes the asset cost associated with asset retirement obligations. Coal Lands and Mineral Rights Rights to coal reserves may be acquired directly through governmental or private entities. A significant portion of the Company's coal reserves are controlled through leasing arrangements. Lease agreements are generally long-term in nature (original terms range from 10 to 50 years), and substantially all of the leases contain provisions that allow for automatic extension of the lease term providing certain requirements are met. The net book value of the Company's coal interests was $4.7 billion and $4.8 billion at December 31, 2014 and 2013, respectively. Payments to acquire royalty lease agreements and lease bonus payments are capitalized as a cost of the underlying mineral reserves and depleted over the life of proven and probable reserves. Coal lease rights are depleted using the units-of-production method, and the rights are assumed to have no residual value. Future lease bonus payments total $75.4 million in 2015 and $60.0 million in 2016. Depreciation, depletion and amortization. The depreciation, depletion and amortization related to long-lived assets is reflected in the statement of operations as a separate line item. No depreciation, depletion or amortization is included in any other operating cost categories. Impairment If facts and circumstances suggest that the carrying value of a long-lived asset or asset group may not be recoverable, the asset or asset group is reviewed for potential impairment. If this review indicates that the carrying amount of the asset will not be recoverable through projected undiscounted cash flows generated by the asset and its related asset group over its remaining life, then an impairment loss is recognized by reducing the carrying value of the asset to its fair value. The Company may, under certain circumstances, idle mining operations in response to market conditions or other factors. Because an idling is not a permanent closure, it is not considered an automatic indicator of impairment. See additional discussion in Note 5, "Impairment Charges and Mine Closure Costs".
Goodwill	Goodwill In a business combination, goodwill represents the excess of the purchase price over the fair value assigned to the net tangible and identifiable intangible assets acquired. The Company tests goodwill for impairment annually as of the beginning of the fourth quarter, or when circumstances indicate a possible impairment may exist. If the results of the testing indicate that the carrying amount of a reporting unit exceeds the fair value of the reporting unit, the fair value of goodwill must be calculated. An impairment loss generally would be recognized when the carrying amount of goodwill exceeds the implied fair value of goodwill, determined by subtracting the fair value of the other assets and liabilities associated with the reporting unit from the total fair value of the reporting unit. The fair value of a reporting unit is determined using a discounted cash flow ("DCF") technique. A number of significant assumptions and estimates are involved in the application of the DCF analysis to forecast operating cash flows, including the discount rate, projections of production volumes, quality and costs to produce; projections of sales volumes by market (e.g., thermal versus metallurgical); and projections of market prices. See additional discussion in Note 6, "Goodwill."
Deferred Financing Costs	Deferred Financing Costs The Company capitalizes costs incurred in connection with new borrowings, the establishment or enhancement of credit facilities and the issuance of debt securities. These costs are amortized as an adjustment to interest expense over the life of the borrowing or term of the credit facility using the interest method. The unamortized balance of deferred financing costs was $89.1 million and $99.2 million at December 31, 2014 and 2013, respectively. Amounts classified as current were $25.5 million and $19.7 million at December 31, 2014 and 2013, respectively. Current amounts are recorded in "Other current assets" and noncurrent amounts are recorded in "Other noncurrent assets" in the accompanying consolidated balance sheets.
Revenue Recognition	Revenue Recognition Revenues include sales to customers of coal produced at Company operations and coal purchased from third parties. The Company recognizes revenue at the time risk of loss passes to the customer at contracted amounts. Transportation costs are included in cost of sales and amounts billed by the Company to its customers for transportation are included in revenues.
Other Operating Income and Expenses	Other Operating Income and Expenses Other operating income, net in the accompanying consolidated statements of operations reflects income and expense from sources other than physical coal sales, including: bookouts, or the practice of offsetting purchase and sale contracts for shipping convenience purposes; contract settlements; liquidated damage charges related to unused terminal and port capacity; royalties earned from properties leased to third parties; income from equity investments (Note 9); gains and losses from divestitures and dispositions of assets (Note 3 ); and realized gains and losses on derivatives that do not qualify for hedge accounting and are not held for trading purposes (Note 11).
Asset Retirement Obligations	Asset Retirement Obligations The Company's legal obligations associated with the retirement of long-lived assets are recognized at fair value at the time the obligations are incurred. Accretion expense is recognized through the expected settlement date of the obligation. Obligations are incurred at the time development of a mine commences for underground and surface mines or construction begins for support facilities, refuse areas and slurry ponds. The obligation's fair value is determined using a discounted cash flow technique and is based upon permit requirements and various estimates and assumptions that would be used by market participants, including estimates of disturbed acreage, reclamation costs and assumptions regarding equipment productivity. Upon initial recognition of a liability, a corresponding amount is capitalized as part of the carrying value of the related long-lived asset. The Company reviews its asset retirement obligation at least annually and makes necessary adjustments for permit changes as granted by state authorities and for revisions of estimates of the amount and timing of costs. For ongoing operations, adjustments to the liability result in an adjustment to the corresponding asset. For idle operations, adjustments to the liability are recognized as income or expense in the period the adjustment is recorded. Any difference between the recorded obligation and the actual cost of reclamation is recorded in profit or loss in the period the obligation is settled. See additional discussion in Note 15, "Asset Retirement Obligations."
Derivative Instruments	Derivative Instruments The Company generally utilizes derivative instruments to manage exposures to commodity prices. Additionally, the Company may hold certain coal derivative instruments for trading purposes. Derivative financial instruments are recognized in the balance sheet at fair value. Certain coal contracts may meet the definition of a derivative instrument, but because they provide for the physical purchase or sale of coal in quantities expected to be used or sold by the Company over a reasonable period in the normal course of business, they are not recognized on the balance sheet. Certain derivative instruments are designated as the hedge instrument in a hedging relationship. In a fair value hedge, the Company hedges the risk of changes in the fair value of a firm commitment, typically a fixed-price coal sales contract. Changes in both the hedged firm commitment and the fair value of a derivative used as a hedge instrument in a fair value hedge are recorded in earnings. In a cash flow hedge, the Company hedges the risk of changes in future cash flows related to a forecasted purchase or sale. Changes in the fair value of the derivative instrument used as a hedge instrument in a cash flow hedge are recorded in other comprehensive income or loss. Amounts in other comprehensive income or loss are reclassified to earnings when the hedged transaction affects earnings and are classified in a manner consistent with the transaction being hedged. The Company formally documents the relationships between hedging instruments and the respective hedged items, as well as its risk management objectives for hedge transactions. The Company evaluates the effectiveness of its hedging relationships both at the hedge's inception and on an ongoing basis. Any ineffective portion of the change in fair value of a derivative instrument used as a hedge instrument in a fair value or cash flow hedge is recognized immediately in earnings. The ineffective portion is based on the extent to which exact offset is not achieved between the change in fair value of the hedge instrument and the cumulative change in expected future cash flows on the hedged transaction from inception of the hedge in a cash flow hedge or the change in the fair value. Ineffectiveness was insignificant for the years ended December 31, 2014, 2013 and 2012 See Note 11, "Derivatives" for further disclosures related to the Company's derivative instruments.
Fair Value	Fair Value Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly hypothetical transaction between market participants at a given measurement date. Valuation techniques used must maximize the use of observable inputs and minimize the use of unobservable inputs. See Note 16, "Fair Values Measurements" for further disclosures related to the Company's recurring fair value estimates.
Income Taxes	Income Taxes Deferred income taxes are provided for temporary differences arising from differences between the financial statement and tax basis of assets and liabilities existing at each balance sheet date using enacted tax rates anticipated to be in effect when the related taxes are expected to be paid or recovered. A valuation allowance is established if it is more likely than not that a deferred tax asset will not be realized. Management reassesses the ability to realize its deferred tax assets annually in the fourth quarter or when circumstances indicate that the ability to realize deferred tax assets has changed. In determining the need for a valuation allowance, the Company considers projected realization of tax benefits based on expected levels of future taxable income, available tax planning strategies and the reversal of temporary differences. Benefits from tax positions that are uncertain are not recognized unless the Company concludes that it is more likely than not that the position would be sustained in a dispute with taxing authorities, should the dispute be taken to the court of last resort. The Company would measure any such benefit at the largest amount of benefit that is greater than 50 percent likely of being realized upon settlement with taxing authorities. See Note 14, "Taxes" for further disclosures about income taxes.
Benefit Plans	Benefit Plans The Company has non-contributory defined benefit pension plans covering most of its salaried and hourly employees. Benefits are generally based on the employee's age and compensation. The Company also currently provides certain postretirement medical and life insurance coverage for eligible employees. The cost of providing these benefits are determined on an actuarial basis and accrued over the employee's period of active service. The Company recognizes the overfunded or underfunded status of these plans as determined on an actuarial basis on the balance sheet and the changes in the funded status are recognized in other comprehensive income. See Note 20, "Employee Benefit Plans" for additional disclosures relating to these obligations.
Stock-Based Compensation	Stock-Based Compensation The compensation cost of all stock-based awards is determined based on the grant-date fair value of the award, and is recognized over the requisite service period. The grant-date fair value of option awards is determined using a Black-Scholes option pricing model. Compensation cost for an award with performance conditions is accrued if it is probable that the conditions will be met. See further discussion in Note 18, "Stock-Based Compensation and Other Incentive Plans ."
Accounting Standards Issued	Accounting Standards Issued In May 2014, the FASB issued comprehensive authoritative guidance for the recognition and presentation of revenue from contracts with customers. The revenue recognition model is based on changes in contract assets (right to receive consideration) and liabilities (obligations to provide a good or perform a service). The guidance also requires comprehensive quantitative and qualitative disclosures intended to enable financial statement users to understand the nature, timing and uncertainty of revenue and the related cash flows. This guidance will be effective for the Company in the first quarter of 2017, with early adoption not permitted. The Company is currently assessing the impact the guidance will have upon adoption, but expects no significant changes to its existing revenue recognition policies. In August 2014, the FASB issued guidance requiring management to evaluate whether there are conditions or events, considered in the aggregate, that raise substantial doubt about the entity's ability to continue as a going concern within one year after the date that the financial statements are issued and requires disclosures to describe the principal conditions or events that raise substantial doubt and management's evaluation and plans to alleviate such doubt. If the doubt is not alleviated by management's plans, the notes to the financial statements must include a statement that the doubt exists. This requirement is effective for annual and interim periods starting with the period ending December 31, 2016.

Divestitures (Tables)

12 Months Ended

Dec. 31, 2014

Discontinued Operations and Disposal Groups [Abstract]

Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures

The following table summarizes the assets and liabilities of these divested operations reflected in the December 31, 2013 consolidated balance sheet (in thousands):




Inventories	$	33,730
Other current assets	2,060
Net property, plant & equipment	35,560
Other noncurrent assets	190
Accounts payable and accrued expenses	10,599
Other noncurrent liabilities	38,340

The following table summarizes the results of discontinued operations through the date of disposition:



	Year Ended December 31,
	2013		2012

Total Revenues	$	219,002	$	390,912
Income from discontinued operations before income taxes	$	32,167	$	75,418
Gain on sale	120,321		—
Less: income tax expense	49,092		20,190
Income from discontinued operations, including gain on sale - net of tax	$	103,396	$	55,228

Basic earnings per common share from discontinued operations	$	0.49	$	0.26
Diluted earnings per common share from discontinued operations	$	0.49	$	0.26

- Definition

+ References + Details

Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2014

Accumulated Other Comprehensive Income (Loss) [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

The following items are included in accumulated other comprehensive income (loss):




					Pension,
					Postretirement						Accumulated
					and Other Post-						Other
		Derivative			Employment			Available-for-			Comprehensive
		Instruments			Benefits			Sale Securities			Income (Loss)
		(In thousands)
Balance at	January 1, 2013	$	2,244		$	(18,286	)	$	(465	)	$	(16,507	)
Unrealized gains		168			48,482			5,935			54,585
Amounts reclassified from accumulated other comprehensive income (loss)		(1,847		)	916			545			(386		)
Balance at	December 31, 2013	565			31,112			6,015			37,692
Unrealized gains (losses)		3,677			(22,516		)	(5,727		)	(24,566		)
Amounts reclassified from accumulated other comprehensive income (loss)		(1,692		)	(5,736		)	(2,457		)	(9,885		)
Balance at	December 31, 2014	$	2,550		$	2,860		$	(2,169	)	$	3,241

Schedule of comprehensive income reclassifications

The following amounts were reclassified out of accumulated other comprehensive income (loss) during the years ended December 31, 2014 and 2013, respectively:



Details about accumulated other comprehensive income components	Reclassifications							Line Item in the Consolidated Statement of Operations
	2014				2013
	(in thousands)
Derivative instruments	$	2,643			$	2,886		Revenues
	(951		)		(1,039		)	Provision for (benefit from) income taxes
	$	1,692			$	1,847		Net of tax

Pension, postretirement and other post-employment benefits
Amortization of prior service credits	$	11,760		¹	$	13,705
Amortization of net actuarial gains (losses)	(2,797		)	¹	(15,136		)
	8,963				(1,431		)	Total before tax
	(3,227		)		515			Provision for (benefit from) income taxes
	$	5,736			$	(916	)	Net of tax

Available-for-sale securities	$	3,838		²	$	(852	)	Interest and investment income
	(1,381		)		307			Provision for (benefit from) income taxes
	$	2,457			$	(545	)	Net of tax
¹ Production-related benefits and workers' compensation costs are included in costs to produce coal.
2 The gains and losses on sales of available-for-sale-securities are determined on a specific identification basis.

Impairment Charges and Mine Closure Costs (Tables)

12 Months Ended

Dec. 31, 2014

Impairment Charges and Mine Closure Costs [Abstract]

Restructuring and Related Costs

In 2012, the closure and idling of mines in Appalachia discussed in Note 1, "Basis of Presentation" resulted in closure costs and related impairment charges as follow:



	In millions
Parts and supplies inventory writedown	$	2.6
Impairment of property, plant and equipment	95.6
Impairment of coal properties and deferred development costs	403.3
Royalty obligations	11.5
Employee termination benefits	12.3
Pension, postretirement and occupational disease curtailment gain, net	(1.8		)
	$	523.5

Goodwill (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

Changes in the carrying value of goodwill for the three years ended December 31, 2014 are as follows:



	(In thousands)
Balance at January 1, 2012	$	596,103
Impairment	(330,680		)
Balance at December 31, 2012	265,423
Impairment	(265,423		)
Balance at December 31, 2013	$	—

Inventories (Tables)

12 Months Ended

Dec. 31, 2014

Inventory Disclosure [Abstract]

Inventories

Inventories consist of the following:



	December 31,
	2014		2013
	(In thousands)
Coal	$	71,901	$	117,531
Repair parts and supplies	118,352		137,497
Work-in-process	—		9,133
	$	190,253	$	264,161

Investments in Available-for-Sale Securities (Tables)

12 Months Ended

Dec. 31, 2014

Available-for-sale Securities [Abstract]

Available-for-sale Securities

The Company's investments in available-for-sale marketable securities are as follows:



	December 31, 2014
										Balance Sheet
			Gross		Gross					Classification
			Unrealized		Unrealized			Fair		Short-Term		Other
	Cost Basis		Gains		Losses			Value		Investments		Assets
	(In thousands)
Available-for-sale:
Corporate notes and bonds	$	253,590	$	—	$	(4,636	)	$	248,954	$	248,954	$	—
Equity securities	3,910		4,125		(2,890		)	5,145		—		5,145
Total Investments	$	257,500	$	4,125	$	(7,526	)	$	254,099	$	248,954	$	5,145



	December 31, 2013
										Balance Sheet
			Gross		Gross					Classification
			Unrealized		Unrealized			Fair		Short-Term		Other
	Cost Basis		Gains		Losses			Value		Investments		Assets
	(In thousands)
Available-for-sale:
U.S. government and agency securities	$	65,002	$	11	$	(75	)	$	64,938	$	64,938	$	—
Corporate notes and bonds	184,773		7		(1,304		)	183,476		183,476		—
Equity securities	5,271		13,660		(2,902		)	16,029		—		16,029
Total Investments	$	255,046	$	13,678	$	(4,281	)	$	264,443	$	248,414	$	16,029

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details

Equity Method Investments and Membership Interests in Joint Ventures (Tables)

12 Months Ended

Dec. 31, 2014

Equity Method Investments and Joint Ventures [Abstract]

Schedule Of Equity Method Investments

Below are the equity method investments reflected in the consolidated balance sheets:



	Investee	Knight Hawk			DTA			Millennium			Tongue River			DKRW			Tenaska			Other			Total

Balance at	January 1, 2012	$	135,225		$	16,086		$	26,324		$	12,989		$	19,715		$	15,266		$	—		$	225,605
Investments in affiliates		—			—			—			—			—			—			—			—
Advances to (distributions from) affiliates, net		(7,151		)	4,335			8,798			1,708			—			—			—			7,690
Equity in comprehensive income (loss)		20,989			(4,959		)	(2,908		)	—			(4,200		)	(2		)	—			8,920
Balance at	December 31, 2012	149,063			15,462			32,214			14,697			15,515			15,264			—			242,215
Advances to (distributions from) affiliates, net		(13,536		)	3,644			6,476			4,004			—			—			200			788
Equity in comprehensive income (loss)		17,279			(4,969		)	(2,796		)	(282		)	(1,832		)	—			—			7,400
Impairment of equity investment		—			—			—			—			(13,683		)	(15,264		)	—			(28,947		)
Balance at	December 31, 2013	152,806			14,137			35,894			18,419			—			—			200			221,456
Advances to (distributions from) affiliates, net		(12,603		)	3,774			6,742			2,541			—			—			3,600			4,054
Equity in comprehensive income (loss)		18,274			(4,173		)	(2,413		)	(220		)	—			—			(1,136		)	10,332
Balance at	December 31, 2014	$	158,477		$	13,738		$	40,223		$	20,740		$	—		$	—		$	2,664		$	235,842

Acquired Sales Contracts (Tables)

12 Months Ended

Dec. 31, 2014

Acquired Sales Contracts [Abstract]

Schedule Of Acquired Sales Contracts

The acquired sales contracts reflected in the consolidated balance sheets are as follows:



	December 31, 2014									December 31, 2013
	Assets			Liabilities			Net Total			Assets			Liabilities			Net Total
	(In thousands)									(In thousands)
Acquired fair value	$	131,299		$	166,697					$	131,819		$	166,697
Accumulated amortization	(130,363		)	(134,988		)				(129,449		)	(120,367		)
Total	$	936		$	31,709		$	(30,773	)	$	2,370		$	46,330		$	(43,960	)
Balance Sheet classification:
Other current	$	462		$	12,453					$	1,324		$	14,373
Other noncurrent	$	474		$	19,256					$	1,046		$	31,957

Derivatives (Tables)

12 Months Ended

Dec. 31, 2014

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Price Risk Derivatives

At December 31, 2014, the Company held derivatives for risk management purposes that are expected to settle in the following years:



(Tons in thousands)	2015	2016	Total
Coal sales	4,522	280	4,802
Coal purchases	2,134	—	2,134

Disclosure Of Fair Value Of Derivatives

The fair value and location of derivatives reflected in the accompanying consolidated balance sheets are as follows:



	December 31, 2014								December 31, 2013
Fair Value of Derivatives	Asset			Liability					Asset			Liability
(In thousands)	Derivative			Derivative					Derivative			Derivative
Derivatives Designated as Hedging Instruments
Coal	$	6,535		$	(2,492	)			$	909		$	(26	)

Derivatives Not Designated as Hedging Instruments
Heating oil -- diesel purchases	300			—					4,681			—
Heating oil -- fuel surcharges	—			—					422			—
Coal held for trading purposes, exchange traded swaps and futures	96,898			(93,272		)			55,327			(45,763		)
Coal -- risk management	8,510			(3,688		)			6,342			(1,950		)
Total	105,708			(96,960		)			66,772			(47,713		)
Total derivatives	112,243			(99,452		)			67,681			(47,739		)
Effect of counterparty netting	(98,686		)	98,686					(47,727		)	47,727
Net derivatives as classified in the balance sheets	$	13,557		$	(766	)	$	12,791	$	19,954		$	(12	)	$	19,942



		December 31,
		2014			2013
Net derivatives as reflected on the balance sheets
Heating oil	Other current assets	$	300		$	5,103
Coal	Coal derivative assets	13,257			14,851
	Accrued expenses and other current liabilities	(766		)	(12		)
		$	12,791		$	19,942

Effects Of Derivatives On Measures Of Financial Performance

The effects of derivatives on measures of financial performance are as follows:

Derivatives used in Cash Flow Hedging Relationships (in thousands)

For the year ended December 31,



		Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion)									Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)
		2014			2013			2012			2014			2013			2012
Coal sales	⁽¹⁾	$	10,842		$	(338	)	7,690			$	5,336		$	3,664		$	2,675
Coal purchases	⁽²⁾	(5,097		)	526			(2,440		)	(2,693		)	(683		)	—
		$	5,745		$	188		$	5,250		$	2,643		$	2,981		$	2,675

Derivatives Not Designated as Hedging Instruments (in thousands)

For the year ended December 31,



		Gain (Loss) Recognized
		2014			2013			2012
Coal — unrealized	⁽³⁾	$	430		$	(12,700	)	$	8,272
Coal — realized	⁽⁴⁾	$	5,956		$	32,534		$	43,990
Heating oil — diesel purchases	⁽⁴⁾	$	(7,848	)	$	(9,791	)	$	(22,281	)
Heating oil — fuel surcharges	⁽⁴⁾	$	(405	)	$	(947	)	$	(2,209	)

Location in statement of operations:

(1) — Revenues

(2) — Cost of sales

(3) — Change in fair value of coal derivatives and coal trading activities, net

(4) — Other operating income, net

Accrued Expenses and Other Current Liabilities Accrued Expenses and Other Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2014

Accrued Expenses and Other Current Liabilities [Abstract]

Schedule of Accrued Liabilities

Accrued expenses and other current liabilities consist of the following:



	December 31,
	2014		2013
	(In thousands)
Payroll and employee benefits	$	73,362	$	67,621
Taxes other than income taxes	114,598		114,664
Interest	30,384		18,528
Acquired sales contracts	12,453		14,373
Workers’ compensation	16,714		12,434
Asset retirement obligations	19,222		24,940
Other	35,663		26,027
	$	302,396	$	278,587

Debt and Financing Arrangements (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Debt



	December 31,
	2014		2013
	(In thousands)
Term loan due 2018 ($1.9 billion and $1.93 billion face value, respectively)	$	1,890,846	$	1,906,975
7.00% senior notes due 2019 at par	1,000,000		1,000,000
8.00% senior secured notes due 2019 at par	350,000		350,000
9.875% senior notes ($375.0 million face value) due 2019	363,493		362,358
7.25% senior notes due 2020 at par	500,000		500,000
7.25% senior notes due 2021 at par	1,000,000		1,000,000
Other	56,031		32,162
	5,160,370		5,151,495
Less current maturities of debt	36,885		33,493
Long-term debt	$	5,123,485	$	5,118,002

Schedule of Maturities of Long-term Debt



Year
2015	$	36,915
2016	29,875
2017	30,091
2018	1,858,145
2019	1,730,670
Thereafter	1,500,960
	$	5,186,656

Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Taxes [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

Significant components of the provision for (benefit from) income taxes are as follows:



	Year Ended December 31
	2014		2013			2012
	(In thousands)
Current:
Federal	$	—	$	—		$	(20,022	)
State	25		(647		)	575
Total current	25		(647		)	(19,447		)
Deferred:
Federal	18,535		(318,956		)	(341,486		)
State	7,074		(15,895		)	7,026
Total deferred	25,609		(334,851		)	(334,460		)
	$	25,634	$	(335,498	)	$	(353,907	)

Schedule of Effective Income Tax Rate Reconciliation

A reconciliation of the statutory federal income tax provision (benefit) at the statutory rate to the actual provision for (benefit from) income taxes follows:



	Year Ended December 31
	2014			2013			2012
	(In thousands)
Income tax provision (benefit) at statutory rate	$	(186,452	)	$	(378,463	)	$	(382,581	)
Percentage depletion allowance	(12,692		)	(15,796		)	(33,654		)
Goodwill	—			70,301			56,916
State taxes, net of effect of federal taxes	(3,903		)	(25,265		)	(24,231		)
Change in valuation allowance	226,929			8,659			31,832
Other, net	1,752			5,066			(2,189		)
	$	25,634		$	(335,498	)	$	(353,907	)

Schedule of Deferred Tax Assets and Liabilities



	December 31,
	2014			2013
	(In thousands)
Deferred tax assets:
Net operating loss carryforwards	$	871,848		$	660,916
Alternative minimum tax credit carryforwards	127,169			126,755
Reclamation and mine closure	114,430			113,843
Goodwill	50,072			52,636
Workers' compensation	38,924			31,641
Share based compensation	30,283			28,494
Acquired sales contracts	26,833			33,392
Retiree benefit plans	22,913			20,527
Contract obligations	15,693			19,327
Other, primarily accrued liabilities	64,503			68,969
Gross deferred tax assets	1,362,668			1,156,500
Valuation allowance	(270,251		)	(43,322		)
Total deferred tax assets	1,092,417			1,113,178
Deferred tax liabilities:
Plant and equipment	1,354,396			1,364,382
Deferred development	95,129			91,126
Investment in tax partnerships	7,377			8,170
Other	5,533			13,902
Total deferred tax liabilities	1,462,435			1,477,580
Net deferred liability	370,018			364,402

Summary of Income Tax Contingencies

A reconciliation of the beginning and ending amounts of gross unrecognized tax benefits follows:



		(In thousands)
Balance at	January 1, 2012	$	8,798
Additions based on tax positions related to the current year		409
Additions for tax positions of prior years		21,943
Balance at	December 31, 2012	31,150
Additions based on tax positions related to the current year		1,199
Additions for tax positions of prior years		688
Reductions as a result of lapses in the statute of limitations		(1,248		)
Balance at	December 31, 2013	31,789
Additions for tax positions of the current year		2,920
Balance at	December 31, 2014	$	34,709

Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2014

Asset Retirement Obligation [Abstract]

Schedule of Change in Asset Retirement Obligation

The following table describes the changes to the Company's asset retirement obligation liability:



	Year Ended December 31,
	2014			2013
	(In thousands)
Balance at January 1 (including current portion)	$	427,653		$	448,625
Accretion expense	32,909			35,727
Obligations of divested operations	(30,684		)	(8,440		)
Adjustments to the liability from changes in estimates	627			(26,578		)
Liabilities settled	(12,387		)	(21,681		)
Balance at December 31	$	418,118		$	427,653
Current portion included in accrued expenses	(19,222		)	(24,940		)
Noncurrent liability	$	398,896		$	402,713

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2014

Fair Value Disclosures [Abstract]

Summary Of Financial Assets And Liabilities Accounted For At Fair Value

The table below sets forth, by level, the Company’s financial assets and liabilities that are recorded at fair value in the accompanying consolidated balance sheet:



	Fair Value at				December 31, 2014
	Total		Level 1			Level 2		Level 3
	(In thousands)
Assets:
Investments in marketable securities	$	254,099	$	5,145		$	248,954	$	—
Derivatives	13,557		9,026			1,491		3,040
Total assets	$	267,656	$	14,171		$	250,445	$	3,040
Liabilities:
Derivatives	$	766	$	—		$	766	$	—



	Fair Value at				December 31, 2013
	Total		Level 1			Level 2			Level 3
	(In thousands)
Assets:
Investments in marketable securities	$	264,443	$	77,967		$	186,476		$	—
Derivatives	19,954		14,847			—			5,107
Total assets	$	284,397	$	92,814		$	186,476		$	5,107
Liabilities:
Derivatives	$	12	$	—		$	(149	)	$	161

Summary Of Change In The Fair Values Of Financial Instruments Categorized As Level 3

The following table summarizes the change in the fair values of financial instruments categorized as level 3.



	Year Ended December 31,
	2014			2013
	(In thousands)
Balance, beginning of period	$	4,946		$	8,174
Realized and unrealized losses recognized in earnings, net	(6,572		)	(10,253		)
Purchases	5,288			8,654
Issuances	(622		)	(25		)
Settlements	—			(1,604		)
Ending balance	$	3,040		$	4,946

Stock-Based Compensation and Other Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2014

Share-based Compensation [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity

Information regarding stock option activity under the Incentive Plan follows for the year ended December 31, 2014:



			Weighted Average		Aggregate		Average
	Common		Exercise		Intrinsic		Remaining
	Shares		Price		Value		Life
	(In thousands)						(years)
Options outstanding at January 1	6,939		$	19.86
Canceled	(88	)	$	17.61
Expired	(29	)	$	29.84
Options outstanding at December 31	6,822		$	19.84	$	—	5.68
Options exercisable at December 31	5,123		$	24.01	—		5.01
Unvested options at December 31	1,699

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

Weighted average assumptions used in the Black-Scholes option pricing model for granted options follow:



	Year Ended December 31,
	2013		2012
Weighted average grant-date fair value per share of options granted	$	2.37	$	5.27
Assumptions (weighted average):
Risk-free interest rate	0.65%		0.76%
Expected dividend yield	2.30%		2.92%
Expected volatility	66.7%		60.7%
Expected life (in years)	4.5		4.5

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity

Information regarding restricted stock and restricted stock unit activity and weighted average grant-date fair value follows for the year ended December 31, 2014:



	Restricted Stock				Restricted Stock Units
			Weighted Average				Weighted Average
	Common		Grant-Date		Common		Grant-Date
	Shares		Fair Value		Shares		Fair Value
	(In thousands)				(In thousands)
Outstanding at January 1	143		$	27.52	1,373		$	7.95
Granted	—		—		1,521		4.51
Vested	(120	)	30.08		—		—
Canceled	(1	)	32.49		(70	)	6.34
Outstanding at December 31	22		13.44		2,824		6.14

Workers' Compensation Expense (Tables)

12 Months Ended

Dec. 31, 2014

Workers' Compensation Expense [Abstract]

Workers' compensation liabilities



	December 31,
	2014		2013
	(In thousands)
Occupational disease costs	$	72,749	$	55,228
Traumatic and other workers' compensation claims	38,256		35,268
Total obligations	111,005		90,496
Less amount included in accrued expenses	16,714		12,434
Noncurrent obligations	$	94,291	$	78,062

Workers' Compensation Expense



		Year Ended December 31,
		2014		2013		2012
	(In thousands)
Total occupational disease		4,432		6,137		6,962
Traumatic injury claims and assessments		19,924		21,089		26,565
Total workers’ compensation expense		$	24,356	$	27,226	$	33,527

Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2014

Pension and Other Postretirement Benefit Expense [Abstract]

Pension Benefit Costs

Summaries of the changes in the benefit obligations, plan assets and funded status of the plans are as follows:



							Other Postretirement
	Pension Benefits						Benefits
	2014			2013			2014			2013
	(In thousands)
CHANGE IN BENEFIT OBLIGATIONS
Benefit obligations at January 1	$	355,468		$	390,894		$	42,531		$	49,326
Service cost	21,478			27,065			1,649			2,027
Interest cost	17,070			16,207			1,841			1,739
Plan amendments	(23		)	—			—			—
Curtailments	(25,787		)	(3,027		)	—			(2,519		)
Benefits paid	(53,974		)	(41,562		)	(3,431		)	(3,276		)
Other-primarily actuarial loss (gain)	39,504			(34,109		)	(6,492		)	(4,766		)
Benefit obligations at December 31	$	353,736		$	355,468		$	36,098		$	42,531
CHANGE IN PLAN ASSETS
Value of plan assets at January 1	$	347,952		$	322,874		$	—		$	—
Actual return on plan assets	36,130			52,247			—			—
Employer contributions	6,601			14,393			3,431			3,276
Benefits paid	(53,974		)	(41,562		)	(3,431		)	(3,276		)
Value of plan assets at December 31	$	336,709		$	347,952		$	—		$	—
Accrued benefit cost	$	(17,027	)	$	(7,516	)	$	(36,098	)	$	(42,531	)
ITEMS NOT YET RECOGNIZED AS A COMPONENT OF NET PERIODIC BENEFIT COST
Prior service credit (cost)	$	—		$	1,732		$	21,972		$	31,925
Accumulated gain (loss)	(11,332		)	10,096			9,125			3,394
	$	(11,332	)	$	11,828		$	31,097		$	35,319
BALANCE SHEET AMOUNTS
Current liability	$	(767	)	$	(405	)	$	(3,430	)	$	(3,276	)
Noncurrent liability	$	(16,260	)	$	(7,111	)	$	(32,668	)	$	(39,255	)
	$	(17,027	)	$	(7,516	)	$	(36,098	)	$	(42,531	)

Other Postretirement Benefit Costs Table Text Block



	Pension Benefits									Other Postretirement Benefits
	Year Ended December 31,									Year Ended December 31,
	2014			2013			2012			2014			2013			2012
	(In thousands)
Service cost	$	21,478		$	27,065		$	27,466		$	1,649		$	2,027		$	2,142
Interest cost	17,070			16,207			15,668			1,841			1,739			2,020
Curtailments	(25,368		)	47			324			—			(5,444		)	(4,049		)
Settlements	646			—			—			—			—			—
Expected return on plan assets	(23,756		)	(23,761		)	(22,030		)	—			—			—
Amortization of prior service credits	(257		)	(204		)	259			(10,003		)	(10,621		)	(11,458		)
Amortization of other actuarial losses	3,128			14,616			14,666			(761		)	(252		)	(522		)
Net benefit cost (credit)	$	(7,059	)	$	33,970		$	36,353		$	(7,274	)	$	(12,551	)	$	(11,867	)

Schedule of Assumptions Used

Assumptions. The following table provides the weighted average assumptions used to determine the actuarial present value of projected benefit obligations at December 31 of the respective years.



	Pension Benefits		Other Postretirement Benefits
	2014	2013	2014	2013

Discount rate	4.15%	5.08%	3.91%	4.58%
Rate of compensation increase	N/A	3.39%	N/A	N/A

The following table provides the weighted average assumptions used to determine net periodic benefit cost for the respective years ended December 31.



	Pension Benefits							Other Postretirement Benefits
	2014			2013			2012	2014	2013		2012

Discount rate	5.08/	4.23/	4.14%	4.13	/	5.05%	4.91%	4.58%	3.64/	4.58%	4.52%
Rate of compensation increase	3.39%			3.39%			3.39%	N/A	N/A		N/A
Expected return on plan assets	7.75%			7.75%			7.75%	N/A	N/A		N/A

Schedule of Allocation of Plan Assets

The Company's pension plan assets at December 31, 2014 and 2013, respectively, are categorized below according to the fair value hierarchy as defined in Note 16, "Fair Value Measurements":



	Total				Level 1				Level 2				Level 3
	2014		2013		2014		2013		2014		2013		2014		2013
	(In thousands)
Equity Securities:^(A)
U.S. small-cap	$	16,512	$	14,901	$	16,512	$	14,901	$	—	$	—	$	—	$	—
U.S. mid-cap	46,481		62,271		17,301		28,654		29,180		33,617		—		—
U.S. large-cap	89,008		110,947		43,181		53,708		45,827		57,239		—		—
Non-U.S.	25,905		29,165		—		—		25,905		29,165		—		—
Fixed income securities:
U.S. government securities^(B)	13,708		18,545		12,988		17,714		720		831		—		—
Non-U.S. government securities^(C)	1,599		2,143		—		—		1,599		2,143		—		—
U.S. government asset and mortgage backed securities^(D)	830		600		—		—		830		600		—		—
Corporate fixed income^(E)	22,702		9,902		—		—		22,702		9,902		—		—
State and local government securities^(F)	8,005		8,301		—		—		8,005		8,301		—		—
Other fixed income^(G)	83,735		58,093		—		—		83,735		58,093		—		—
Short-term investments^(H)	6,818		14,663		—		—		6,818		14,663		—		—
Other investments^(I)	21,406		18,421		—		—		3,336		1,404		18,070		17,017
Total	$	336,709	$	347,952	$	89,982	$	114,977	$	228,657	$	215,958	$	18,070	$	17,017

^(B)U.S. government securities includes agency and treasury debt. These investments are valued using dealer quotes in an active market.

^(G) Other fixed income investments are actively managed fixed income vehicles that are valued at the net asset value per share multiplied by the number of shares held as of the measurement date.

Schedule of Expected Benefit Payments

The following represents expected future benefit payments from the plan, which reflect expected future service, as appropriate:



			Other
	Pension		Postretirement
	Benefits		Benefits
	(In thousands)
2015	$	17,737	$	3,665
2016	20,544		3,657
2017	22,503		3,551
2018	24,086		3,486
2019	22,943		3,421
Next 5 years	130,088		14,680
	$	237,901	$	32,460

Leases (Tables)

12 Months Ended

Dec. 31, 2014

Leases [Abstract]

Operating Leases of Lessee Disclosure

Minimum payments due in future years under these agreements in effect at December 31, 2014 are as follows:



	Operating
	Leases		Royalties
	(In thousands)
2015	$	25,685	$	14,587
2016	19,242		18,632
2017	17,065		17,932
2018	6,334		17,584
2019	3,370		13,875
Thereafter	11,880		83,282
	$	83,576	$	165,892

- Definition

Tabular disclosure of a lessee's leasing arrangements including: (1) the basis on which contingent rental payments are determined, (2) the existence and terms of renewal or purchase options and escalation clauses, (3) restrictions imposed by lease arrangements, such as those concerning dividends, additional debt, and further leasing, (4) rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. Disclosure may also include the specific period used to amortize material leasehold improvements made at the inception of the lease or during the lease term. Additionally, for operating leases having initial or remaining noncancelable lease terms in excess of one year: (a) future minimum rental payments required as of the date of the latest balance sheet presented, in the aggregate and for each of the five succeeding fiscal years, (b) the total of minimum rentals to be received in the future under noncancelable subleases as of the date of the latest balance sheet presented, and (c) for all operating leases, rental expense for each period for which an income statement is presented, with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included.

+ References + Details

Risk Concentrations (Tables)

12 Months Ended

Dec. 31, 2014

Risks Concentrations [Abstract]

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas

The Company's foreign revenues by geographical location are as follows:



	Year Ended December 31,
	2014		2013		2012
	(In thousands)
Europe	$	277,565	$	371,363	$	674,754
Asia	156,057		160,404		203,193
North America	78,445		80,322		72,542
Central and South America	20,496		55,493		57,184
Brokered Sales	79,354		154,442		145,438
Total	$	611,917	$	822,024	$	1,153,111

Segment Information (Tables)

12 Months Ended

Dec. 31, 2014

Segment Reporting [Abstract]

Schedule Of Operating Segment Results



		PRB			APP			All Other		Corporate, Other and Eliminations			Consolidated
Year Ended	December 31, 2014
Revenues		$	1,490,377		$	1,108,358		$	338,384	$	—		$2,937,119
Adjusted EBITDA		198,074			110,693			56,612		(85,236		)	280,143
Depreciation, depletion and amortization		168,522			205,732			40,125		4,369			418,748
Amortization of acquired sales contracts, net		(3,961		)	(9,433		)	207		—			(13,187		)
Total assets		1,772,230			3,379,834			339,809		2,937,850			8,429,723
Capital expenditures		44,305			23,638			12,993		66,350			147,286

Year Ended	December 31, 2013
Revenues		$	1,482,812		$	1,145,801		$	385,744	$	—		$	3,014,357
Adjusted EBITDA		206,910			88,883			94,948		(138,595		)	252,146
Depreciation, depletion and amortization		171,324			202,952			45,741		6,425			426,442
Amortization of acquired sales contracts, net		(3,656		)	(10,364		)	4,563		—			(9,457		)
Total assets		1,841,835			3,971,764			402,922		2,773,672			8,990,193
Capital expenditures		9,784			167,759			23,122		96,319			296,984

Year Ended	December 31, 2012
Revenues		$	1,524,536		$	1,793,576		$	450,014	$	—		$	3,768,126
Adjusted EBITDA		262,155			405,981			112,982		(201,246		)	579,872
Depreciation, depletion and amortization		166,539			271,221			49,911		4,540			492,211
Amortization of acquired sales contracts, net		(1,987		)	(23,926		)	724		—			(25,189		)
Total assets		1,972,522			3,875,105			834,287		3,324,863			10,006,777
Capital expenditures		23,410			275,476			68,220		28,119			395,225

Reconciliation Statement Of Segment Income From Operations To Consolidated Income Before Income Taxes

A reconciliation of segment losses to consolidated loss from continuing operations before income taxes follows:



	Year Ended December 31,
	2014			2013			2012

Adjusted EBITDA	$	280,143		$	252,146		$	579,872
Depreciation, depletion and amortization	(418,748		)	(426,442		)	(492,211		)
Amortization of acquired sales contracts, net	13,187			9,457			25,189
Asset impairment costs	(24,113		)	(220,879		)	(539,182		)
Goodwill impairment	—			(265,423		)	(330,680		)
Settlement of UMWA legal claims	—			(12,000		)	—
Interest expense, net	(383,188		)	(374,664		)	(312,142		)
Nonoperating expense	—			(42,921		)	(23,668		)
Loss from continuing operations before income taxes	$	(532,719	)	$	(1,080,726	)	$	(1,092,822	)

Quarterly Selected Financial Data (Tables)

12 Months Ended

Dec. 31, 2014

Quarterly Financial Information [Abstract]

Schedule of Quarterly Financial Information



Year Ended	December 31, 2014	March 31			June 30			September 30			December 31
		(a)			(a) (c)			(a) (c)			(a) (c)
		(In thousands, except per share data)

Revenues		$	735,971		$	713,776		$	742,180		$	745,192
Gross profit (loss)		$	(49,842	)	$	(6,350	)	$	(5,851	)	$	32,264
Asset impairment and mine closure costs		$	—		$	1,512		$	5,060		$	17,541
Loss from operations		$	(73,123	)	$	(35,805	)	$	(35,300	)	$	(5,303	)
Net loss		$	(124,140	)	$	(96,860	)	$	(97,218	)	$	(240,135	)
Diluted loss per common share		$	(0.59	)	$	(0.46	)	$	(0.46	)	$	(1.13	)



Year Ended	December 31, 2013	March 31			June 30			September 30			December 31
		(a)			(a)			(a)			(a)
		(In thousands, except per share data)

Revenues		$	737,370		$	766,332		$	791,269		$	719,386
Gross profit (loss)		$	(18,560	)	$	2,505		$	90		$	(44,801	)
Asset impairment and mine closure costs		$	—		$	20,482		$	200,397		$	—
Goodwill impairment		$	—		$	—		$	—		$	265,423
Loss from operations		$	(51,431	)	$	(36,279	)	$	(234,753	)	$	(340,678	)
Loss from continuing operations		$	(84,316	)	$	(80,351	)	$	(207,767	)	$	(372,794	)
Income from discontinued operations, net of tax^(b)		$	14,267		$	8,145		$	79,404		$	1,580
Net loss		$	(70,049	)	$	(72,206	)	$	(128,363	)	$	(371,214	)
Diluted loss per common share from:
Income (loss) from continuing operations		$	(0.40	)	$	(0.38	)	$	(0.98	)	$	(1.76	)
Net loss		$	(0.33	)	$	(0.34	)	$	(0.61	)	$	(1.75	)

Supplemental Consolidating Financial Information (Tables)

12 Months Ended

Dec. 31, 2014

Supplemental Condensed Consolidating Financial Information [Abstract]

Schedule of Condensed Consolidating Statements of Income

Condensed Consolidating Statements of Operations and Comprehensive Income

Year Ended December 31, 2014



	Parent/Issuer			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
	(In thousands)
Revenues	$	—		$	2,937,119		$	—		$	—		$	2,937,119
Costs, expenses and other
Cost of sales (exclusive of items shown separately below)	3,016			2,566,572			—			(3,395		)	2,566,193
Depreciation, depletion and amortization	5,154			413,559			35			—			418,748
Amortization of acquired sales contracts, net	—			(13,187		)	—			—			(13,187		)
Change in fair value of coal derivatives and coal trading activities, net	—			(3,686		)	—			—			(3,686		)
Asset impairment and mine closure costs	3,642			20,471			—			—			24,113
Selling, general and administrative expenses	79,902			29,739			6,626			(2,044		)	114,223
Other operating income, net	(4,480		)	(15,726		)	(4,987		)	5,439			(19,754		)
	87,234			2,997,742			1,674			—			3,086,650
Loss from investment in subsidiaries	(13,085		)	—			—			13,085			—
Loss from operations	(100,319		)	(60,623		)	(1,674		)	13,085			(149,531		)
Interest expense, net
Interest expense	(463,823		)	(26,137		)	(4,259		)	103,273			(390,946		)
Interest and investment income	31,389			74,511			5,131			(103,273		)	7,758
	(432,434		)	48,374			872			—			(383,188		)

Loss from continuing operations before income taxes	(532,753		)	(12,249		)	(802		)	13,085			(532,719		)
Provision for (benefit from) income taxes	25,600			—			34			—			25,634
Net loss	(558,353		)	(12,249		)	(836		)	13,085			(558,353		)
Total comprehensive loss	$	(592,804	)	$	(34,439	)	$	(836	)	$	35,275		$	(592,804	)

Condensed Consolidating Statements of Operations and Comprehensive Income

Year Ended December 31, 2013



	Parent/Issuer			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
	(In thousands)
Revenues	$	—		$	3,014,357		$	—		$	—		$	3,014,357
Costs, expenses and other
Cost of sales (exclusive of items shown separately below)	9,117			2,657,583			—			(3,564		)	2,663,136
Depreciation, depletion and amortization	5,949			420,458			35			—			426,442
Amortization of acquired sales contracts, net	—			(9,457		)	—			—			(9,457		)
Change in fair value of coal derivatives and coal trading activities, net	—			7,845			—			—			7,845
Asset impairment and mine closure costs	78,150			142,729			—			—			220,879
Goodwill impairment	—			265,423			—			—			265,423
Selling, general and administrative expenses	88,820			39,825			7,038			(2,235		)	133,448
Other operating income, net	4,209			(34,856		)	(5,370		)	5,799			(30,218		)
	186,245			3,489,550			1,703			—			3,677,498
Loss from investment in subsidiaries	(328,889		)	—			—			328,889			—
Loss from operations	(515,134		)	(475,193		)	(1,703		)	328,889			(663,141		)
Interest expense, net
Interest expense	(449,614		)	(24,747		)	(4,214		)	97,308			(381,267		)
Interest and investment income	30,285			68,248			5,378			(97,308		)	6,603
	(419,329		)	43,501			1,164			—			(374,664		)

Net loss resulting from early retirement and refinancing of debt	(42,921		)	—			—			—			(42,921		)
Loss from continuing operations before income taxes	(977,384		)	(431,692		)	(539		)	328,889			(1,080,726		)
Provision for (benefit from) income taxes	(335,552		)	—			54			—			(335,498		)
Loss from continuing operations	(641,832		)	(431,692		)	(593		)	328,889			(745,228		)
Income from discontinued operations, including gain on sale - net of tax	—			103,396			—			—			103,396
Net loss	$	(641,832	)	$	(328,296	)	$	(593	)	$	328,889		$	(641,832	)
Total comprehensive loss	$	(587,633	)	$	(304,278	)	$	(593	)	$	304,871		$	(587,633	)

Condensed Consolidating Statements of Operations and Comprehensive Income

Year Ended December 31, 2012



	Parent/Issuer			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
	(In thousands)
Revenues	$	—		$	3,768,126		$	—		$	—		$	3,768,126
Costs, expenses and other													—
Cost of sales (exclusive of items shown separately below)	10,921			3,144,178			—			—			3,155,099
Depreciation, depletion and amortization	5,392			486,786			33			—			492,211
Amortization of acquired sales contracts, net	—			(25,189		)	—			—			(25,189		)
Change in fair value of coal derivatives and coal trading activities, net	—			(16,590		)	—			—			(16,590		)
Asset impairment and mine closure costs	—			539,182			—			—			539,182
Goodwill impairment	—			330,680			—			—			330,680
Contract settlement resulting from Patriot Coal bankruptcy	—			58,335			—			—			58,335
Reduction in accrual related to acquired litigation	—			(79,532		)	—			—			(79,532		)
Selling, general and administrative expenses	84,199			44,363			8,785			(3,048		)	134,299
Other operating income, net	(13,392		)	(39,209		)	(13,804		)	3,048			(63,357		)
	87,120			4,443,004			(4,986		)	—			4,525,138
Loss from investment in subsidiaries	(589,665		)	—			—			589,665			—
Income (loss) from operations	(676,785		)	(674,878		)	4,986			589,665			(757,012		)
Interest expense, net
Interest expense	(366,584		)	(34,849		)	(3,221		)	87,039			(317,615		)
Interest and investment income	27,750			57,268			7,494			(87,039		)	5,473
	(338,834		)	22,419			4,273			—			(312,142		)
Other non-operating expense
Net loss resulting from early retirement of debt	(21,975		)	(1,693		)	—			—			(23,668		)

Income (loss) from continuing operations before income taxes	(1,037,594		)	(654,152		)	9,259			589,665			(1,092,822		)
Provision for (benefit from) income taxes	(353,907		)	—			—			—			(353,907		)
Income (loss) from continuing operations	(683,687		)	(654,152		)	9,259			589,665			(738,915		)
Income from discontinued operations, net of tax	—			55,228			—			—			55,228
Net Income (loss)	(683,687		)	(598,924		)	9,259			589,665			(683,687		)
Less: Net income attributable to noncontrolling interest	(268		)	—			—			—			(268		)
Net Income (loss) attributable to Arch Coal, Inc.	$	(683,955	)	$	(598,924	)	$	9,259		$	589,665		$	(683,955	)
Total comprehensive income (loss)	$	(692,239	)	$	(604,903	)	$	9,259		$	595,644		$	(692,239	)

Schedule of Condensed Consolidating Balance Sheets

Condensed Consolidating Balance Sheets

December 31, 2014



	Parent/Issuer		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated
	(In thousands)
Assets
Cash and cash equivalents	$	572,185	$	150,358	$	11,688	$	—		$	734,231
Short term investments	248,954		—		—		—			248,954
Receivables	9,656		15,933		211,043		(4,615		)	232,017
Inventories	—		190,253		—		—			190,253
Other	89,211		41,455		6,630		—			137,296
Total current assets	920,006		397,999		229,361		(4,615		)	1,542,751

Property, plant and equipment, net	10,470		6,442,623		2		363			6,453,458

Investment in subsidiaries	7,464,221		—		—		(7,464,221		)	—
Intercompany receivables	—		2,021,110		—		(2,021,110		)	—
Note receivable from Arch Western	675,000		—		—		(675,000		)	—
Other	131,884		300,058		1,572		—			433,514
Total assets	$	9,201,581	$	9,161,790	$	230,935	$	(10,164,583	)	$	8,429,723

Liabilities and Stockholders’ Equity
Accounts payable	$	23,394	$	156,664	$	55	$	—		$	180,113
Accrued expenses and other current liabilities	85,899		220,017		1,095		(4,615		)	302,396
Current maturities of debt	27,625		9,260		—		—			36,885
Total current liabilities	136,918		385,941		1,150		(4,615		)	519,394
Long-term debt	5,084,839		38,646		—		—			5,123,485
Intercompany payables	1,817,755		—		203,355		(2,021,110		)	—
Note payable to Arch Coal	—		675,000		—		(675,000		)	—
Asset retirement obligations	981		397,915		—		—			398,896
Accrued pension benefits	5,967		10,293		—		—			16,260
Accrued postretirement benefits other than pension	4,430		28,238		—		—			32,668
Accrued workers’ compensation	9,172		85,119		—		—			94,291
Deferred income taxes	422,809		—		—		—			422,809
Other noncurrent liabilities	50,919		102,461		386		—			153,766
Total liabilities	7,533,790		1,723,613		204,891		(2,700,725		)	6,761,569
Stockholders’ equity	1,667,791		7,438,177		26,044		(7,463,858		)	1,668,154
Total liabilities and stockholders’ equity	$	9,201,581	$	9,161,790	$	230,935	$	(10,164,583	)	$	8,429,723

Condensed Consolidating Balance Sheets

December 31, 2013



	Parent/Issuer		Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Eliminations			Consolidated
	(In thousands)
Assets
Cash and cash equivalents	$	799,333	$	100,418		$	11,348	$	—		$	911,099
Short term investments	248,414		—			—		—			248,414
Receivables	14,177		23,018			197,015		(4,637		)	229,573
Inventories	—		264,161			—		—			264,161
Other	84,401		43,617			806		—			128,824
Total current assets	1,146,325		431,214			209,169		(4,637		)	1,782,071

Property, plant and equipment, net	24,851		6,709,398			37		—			6,734,286

Investment in subsidiaries	7,741,589		—			—		(7,741,589		)	—
Intercompany receivables			1,953,719			—		(1,953,719		)	—
Note receivable from Arch Western	675,000		—			—		(675,000		)	—
Other	162,287		311,463			86		—			473,836
Total other assets	8,578,876		2,265,182			86		(10,370,308		)	473,836
Total assets	$	9,750,052	$	9,405,794		$	209,292	$	(10,374,945	)	$	8,990,193

Liabilities and Stockholders’ Equity
Accounts payable	$	17,781	$	158,224		$	137	$	—		$	176,142
Accrued expenses and other current liabilities	53,779		228,664			781		(4,637		)	278,587
Current maturities of debt	28,882		4,611			—		—			33,493
Total current liabilities	100,442		391,499			918		(4,637		)	488,222
Long-term debt	5,099,833		18,169			—					5,118,002
Intercompany payables	1,772,624		—			181,095		(1,953,719		)	—
Note payable to Arch Coal	—		675,000			—		(675,000		)	—
Asset retirement obligations	1,095		401,618			—		—			402,713
Accrued pension benefits	7,797		(686		)	—		—			7,111
Accrued postretirement benefits other than pension	12,079		27,176			—		—			39,255
Accrued workers’ compensation	21,546		56,516			—		—			78,062
Deferred income taxes	413,546		—			—		—			413,546
Other noncurrent liabilities	67,841		121,794			398		—			190,033
Total liabilities	7,496,803		1,691,086			182,411		(2,633,356		)	6,736,944
Stockholders’ equity	2,253,249		7,714,708			26,881		(7,741,589		)	2,253,249
Total liabilities and stockholders’ equity	$	9,750,052	$	9,405,794		$	209,292	$	(10,374,945	)	$	8,990,193

Schedule of Condensed Consolidating Statements of Cash Flows

Condensed Consolidating Statements of Cash Flows

Year Ended December 31, 2014



	Parent/Issuer			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations		Consolidated
	(In thousands)
Cash provided by (used in) operating activities	$	(324,688	)	$	305,048		$	(13,942	)	$	—	$	(33,582	)
Investing Activities
Capital expenditures	(2,700		)	(144,586		)	—			—		(147,286		)
Additions to prepaid royalties	—			(7,317		)	—			—		(7,317		)
Proceeds from disposals and divestitures	57,625			4,733			—			—		62,358
Purchases of short term investments	(211,929		)	—			—			—		(211,929		)
Proceeds from sales of short term investments	205,611			—			—			—		205,611
Proceeds from sales of investments in equity securities	9,464			—			—			—		9,464
Investments in and advances to affiliates	(2,541		)	(14,116		)	—			—		(16,657		)
Cash provided by (used in) investing activities	55,530			(161,286		)	—			—		(105,756		)
Financing Activities
Payments on term loan	(19,500		)	—			—			—		(19,500		)
Net payments on other debt	(1,258		)	(4,437		)	—			—		(5,695		)
Debt financing costs	(2,219		)	—			(2,300		)	—		(4,519		)
Dividends paid	(2,123		)	—			—			—		(2,123		)
Other	(15		)	—			(5,678		)	—		(5,693		)
Transactions with affiliates, net	67,125			(89,385		)	22,260			—		—
Cash provided by (used in) financing activities	42,010			(93,822		)	14,282			—		(37,530		)
Increase (decrease) in cash and cash equivalents	(227,148		)	49,940			340			—		(176,868		)
Cash and cash equivalents, beginning of period	799,333			100,418			11,348			—		911,099
Cash and cash equivalents, end of period	$	572,185		$	150,358		$	11,688		$	—	$	734,231

Condensed Consolidating Statements of Cash Flows

Year Ended December 31, 2013



	Parent/Issuer			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	(In thousands)
Cash provided by (used in) operating activities	$	(632,060	)	$	637,193		$	50,609		$	—		$	55,742
Investing Activities
Capital expenditures	(3,320		)	(293,664		)	—			—			(296,984		)
Additions to prepaid royalties	—			(14,947		)	—			—			(14,947		)
Proceeds from disposals and divestitures	—			433,453			—			—			433,453
Proceeds from sales-leaseback transactions	—			34,919			—			—			34,919
Purchases of short term investments	(213,726		)	—			—			—			(213,726		)
Proceeds from sales of short term investments	194,537			—			—			—			194,537
Investments in and advances to affiliates	(5,451		)	(10,321		)	—			512			(15,260		)
Change in restricted cash	3,453			—			—			—			3,453
Cash provided by (used in) investing activities	(24,507		)	149,440			—			512			125,445
Financing Activities
Contributions from parent	—			512			—			(512		)	—
Proceeds from term loan and senior notes	644,000			—			—			—			644,000
Payments to retire debt	(628,660		)	—			—			—			(628,660		)
Payments on term loan	(17,250		)	—			—			—			(17,250		)
Net payments on other debt	(6,324		)	(512		)	—			—			(6,836		)
Debt financing costs	(19,864		)	—			(625		)	—			(20,489		)
Dividends paid	(25,475		)	—			—			—			(25,475		)
Transactions with affiliates, net	838,160			(786,683		)	(51,477		)	—			—
Cash provided by (used in) financing activities	784,587			(786,683		)	(52,102		)	(512		)	(54,710		)
Increase (decrease) in cash and cash equivalents	128,020			(50		)	(1,493		)	—			126,477
Cash and cash equivalents, beginning of period	671,313			100,468			12,841			—			784,622
Cash and cash equivalents, end of period	$	799,333		$	100,418		$	11,348		$	—		$	911,099

Condensed Consolidating Statements of Cash Flows

Year Ended December 31, 2012



	Parent/Issuer			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	(In thousands)
Cash provided by (used in) operating activities	$	(571,576	)	$	781,551		$	122,829		$	—		$	332,804
Investing Activities
Change in restricted cash	6,869			—			—			—			6,869
Capital expenditures	(4,424		)	(390,801		)	—			—			(395,225		)
Proceeds from disposals and divestitures	—			1,328			21,497			—			22,825
Investments in and advances to affiliates	(6,287		)	(13,134		)	—			1,663			(17,758		)
Purchases of short term investments	(236,862		)	—			—			—			(236,862		)
Proceeds from sales of short term investments	1,754			—			—			—			1,754
Purchase of noncontrolling interest	(17,500		)	—			—			—			(17,500		)
Additions to prepaid royalties	—			(13,269		)	—			—			(13,269		)
Cash provided by (used in) investing activities	(256,450		)	(415,876		)	21,497			1,663			(649,166		)
Financing Activities
Contributions from parent	—			1,663			—			(1,663		)	—
Proceeds from term loan and senior notes	1,993,253			—			—			—			1,993,253
Payments to retire debt	—			(452,934		)	—			—			(452,934		)
Net decrease in borrowings under lines of credit and commercial paper program	(375,000		)	—			(106,300		)	—			(481,300		)
Payments on term loan	(7,625		)	—			—			—			(7,625		)
Net payments on other debt	(682		)	—			—			—			(682		)
Debt financing costs	(50,022		)	—			(546		)	—			(50,568		)
Dividends paid	(42,440		)	—			—			—			(42,440		)
Issuance of common stock under incentive plans	5,131			—			—			—			5,131
Transactions with affiliates, net	(84,651		)	110,639			(25,988		)	—			—
Cash provided by (used in) financing activities	1,437,964			(340,632		)	(132,834		)	(1,663		)	962,835
Increase in cash and cash equivalents	609,938			25,043			11,492			—			646,473
Cash and cash equivalents, beginning of period	61,375			75,425			1,349			—			138,149
Cash and cash equivalents, end of period	$	671,313		$	100,468		$	12,841		$	—		$	784,622

Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
Accounting Policies (Narrative) (Details) $ in Thousands	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Statutory Accounting Practices
Interest Costs Capitalized		$ 15,900	$ 15,600
Mineral Rights	$ 4,700,000	4,800,000
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months	265,600
Unrecorded Unconditional Purchase Obligation, Due within Two Years	118,100
Deferred Finance Costs, Net	89,066	99,185
Deferred Finance Costs, Current, Net	$ 25,500	$ 19,700
number of mining complexes temporarily idled	1
Exploration and Production Equipment [Member] \| Minimum [Member]
Statutory Accounting Practices
Property, Plant and Equipment, Useful Life	5 years
Exploration and Production Equipment [Member] \| Maximum [Member]
Statutory Accounting Practices
Property, Plant and Equipment, Useful Life	32 years
Building and Building Improvements [Member] \| Minimum [Member]
Statutory Accounting Practices
Property, Plant and Equipment, Useful Life	10 years
Building and Building Improvements [Member] \| Maximum [Member]
Statutory Accounting Practices
Property, Plant and Equipment, Useful Life	30 years
Mining Properties and Mineral Rights [Member] \| Minimum [Member]
Statutory Accounting Practices
Lessee Leasing Arrangements, Operating Leases, Term of Contract	10 years
Mining Properties and Mineral Rights [Member] \| Maximum [Member]
Statutory Accounting Practices
Lessee Leasing Arrangements, Operating Leases, Term of Contract	50 years
Capital Addition Purchase Commitments [Member]
Statutory Accounting Practices
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months	$ 75,400
Unrecorded Unconditional Purchase Obligation, Due within Two Years	$ 60,000

Divestitures (Schedule of Results of Discontinued Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Discontinued Operations and Disposal Groups [Abstract]
Disposal Group, Including Discontinued Operation, Inventory, Current	$ 33,730					$ 33,730
Disposal Group, Including Discontinued Operation, Assets, Current	2,060					2,060
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment	35,560					35,560
Disposal Group, Including Discontinued Operation, Assets, Noncurrent	190					190
Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities	10,599					10,599
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent	38,340					38,340
Total Revenues						219,002	$ 390,912
Income from discontinued operations before income taxes						32,167	75,418
Gain on sale					$ 27,512	120,321	0
Less: income tax expense						49,092	20,190
Income from discontinued operations, including gain on sale - net of tax	$ 1,580	$ 79,404	$ 8,145	$ 14,267	$ 0	$ 103,396	$ 55,228
Basic earnings per common share from discontinued operations						$ 0.49	$ 0.26
Diluted earnings per common share from discontinued operations						$ 0.49	$ 0.26

Divestitures (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Divestitures (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]
Proceeds from disposals and divestitures	$ 46,711	$ 422,731
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	$ 17,800

Accumulated Other Comprehensive Income (Loss) (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprenhensive Income (Loss) [Roll Forward]
Balance at	$ 37,692	$ (16,507)
Unrealized gains (losses)	(24,566)	54,585
Amounts reclassified from accumulated other comprehensive income (loss)	(9,885)	(386)
Balance at	3,241	37,692
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprenhensive Income (Loss) [Roll Forward]
Balance at	565	2,244
Unrealized gains (losses)	3,677	168
Amounts reclassified from accumulated other comprehensive income (loss)	(1,692)	(1,847)
Balance at	2,550	565
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprenhensive Income (Loss) [Roll Forward]
Balance at	31,112	(18,286)
Unrealized gains (losses)	(22,516)	48,482
Amounts reclassified from accumulated other comprehensive income (loss)	(5,736)	916
Balance at	2,860	31,112
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprenhensive Income (Loss) [Roll Forward]
Balance at	6,015	(465)
Unrealized gains (losses)	(5,727)	5,935
Amounts reclassified from accumulated other comprehensive income (loss)	(2,457)	545
Balance at	$ (2,169)	$ 6,015

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References + Details

Accumulated Other Comprehensive Income (Loss) (Schedule of Reclassifications) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Revenues	$ 745,192	$ 742,180	$ 713,776	$ 735,971	$ 719,386	$ 791,269	$ 766,332	$ 737,370	$ 2,937,119	$ 3,014,357	$ 3,768,126
Loss from continuing operations before income taxes									(532,719)	(1,080,726)	(1,092,822)
Provision for (benefit from) income taxes									(25,634)	335,498	353,907
Net income (loss)	$ (240,135)	$ (97,218)	$ (96,860)	$ (124,140)	$ (371,214)	$ (128,363)	$ (72,206)	$ (70,049)	(558,353)	(641,832)	$ (683,687)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									9,885	386
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									1,692	1,847
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									5,736	(916)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax									2,457	(545)
Reclassification out of accumulated other comprehensive income [Member] \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] \| Commodity Contract [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Revenues									2,643	2,886
Provision for (benefit from) income taxes									(951)	(1,039)
Net income (loss)									1,692	1,847
Reclassification out of accumulated other comprehensive income [Member] \| Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of prior service credits									11,760	13,705
Amortization of net actuarial gains (losses)									(2,797)	(15,136)
Loss from continuing operations before income taxes									8,963	(1,431)
Provision for (benefit from) income taxes									(3,227)	515
Net income (loss)									5,736	(916)
Reclassification out of accumulated other comprehensive income [Member] \| Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest and investment income									3,838	(852)
Provision for (benefit from) income taxes									(1,381)	307
Net income (loss)									$ 2,457	$ (545)

Impairment Charges and Mine Closure Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012
Impaired Long-Lived Assets Held and Used [Line Items]
Restructuring Charges	$ 5.1
Impairment Charge	15.4
Inventory Write-down		$ 2.6
Impairment of Long-Lived Assets Held-for-use	142.8
Severance Costs		12.3
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments		(1.8)
Restructuring and Related Cost, Incurred Cost		523.5
Assets, Fair Value Disclosure, Nonrecurring	$ 71.3
Productive Land [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of Long-Lived Assets Held-for-use		403.3
Machinery and Equipment [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of Long-Lived Assets Held-for-use		95.6
Mining Properties and Mineral Rights [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of Intangible Assets, Finite-lived		$ 11.5

Goodwill (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
Goodwill (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Goodwill impairment	$ 0	$ 0	$ 0	$ 0	$ 265,423	$ 330,680
Black Thunder [Member]
Goodwill [Line Items]
Goodwill impairment						115,800
APP [Member]
Goodwill [Line Items]
Goodwill impairment					$ 265,400	$ 214,900

Goodwill (Schedule of Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Roll Forward]
Balance			$ 265,423	$ 0	$ 265,423	$ 596,103
Goodwill impairment	$ 0	$ 0	$ 0	$ 0	(265,423)	(330,680)
Balance					$ 0	$ 265,423

Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Inventory Disclosure [Abstract]
Coal	$ 71,901	$ 117,531
Repair parts and supplies	118,352	137,497
Work-in-process	0	9,133
Inventories	190,253	264,161
Inventories
Valuation and Qualifying Accounts Disclosure [Line Items]
Allowance for slow-moving and obsolete inventories	$ 6,625
Valuation allowances and reserves		$ 8,446	$ 12,589	$ 13,107

Investments in Available-for-Sale Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Cost Basis	$ 257,500	$ 255,046
Gross Unrealized Gains	4,125	13,678
Gross Unrealized Losses	(7,526)	(4,281)
Fair Value	254,099	264,443
Total Investments	248,954	248,414
US Government Agencies Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost Basis		65,002
Available-for-sale Debt Securities Gross Unrealized Gain		11
Available-for-sale Debt Securities, Gross Unrealized Loss		(75)
Fair Value		64,938
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost Basis	253,590	184,773
Available-for-sale Debt Securities Gross Unrealized Gain		7
Available-for-sale Debt Securities, Gross Unrealized Loss	(4,636)	(1,304)
Fair Value	248,954	183,476
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost Basis	3,910	5,271
Available-for-sale Equity Securities, Gross Unrealized Gain	4,125	13,660
Available-for-sale Equity Securities, Gross Unrealized Loss	(2,890)	(2,902)
Fair Value	5,145	16,029
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
U.S. government and agency securities		64,938
Corporate notes and bonds	248,954	183,476
Total Investments	248,954	248,414
Other Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Equity securities	$ 5,145	$ 16,029

Investments in Available-for-Sale Securities (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2014	Dec. 31, 2013
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 163.0	$ 164.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Greater than Twelve Months, Fair Value	$ 86.1	$ 48.7

Equity Method Investments and Membership Interests in Joint Ventures (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease)		$ 4,054	$ 788	$ 7,690
Impairment of equity investment			28,947
Provision for Loan, Lease, and Other Losses	$ (5,200)
Investments in affiliates				0
Knight Hawk [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		49.00%
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease)		$ (12,603)	(13,536)	(7,151)
DTA [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		22.00%
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease)		$ 3,774	3,644	4,335
Millennium [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		38.00%
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease)		$ 6,742	6,476	8,798
Tongue River [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		35.00%
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease)		$ 2,541	4,004	1,708
Investments in affiliates				0
DKRW [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		24.00%
Other than Temporary Impairment Losses, Investments		$ (57,700)
Impairment of equity investment			13,683
Provision for Loan, Lease, and Other Losses	$ (44,000)
Tenaska [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		35.00%
Other than Temporary Impairment Losses, Investments		$ (20,500)
Impairment of equity investment			$ 15,264
Investments in affiliates				$ 0
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Future development costs, maximum limit		$ 58,500

Equity Method Investments and Membership Interests in Joint Ventures (Schedule of Equity Method Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning Balance	$ 221,456	$ 242,215	$ 225,605
Investments in affiliates			0
Advances to (distributions from) affiliates, net	4,054	788	7,690
Equity in comprehensive income (loss)	(10,332)	(7,400)	(8,920)
Impairment of equity investment		28,947
Ending Balance	235,842	221,456	242,215
Knight Hawk [Member]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning Balance	152,806	149,063	135,225
Advances to (distributions from) affiliates, net	(12,603)	(13,536)	(7,151)
Equity in comprehensive income (loss)	(18,274)	(17,279)	(20,989)
Ending Balance	158,477	152,806	149,063
DTA [Member]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning Balance	14,137	15,462	16,086
Advances to (distributions from) affiliates, net	3,774	3,644	4,335
Equity in comprehensive income (loss)	4,173	4,969	4,959
Ending Balance	13,738	14,137	15,462
Millennium [Member]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning Balance	35,894	32,214	26,324
Advances to (distributions from) affiliates, net	6,742	6,476	8,798
Equity in comprehensive income (loss)	2,413	2,796	2,908
Ending Balance	40,223	35,894	32,214
Tongue River [Member]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning Balance	18,419	14,697	12,989
Investments in affiliates			0
Advances to (distributions from) affiliates, net	2,541	4,004	1,708
Equity in comprehensive income (loss)	220	282
Ending Balance	20,740	18,419	14,697
DKRW [Member]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning Balance		15,515	19,715
Equity in comprehensive income (loss)		1,832	4,200
Impairment of equity investment		13,683
Ending Balance			15,515
Tenaska [Member]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning Balance		15,264	15,266
Investments in affiliates			0
Equity in comprehensive income (loss)			2
Impairment of equity investment		15,264
Ending Balance	0		15,264
Other Affiliates [Member]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning Balance	200
Investments in affiliates			$ 0
Advances to (distributions from) affiliates, net	3,600	200
Equity in comprehensive income (loss)	1,136
Ending Balance	$ 2,664	$ 200

Acquired Sales Contracts (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014
Supply Commitment [Line Items]
Impairment of Intangible Assets, Finite-lived	$ 15,700
Acquired fair value, Assets	131,819	$ 131,299
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months		12,200
Finite-Lived Intangible Assets, Amortization Expense, Year Two		7,200
Finite-Lived Intangible Assets, Amortization Expense, Year Three		3,600
Finite-Lived Intangible Assets, Amortization Expense, Year Four		3,600
Finite-Lived Intangible Assets, Amortization Expense, Year Five		$ 4,100
imparment of intangible asset [Member]
Supply Commitment [Line Items]
Acquired fair value, Assets	$ 17,500

Acquired Sales Contracts (Schedule of Acquired Sales Contracts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets And Liabilities By Major Class [Line Items]
Impairment of Intangible Assets, Finite-lived	$ 15,700
Acquired fair value, Assets	131,819	$ 131,299
Acquired fair value, Liabilities	166,697	166,697
Accumulated amortization, Asset	(129,449)	(130,363)
Accumulated amortization, Liabilities	(120,367)	(134,988)
Total, Assets	2,370	936
Total, Liabilities	46,330	31,709
Net total, Liabilites		(30,773)
Coal Supply Agreement, Liabilities	14,373	12,453
Other Current Assets [Member]
Acquired Finite-Lived Intangible Assets And Liabilities By Major Class [Line Items]
Coal supply agreement, Assets	1,324	462
Accrued Liabilities [Member]
Acquired Finite-Lived Intangible Assets And Liabilities By Major Class [Line Items]
Coal Supply Agreement, Liabilities	14,373	12,453
Other Assets [Member]
Acquired Finite-Lived Intangible Assets And Liabilities By Major Class [Line Items]
Coal supply agreement, Assets	1,046	474
Other Noncurrent Liabilities [Member]
Acquired Finite-Lived Intangible Assets And Liabilities By Major Class [Line Items]
Coal Supply Agreement, Liabilities	$ 31,957	$ 19,256

Derivatives (Narrative) (Details) gal in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2014 USD ($) gal $ / option	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Derivative [Line Items]
Derivative Asset, Collateral, Obligation to Return Cash, Offset	$ (2.4)
Gain (Loss) on Components Excluded from Assessment of Price Risk Hedge Effectiveness			$ 8.2
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net			5.2
Current asset (liability) for the right to reclaim cash collateral		$ 2.2
Net unrealized and realized gains (losses) related to trading portfolio	3.2	$ 4.9	$ 8.3
Gain on derivative contracts designated as hedge instruments in cash flow hedges to be reclassified from OCI into earnings during the next twelve months	4.0
Year One [Member]
Derivative [Line Items]
Value of trading portfolio realized	$ 3.7
Heating Oil [Member]
Derivative [Line Items]
Derivative, Average Price Risk Option Strike Price \| $ / option	3.13
Diesel Purchases [Member] \| Heating Oil [Member]
Derivative [Line Items]
Quantities under derivative contracts \| gal	56
Diesel Purchases [Member] \| Minimum [Member]
Derivative [Line Items]
Gallons of diesel fuel purchased annually \| gal	57
Diesel Purchases [Member] \| Maximum [Member]
Derivative [Line Items]
Gallons of diesel fuel purchased annually \| gal	67

Derivatives (Schedule of Price Risk Derivatives) (Details) number in Thousands	Dec. 31, 2014
Coal Sales [Member]
Derivative [Line Items]
Derivatives Held	4,802
Coal Purchases [Member]
Derivative [Line Items]
Derivatives Held	2,134
Year One [Member] \| Coal Sales [Member]
Derivative [Line Items]
Derivatives Held	4,522
Year One [Member] \| Coal Purchases [Member]
Derivative [Line Items]
Derivatives Held	2,134
Year Two [Member] \| Coal Sales [Member]
Derivative [Line Items]
Derivatives Held	280
Year Two [Member] \| Coal Purchases [Member]
Derivative [Line Items]
Derivatives Held	0

Derivatives (Disclosure of Fair Value of Derivatives) (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Derivative Assets	$ 112,243	$ 67,681
Derivative Liabilities	(99,452)	(47,739)
Effect of counterparty netting in derivative assets	(98,686)	(47,727)
Effect of counterparty netting in derivative liabilities	98,686	47,727
Net derivative assets as classified in the balance sheet	13,557	19,954
Net derivative liabilities as classified in the balance sheet	(766)	(12)
Net derivatives as classified in the balance sheet	12,791	19,942
Designated as Hedging Instrument [Member] \| Coal [Member]
Derivative [Line Items]
Derivative Assets	6,535	909
Derivative Liabilities	(2,492)	(26)
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets	105,708	66,772
Derivative Liabilities	(96,960)	(47,713)
Not Designated as Hedging Instrument [Member] \| Heating Oil-Diesel Purchases [Member]
Derivative [Line Items]
Derivative Assets	300	4,681
Not Designated as Hedging Instrument [Member] \| Heating Oil-Fuel Surchages [Member]
Derivative [Line Items]
Derivative Assets	0	422
Not Designated as Hedging Instrument [Member] \| Coal Held for Trading Purposes [Member]
Derivative [Line Items]
Derivative Assets	96,898	55,327
Derivative Liabilities	(93,272)	(45,763)
Not Designated as Hedging Instrument [Member] \| Coal [Member]
Derivative [Line Items]
Derivative Assets	8,510	6,342
Derivative Liabilities	$ (3,688)	$ (1,950)

Derivatives (Net Derivatives as Reflected on the Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Net derivatives as classified in the balance sheet	$ 12,791	$ 19,942
Other Current Assets [Member] \| Heating Oil [Member]
Derivatives, Fair Value [Line Items]
Net derivatives as classified in the balance sheet	300	5,103
Coal Derivative Assets [Member] \| Coal [Member]
Derivatives, Fair Value [Line Items]
Net derivatives as classified in the balance sheet	13,257	14,851
Coal Derivative Liabilities [Member] \| Coal [Member]
Derivatives, Fair Value [Line Items]
Net derivatives as classified in the balance sheet	$ (766)	$ (12)

Derivatives (Effects of Derivatives on Measures of Financial Performance) (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Derivative Instruments, Gain (Loss) [Line Items]

Gain (Loss) Recognized in OCI (Effective Portion)

$ 5,745

$ 188

$ 5,250

Gains (Losses) Reclassified from OCI into Income (Effective Portion)

(2,643)

(2,981)

(2,675)

Coal Sales [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Gain (Loss) Recognized in OCI (Effective Portion)

10,842

^[1]

(338)

^[1]

7,690

Gains (Losses) Reclassified from OCI into Income (Effective Portion)

(5,336)

^[1]

(3,664)

^[1]

(2,675)

Coal Purchases [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Gain (Loss) Recognized in OCI (Effective Portion)

(5,097)

^[2]

526

^[2]

(2,440)

Gains (Losses) Reclassified from OCI into Income (Effective Portion)

(2,693)

^[2]

(683)

^[2]

Coal [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Unrealized Gain (Loss) on Derivatives

430

^[3]

(12,700)

^[3]

8,272

Coal derivative settlements, non-hedging

5,956

^[4]

32,534

^[4]

43,990

Heating Oil-Diesel Purchases [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Realized Gains (Losses)

(7,848)

^[4]

(9,791)

^[4]

(22,281)

Heating Oil-Fuel Surchages [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Realized Gains (Losses)

$ (405)

^[4]

$ (947)

^[4]

$ (2,209)

[1]	Revenues
[2]	Cost of sales
[3]	Change in fair value of coal derivatives and coal trading activities, net
[4]	Other operating income, net

Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Accrued Expenses and Other Current Liabilities [Abstract]
Payroll and employee benefits	$ 73,362	$ 67,621
Taxes other than income taxes	114,598	114,664
Interest	30,384	18,528
Acquired sales contracts	12,453	14,373
Workers’ compensation	16,714	12,434
Asset retirement obligations	19,222	24,940
Other	35,663	26,027
Accrued Liabilities, Current	$ 302,396	$ 278,587

Debt and Financing Arrangements (Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Other	$ 56,031	$ 32,162
Total	5,160,370	5,151,495
Current maturities of debt	36,885	33,493
Long-term debt	5,123,485	5,118,002
Loans Payable [Member]
Debt Instrument [Line Items]
Term loan due 2018 ($1.9 billion and $1.93 billion face value, respectively)	1,890,846	1,906,975
Term Loan Due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid	1,850,000
7.00% Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Senior notes	1,000,000	1,000,000
8.00% Senior Secured Notes due 2019 [Member]
Debt Instrument [Line Items]
Senior notes	350,000	350,000
9.875% Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Senior notes	363,493	362,358
7.25% Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Senior notes	500,000	500,000
7.25% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Senior notes	$ 1,000,000	$ 1,000,000

Debt and Financing Arrangements (Narrative) (Details) - USD ($) $ in Thousands				1 Months Ended	3 Months Ended	12 Months Ended			52 Months Ended
	Nov. 21, 2012	May 12, 2012	May 01, 2012	May 29, 2012	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Apr. 30, 2018	Dec. 17, 2013	May 30, 2012	May 16, 2012	Jun. 14, 2011
Debt Instrument [Line Items]
Payments to retire debt						$ 300	$ 628,660	$ 452,934
Debt Instrument, Face Amount						5,186,656
Available borrowing capacity under lines of credit						$ 215,100
Line of Credit Facility, Expiration Date						Dec. 08, 2017
Proceeds from Issuance of Secured Debt							294,000	1,633,500
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months						$ 36,915
Long-term Debt, Maturities, Repayments of Principal in Year Two						29,875
Long-term Debt, Maturities, Repayments of Principal in Year Three						30,091
Long-term Debt, Maturities, Repayments of Principal in Year Four						1,858,145
Long-term Debt, Maturities, Repayments of Principal in Year Five						1,730,670
Payments of Financing Costs						4,519	20,489	$ 50,568
Write Off Of Unamortized Discount						6,900
Long-term Debt, Maturities, Repayments of Principal after Year Five						$ 1,500,960
8.00% Senior Secured Notes due 2019 [Member]
Debt Instrument [Line Items]
Senior notes interest rate						8.00%
Senior Notes						$ 350,000	350,000
Debt Instrument, Face Amount										$ 350,000
8.00% Senior Secured Notes due 2019 [Member] \| Redeemable between January 15, 2016 and January 14, 2017 [Member]
Debt Instrument [Line Items]
CallPremium						104.00%
8.00% Senior Secured Notes due 2019 [Member] \| Redeemable between January 15, 2017 and January 14, 2018 [Member]
Debt Instrument [Line Items]
CallPremium						102.00%
8.00% Senior Secured Notes due 2019 [Member] \| Redeemable on or after January 15, 2018 [Member]
Debt Instrument [Line Items]
CallPremium						100.00%
Line of Credit [Member]
Debt Instrument [Line Items]
Write off of Deferred Debt Issuance Cost						$ 1,900	23,400
Line of Credit [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage						0.50%
Line of Credit [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage						0.75%
Term Loan Due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Frequency of Periodic Payment						Quarterly
Debt Instrument, Basis Spread on Variable Rate						5.00%
Proceeds from Issuance of Secured Debt	$ 300,000	$ 1,400,000
Debt Instrument, Discount (Premium), Percentage						1.00%
Payments on term loan					$ 3,500	$ 4,125			$ 4,875
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid						$ 1,850,000
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum						1.25%
Loans Payable [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 1,905,625				$ 300,000
Debt Instrument, Discounted Percentage From Face Amount										98.00%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity						$ 250,000				$ 350,000
9.875% Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Senior notes interest rate						9.875%
Senior Notes						$ 363,493	362,358
Debt Instrument, Face Amount						$ 375,000
Debt Instrument, Discount (Premium), Percentage						95.934%
9.875% Senior Notes Due 2019 [Member] \| Redeemable between December 15, 2016 and December 14, 2017 [Member]
Debt Instrument [Line Items]
CallPremium						104.938%
9.875% Senior Notes Due 2019 [Member] \| Redeemable between December 15, 2017 and December 14, 2018 [Member]
Debt Instrument [Line Items]
CallPremium						102.469%
9.875% Senior Notes Due 2019 [Member] \| On or after December 15, 2018 [Member]
Debt Instrument [Line Items]
CallPremium						100.00%
7.25% Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Senior notes interest rate						7.25%
Senior Notes						$ 500,000	500,000
Debt Instrument, Face Amount						$ 500,000
7.25% Senior Notes Due October 10, 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Frequency of Periodic Payment						Interest is payable on the 2020 Notes on April 1 and October 1 of each year
7.25% Senior Notes Due October 10, 2020 [Member] \| Redeemable between October 1, 2015 and September 30, 2016 [Member]
Debt Instrument [Line Items]
CallPremium						0.00%
7.25% Senior Notes Due October 10, 2020 [Member] \| Redeemable between October 1, 2016 and September 30, 2017 [Member]
Debt Instrument [Line Items]
CallPremium						102.417%
7.25% Senior Notes Due October 10, 2020 [Member] \| Redeemable between October 1, 2017 and September 30, 2018 [Member]
Debt Instrument [Line Items]
CallPremium						101.208%
7.25% Senior Notes Due October 10, 2020 [Member] \| Redeemable on or after October 1, 2018 [Member]
Debt Instrument [Line Items]
CallPremium						100.00%
7.00% Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount													$ 1,000,000
7.00% Senior Notes Due 2019 [Member] \| Redeemable between June 15, 2015 and June 14, 2016 [Member]
Debt Instrument [Line Items]
CallPremium						103.50%
7.00% Senior Notes Due 2019 [Member] \| Redeemable between June 15, 2016 and June 14, 2017 [Member]
Debt Instrument [Line Items]
CallPremium						101.75%
7.00% Senior Notes Due 2019 [Member] \| June 15, 2017 and Beyond [Member]
Debt Instrument [Line Items]
CallPremium						100.00%
7.00% Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Senior notes interest rate						7.00%
Senior Notes						$ 1,000,000	1,000,000
7.25% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Senior notes interest rate						7.25%
Senior Notes						$ 1,000,000	1,000,000
7.25% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount													$ 1,000,000
7.25% Senior Notes Due 2021 [Member] \| Redeemable between June 15, 2016 and June 14, 2017 [Member]
Debt Instrument [Line Items]
CallPremium						103.625%
7.25% Senior Notes Due 2021 [Member] \| Redeemable between June 15, 2017 and June 14, 2018 [Member]
Debt Instrument [Line Items]
CallPremium						102.417%
7.25% Senior Notes Due 2021 [Member] \| Redeemable between June 15, 2018 and June 14, 2019 [Member]
Debt Instrument [Line Items]
CallPremium						101.208%
7.25% Senior Notes Due 2021 [Member] \| June 15, 2019 and Beyond [Member]
Debt Instrument [Line Items]
CallPremium						100.00%
6.75% Senior Notes Due 2013 [Member]
Debt Instrument [Line Items]
Payments to retire debt				$ 308,000
Debt Instrument, Unamortized Premium							(800)
Six Point Seven Five Percentage Senior Notes Due Two Thousand Thirteen [Member]
Debt Instrument [Line Items]
Extinguishment of Debt, Amount			$ 304,000
Debt Instrument, Repurchase Amount											$ 146,000
Senior Notes [Member]
Debt Instrument [Line Items]
Write off of Deferred Debt Issuance Cost						$ 5,400	$ 1,100
Secured Debt [Member] \| 6.75% Senior Notes Due 2013 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount												$ 450,000
Unsecured Debt [Member] \| 8.75% senior unsecured notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount										$ 600,000

Taxes (Schedule of Components of Income Tax) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Taxes [Abstract]
Current Federal Tax Expense (Benefit)	$ 0	$ 0	$ (20,022)
Current State and Local Tax Expense (Benefit)	25	(647)	575
Current Income Tax Expense (Benefit)	25	(647)	(19,447)
Deferred Federal Income Tax Expense (Benefit)	18,535	(318,956)	(341,486)
Deferred State and Local Income Tax Expense (Benefit)	7,074	(15,895)	7,026
Deferred Income Tax Expense (Benefit)	25,609	(334,851)	(334,460)
Provision for (benefit from) income taxes	$ 25,634	$ (335,498)	$ (353,907)

Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Taxes [Abstract]
Income tax expense statutory rate	$ (186,452)	$ (378,463)	$ (382,581)
Percentage depletion allowance	(12,692)	(15,796)	(33,654)
Goodwill		70,301	56,916
State taxes, net of effect of federal taxes	(3,903)	(25,265)	(24,231)
Change in valuation allowance	226,929	8,659	31,832
Other, net	1,752	5,066	(2,189)
Provision for (benefit from) income taxes	$ 25,634	$ (335,498)	$ (353,907)

Taxes (Schedule of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Taxes [Abstract]
Net operating loss carryforwards	$ 871,848	$ 660,916
Alternative minimum tax credit carryforwards	127,169	126,755
Reclamation and mine closure	114,430	113,843
Goodwill	50,072	52,636
Workers' compensation	38,924	31,641
Share based compensation	30,283	28,494
Acquired sales contracts	26,833	33,392
Retiree benefit plans	22,913	20,527
Contract obligations	15,693	19,327
Other, primarily accrued liabilities	64,503	68,969
Gross deferred tax assets	1,362,668	1,156,500
Valuation allowance	(270,251)	(43,322)
Total deferred tax assets	1,092,417	1,113,178
Plant and equipment	1,354,396	1,364,382
Deferred development	95,129	91,126
Investment in tax partnerships	7,377	8,170
Other	5,533	13,902
Deferred Tax Liabilities, Gross	1,462,435	1,477,580
Total deferred tax liabilities	$ 370,018	$ 364,402

Taxes (Schedule of Gross Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 34,709	$ 31,789	$ 31,150	$ 8,798
Additions based on tax positions related to the current year		2,920	1,199	409
Additions for tax positions of prior years			688	21,943
Reductions as a result of lapses in the statute of limitations	$ 0		(1,248)
Ending Balance		$ 34,709	$ 31,789	$ 31,150

Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
Taxes (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Taxes [Abstract]
Stock options and other equity based compensation, tax expense (benefit)					$ 1,600	$ 1,500	$ 300
Operating loss carryforwards	$ 2,400,000				2,400,000
Alternative minimum tax credit carryforwards	127,169				127,169	126,755
Increase (decrease) in valuation allowance	169,000	$ 15,800	$ 18,300	$ 23,800	226,900	8,700	$ 31,800
Interest and penalties accrued related to unrecognized tax benefits	$ 1,500				$ 1,500	$ 1,300

Asset Retirement Obligations (Narrative) (Details) $ in Millions	Dec. 31, 2013 USD ($)
asset retirement obligations [Line Items]
Letters of Credit Outstanding, Amount	$ 3.5
Asset retirement obligations [Member]
asset retirement obligations [Line Items]
Self-bonding obligations	458.5
Asset retirement obligations [Member]
asset retirement obligations [Line Items]
Surety bonds outstanding	$ 177.7

Asset Retirement Obligations (Schedule of Asset Retirement Obligations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	$ 427,653	$ 448,625
Accretion expense	32,909	35,727
Obligations incurred or acquired	(30,684)	(8,440)
Adjustments to the liability from changes in estimates	627	(26,578)
Liabilities settled	(12,387)	(21,681)
Ending Balance	418,118	427,653
Current portion included in accrued expenses	(19,222)	(24,940)
Noncurrent liability	$ 398,896	$ 402,713

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of senior notes and other long-term debt, including amounts classified as current	$ 2,700.0	$ 4,600.0
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized losses related to level 3 financial instruments	$ (2.1)

Fair Value Measurements (Summary of Financial Assets and Liabilities Accounted for at Fair Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Assets:
Investments in marketable securities	$ 254,099	$ 264,443
Derivatives	13,557	19,954
Total assets	267,656	284,397
Liabilities:
Coal derivative liabilities	766	12
Level 1 [Member]
Assets:
Investments in marketable securities	5,145	77,967
Derivatives	9,026	14,847
Total assets	14,171	92,814
Level 2 [Member]
Assets:
Investments in marketable securities	248,954	186,476
Derivatives	1,491
Total assets	250,445	186,476
Liabilities:
Coal derivative liabilities	766	(149)
Level 3 [Member]
Assets:
Derivatives	3,040	5,107
Total assets	3,040	5,107
Liabilities:
Coal derivative liabilities	$ 0	$ 161

Fair Value Measurements (Summary of Change in the Fair Values of Financial Instruments Categorized as Level 3) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 4,946	$ 8,174
Realized and unrealized losses recognized in earnings, net	(6,572)	(10,253)
Purchases	5,288	8,654
Issuances	(622)	(25)
Settlements	0	(1,604)
Ending balance	$ 3,040	$ 4,946

Capital Stock (Narrative) (Details)	Dec. 31, 2014 shares
Capital Stock [Abstract]
Stock repurchase authorized number	14,000,000
Outstanding shares available for repurchase	10,925,800

Stock-Based Compensation and Other Incentive Plans (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 5.6	$ 5.0	$ 3.5
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value	$ 3.10
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	10.3
Stock options compensation expense	$ 3.2	6.7	8.0
Unrecognized compensation cost	1.6
Options vested in period fair value	8.7	8.9	8.0
Amounts unpaid under long term incentive plan	21.1	17.2
Net cash surrender values	$ 37.6	39.4
Participants maximum deferred amount in base salaries percentage	85.00%
Participants maximum deferred amount in annual incentive awards percentage	100.00%
Participants maximum deferred stock awards percentage	100.00%
Deferred compensation plan liability	$ 35.1	37.0
Net income (expense) related to deferred compensation plan	$ (1.6)	$ 2.6	3.3
Weighted average grant-date fair value per share of options granted	$ 2.37	$ 5.27
Option, weighted average risk free rate	0.65%	0.75706%
Option, weighted average dividend yield	2.30%	2.91789%
Option, weighted average volatility	66.70%	60.71644%
Expected life of options (Years)	4 years 6 months	4 years 6 months
Shares authorized for incentive plan	30.9
long term incentive plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period	3 years
Compensation expense	$ 10.1	$ 9.1	$ 8.1

Stock-Based Compensation and Other Incentive Plans (Schedule of Stock Option Activity Under Incentive Plan) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2014 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at January 1	6,939
Cancelled, Common Shares	(88)
Expired, Common Shares	(29)
Options outstanding at December 31	6,822
Options exercisable at December 31	5,123
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price \| $ / shares	$ 19.86
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price \| $ / shares	17.61
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price \| $ / shares	29.84
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price \| $ / shares	19.84
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price \| $ / shares	$ 24.01
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value \| $	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value \| $	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares	1,699

Stock-Based Compensation and Other Incentive Plans (Schedule of Weighted Average Assumptions Used in Option Pricing) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation [Abstract]
Weighted average grant-date fair value per share of options granted	$ 2.37	$ 5.27
Option, weighted average risk free rate	0.65%	0.75706%
Option, weighted average dividend yield	2.30%	2.91789%
Option, weighted average volatility	66.70%	60.71644%
Expected life of options (Years)	4 years 6 months	4 years 6 months

Stock-Based Compensation and Other Incentive Plans (Restricted Stock and Restricted Stock Unit Activity and Weighted Average Grant-Date Fair Value) (Details) shares in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2014 $ / shares shares	Dec. 31, 2014 $ / shares shares
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Oustanding as of January 1		143
Shares granted during period		0
Vested		(120)
Canceled		(1)
Outstanding as of December 31	22	22
Outstanding Weighted Average Grant Date Price \| $ / shares	$ 13.44	$ 13.44
Weighted average fair value of restricted stock granted \| $ / shares		0.00
Vested, Weighted Average Grant-Date Fair Value \| $ / shares		$ 30.08
Canceled, Weighted Average Grant-Date Fair Value \| $ / shares		32.49
Outstanding Weighted Average Grant Date Price \| $ / shares		$ 27.52
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Oustanding as of January 1		1,373
Shares granted during period		1,521
Vested		0
Canceled		(70)
Outstanding as of December 31	2,824	2,824
Outstanding Weighted Average Grant Date Price \| $ / shares	$ 6.14	$ 6.14
Weighted average fair value of restricted stock granted \| $ / shares		4.51
Vested, Weighted Average Grant-Date Fair Value \| $ / shares		$ 0.00
Canceled, Weighted Average Grant-Date Fair Value		6.34
Outstanding Weighted Average Grant Date Price \| $ / shares		$ 7.95
Restricted Stock Units (RSUs) [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years

Workers' Compensation Expense (Worker's Compensation Expense) (Details) - Workers' Compensation [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accrued Workers' Compensation [Line Items]
Total net benefit	$ 4,432	$ 6,137	$ 6,962
Traumatic injury claims and assessments	19,924	21,089	26,565
Total workers’ compensation expense	$ 24,356	$ 27,226	$ 33,527

Workers' Compensation Expense (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2014 USD ($)
Workers' Compensation Benefits [Domain]
Workers' Compensation [Line Items]
Surety Bonds And Letters Of Credit Outstanding	$ 121.4

Workers' Compensation Expense (Schedule of Amounts Recognized in Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Accrued Workers' Compensation [Line Items]
Total obligations	$ 111,005	$ 90,496
Less amount included in accrued expenses	16,714	12,434
Noncurrent obligations	94,291	78,062
Occupational Disease [Member]
Accrued Workers' Compensation [Line Items]
Occupational disease costs	72,749	55,228
Workers' Compensation [Member]
Accrued Workers' Compensation [Line Items]
Occupational disease costs	$ 38,256	$ 35,268

Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation of pension plans	$ 353,700	$ 341,100
Health care cost trend rate assumed	7.10%
Ultimate trend rate	4.50%
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Amount invested by plan	$ 16,000
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	65.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	35.00%
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amortization of Net Gains (Losses)	$ (8,200)
Pension Contributions	500
Other postretirement benefits payments	22,900	25,100	$ 27,200
Defined Benefit Plan, Plan Amendments	(23)	0
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of net prior service cost	8,000
Defined Benefit Plan, Amortization of Net Gains (Losses)	1,800
Defined Benefit Plan, Plan Amendments	$ 0	$ 0

Employee Benefit Plans (Schedule of Defined Benefit Plans Disclosures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Value of Plan Assets at January 1	$ 347,952
Value of Plan Assets at December 31		$ 347,952
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligations at January 1	355,468	390,894
Service cost	21,478	27,065	$ 27,466
Interest cost	17,070	16,207	15,668
Plan Amendments	(23)	0
Benefits Paid	(53,974)	(41,562)
Curtailments	(25,787)	(3,027)
Other-primary actuarial loss (gain)	39,504	(34,109)
Benefit Obligations at December 31	353,736	355,468	390,894
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Value of Plan Assets at January 1	347,952	322,874
Actual Return on Plan Assets	36,130	52,247
Employer contributions	6,601	14,393
Benefits Paid	(53,974)	(41,562)
Value of Plan Assets at December 31	336,709	347,952	322,874
Accrued benefit cost	(17,027)	(7,516)
Prior service cost (credit)	0	1,732
Accumulated gain (loss)	(11,332)	10,096
Total not yet recognized as a component of net periodic benefit cost	(11,332)	11,828
Current liability	(767)	(405)
Noncurrent liability	(16,260)	(7,111)
Pension and Other Postretirement Defined Benefit Plans, Liabilities	(17,027)	(7,516)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligations at January 1	42,531	49,326
Service cost	1,649	2,027	2,142
Interest cost	1,841	1,739	2,020
Plan Amendments	0	0
Benefits Paid	(3,431)	(3,276)
Curtailments	0	(2,519)
Other-primary actuarial loss (gain)	(6,492)	(4,766)
Benefit Obligations at December 31	36,098	42,531	49,326
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Value of Plan Assets at January 1	0	0
Actual Return on Plan Assets	0	0
Employer contributions	3,431	3,276
Benefits Paid	(3,431)	(3,276)
Value of Plan Assets at December 31	0	0	$ 0
Accrued benefit cost	(36,098)	(42,531)
Prior service cost (credit)	21,972	31,925
Accumulated gain (loss)	9,125	3,394
Total not yet recognized as a component of net periodic benefit cost	31,097	35,319
Current liability	(3,430)	(3,276)
Noncurrent liability	(32,668)	(39,255)
Pension and Other Postretirement Defined Benefit Plans, Liabilities	$ (36,098)	$ (42,531)

Employee Benefit Plans (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 21,478	$ 27,065	$ 27,466
Interest cost	17,070	16,207	15,668
Curtailments	(25,368)	47	324
Settlements	646	0	0
Expected return on plan assets	(23,756)	(23,761)	(22,030)
Amortization of prior service cost (credit)	(257)	(204)	259
Amortization of other actuarial (gains) losses	3,128	14,616	14,666
Total net benefit	(7,059)	33,970	36,353
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,649	2,027	2,142
Interest cost	1,841	1,739	2,020
Curtailments		(5,444)	(4,049)
Expected return on plan assets	0	0	0
Amortization of prior service cost (credit)	(10,003)	(10,621)	(11,458)
Amortization of other actuarial (gains) losses	(761)	(252)	(522)
Total net benefit	$ (7,274)	$ (12,551)	$ (11,867)

Employee Benefit Plans (Schedule of Assumptions Used to Calculate Benefit Obligations) (Details)	Dec. 31, 2014	Dec. 31, 2013
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	4.15%	5.08%
Rate of compensation increase		3.39%
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	3.91%	4.58%

Employee Benefit Plans (Schedule of Assumptions Used) (Details)		2 Months Ended	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Aug. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount Rate	4.14%		5.05%	4.13%	5.08%		4.91%
Rate of Compensation Increase					3.39%	3.39%	3.39%
Expected return on plan assets					7.75%	7.75%	7.75%
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount Rate		4.23%
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount Rate			4.58%	3.64%	4.58%		4.52%

Employee Benefit Plans (Summary of Estimated Future Benefit Payments) (Details) $ in Thousands	Dec. 31, 2014 USD ($)
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	$ 17,737
Defined Benefit Plan, Expected Future Benefit Payments, Rolling Year Two	20,544
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	22,503
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	24,086
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	22,943
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	130,088
DefinedBenefitPlanExpectedFutureBenefitPaymentsTotal	237,901
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	3,665
Defined Benefit Plan, Expected Future Benefit Payments, Rolling Year Two	3,657
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	3,551
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	3,486
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	3,421
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	14,680
DefinedBenefitPlanExpectedFutureBenefitPaymentsTotal	$ 32,460

Earnings (Loss) Per Common Share (Narrative) (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Earnings Per Share, Potentially Dilutive Securities			1953474
Effect of options to purchase common stock	7.7	7.5	4.9

Leases (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Leases (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
lease payments [Line Items]
Capital Lease Obligations	$ 46.0	$ 20.8
Rental expense	42.9	42.2	$ 41.2
Royalty expense	242.5	$ 261.1	$ 302.0
lease [Member]
lease payments [Line Items]
Surety bonds outstanding	$ 49.4

Leases (Schedule of Lease Minimum Payments) (Details) $ in Thousands	Dec. 31, 2014 USD ($)
Property Subject to Operating Lease [Member]
lease payments [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 25,685
Operating Leases, Future Minimum Payments, Due in Two Years	19,242
Operating Leases, Future Minimum Payments, Due in Three Years	17,065
Operating Leases, Future Minimum Payments, Due in Four Years	6,334
Operating Leases, Future Minimum Payments, Due in Five Years	3,370
Operating Leases, Future Minimum Payments, Due Thereafter	11,880
Operating Leases, Future Minimum Payments Due	83,576
Royalty Agreements [Member]
lease payments [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	14,587
Operating Leases, Future Minimum Payments, Due in Two Years	18,632
Operating Leases, Future Minimum Payments, Due in Three Years	17,932
Operating Leases, Future Minimum Payments, Due in Four Years	17,584
Operating Leases, Future Minimum Payments, Due in Five Years	13,875
Operating Leases, Future Minimum Payments, Due Thereafter	83,282
Operating Leases, Future Minimum Payments Due	$ 165,892

Risk Concentrations (Narrative) (Details) $ in Thousands, T in Millions	12 Months Ended
	Dec. 31, 2014 USD ($) T	Dec. 31, 2013 USD ($)
Concentration Risk [Line Items]
Receivables	$ 232,017	$ 229,573
Trade accounts receivable	$ 211,506	198,020
Tons of coal sold \| T	134.4
Percentage of tons sold under long term contract	60.00%
Long term contracts percentage of company revenue	48.00%
Long-term contracts, life term, minimum	1 year
Long-term contracts, life term, maximum	6 years
Electric Utilities [Member]
Concentration Risk [Line Items]
Receivables	$ 134,700	125,700
Percentage of total trade accounts receivable	64.00%
Domestic And Foreign Steel Producers [Member]
Concentration Risk [Line Items]
Trade accounts receivable	$ 76,000	$ 70,500
Trade receivables, percentage	36.00%

Risk Concentrations (Schedule of Foreign Revenues) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Europe [Member]
foreign revenue [Line Items]
Sales to customers in foreign countries	$ 277,565	$ 371,363	$ 674,754
Asia [Member]
foreign revenue [Line Items]
Sales to customers in foreign countries	156,057	160,404	203,193
North America [Member]
foreign revenue [Line Items]
Sales to customers in foreign countries	78,445	80,322	72,542
South America [Member]
foreign revenue [Line Items]
Sales to customers in foreign countries	20,496	55,493	57,184
Brokered Sales [Member]
foreign revenue [Line Items]
Sales to customers in foreign countries	79,354	154,442	145,438
Total [Member]
foreign revenue [Line Items]
Sales to customers in foreign countries	$ 611,917	$ 822,024	$ 1,153,111

Settlement with Patriot Coal (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loss Contingencies [Line Items]
Gain (Loss) Related to Litigation Settlement	$ 0	$ (12,000)	$ 0
Patriot Coal [Member]
Loss Contingencies [Line Items]
Payments for Legal Settlements	$ 5,000

Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended	12 Months Ended
	Jul. 31, 2013	Feb. 01, 2011	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 25, 2011	Aug. 13, 2007
Loss Contingencies [Line Items]
Unrecorded Unconditional Purchase Obligation, Purchases				$ (36.5)	$ (12.0)	$ (2.3)
Purchase replacement coal								$ 100.0
Damages and interest awarded							$ 104.1
Amount accrued				22.3	30.4
Amount accrued current portion				10.1	$ 11.7
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months				265.6
Unrecorded Unconditional Purchase Obligation, Due within Two Years				118.1
Unrecorded Unconditional Purchase Obligation, Due within Three Years				114.7
Unrecorded Unconditional Purchase Obligation, Due within Four Years				82.2
Unrecorded Unconditional Purchase Obligation, Due within Five Years				73.5
Unrecorded Unconditional Purchase Obligation, Due after Five Years				$ 279.4
Minimum [Member]
Loss Contingencies [Line Items]
Aggregate amount of past and future damages		$ 228.0
Maximum [Member]
Loss Contingencies [Line Items]
Aggregate amount of past and future damages		$ 377.0
past damages [Member]
Loss Contingencies [Line Items]
Damages and interest awarded							13.8
future damages [Member]
Loss Contingencies [Line Items]
Damages and interest awarded							$ 90.3
Pending Litigation [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Amount			$ 7.5
Judicial Ruling [Member]
Loss Contingencies [Line Items]
Payments for Legal Settlements	$ 15.6

Segment Information (Schedule of Operating Segment Results) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 745,192	$ 742,180	$ 713,776	$ 735,971	$ 719,386	$ 791,269	$ 766,332	$ 737,370	$ 2,937,119	$ 3,014,357	$ 3,768,126
Adjusted EBITDA									280,143	252,146	579,872
Depreciation, depletion and amortization									418,748	426,442	492,211
Amortization of acquired sales contracts, net									(13,187)	(9,457)	(25,189)
Total assets	8,429,723				8,990,193				8,429,723	8,990,193	10,006,777
Capital expenditures									147,286	296,984	395,225
PRB [Member]
Segment Reporting Information [Line Items]
Revenues									1,490,377	1,482,812	1,524,536
Adjusted EBITDA									198,074	206,910	262,155
Depreciation, depletion and amortization									168,522	171,324	166,539
Amortization of acquired sales contracts, net									(3,961)	(3,656)	(1,987)
Total assets	1,772,230				1,841,835				1,772,230	1,841,835	1,972,522
Capital expenditures									44,305	9,784	23,410
APP [Member]
Segment Reporting Information [Line Items]
Revenues									1,108,358	1,145,801	1,793,576
Adjusted EBITDA									110,693	88,883	405,981
Depreciation, depletion and amortization									205,732	202,952	271,221
Amortization of acquired sales contracts, net									(9,433)	(10,364)	(23,926)
Total assets	3,379,834				3,971,764				3,379,834	3,971,764	3,875,105
Capital expenditures									23,638	167,759	275,476
Other Segments [Member]
Segment Reporting Information [Line Items]
Revenues									338,384	385,744	450,014
Adjusted EBITDA									56,612	94,948	112,982
Depreciation, depletion and amortization									40,125	45,741	49,911
Amortization of acquired sales contracts, net									207	4,563	724
Total assets	339,809				402,922				339,809	402,922	834,287
Capital expenditures									12,993	23,122	68,220
Corporate, Other and Eliminations [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDA									(85,236)	(138,595)	(201,246)
Depreciation, depletion and amortization									4,369	6,425	4,540
Amortization of acquired sales contracts, net									0	0
Total assets	$ 2,937,850				$ 2,773,672				2,937,850	2,773,672	3,324,863
Capital expenditures									$ 66,350	$ 96,319	$ 28,119

Segment Information (Reconciliation of Segment Income from Operations to Consolidated Income Before Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting [Abstract]
Adjusted EBITDA									$ 280,143	$ 252,146	$ 579,872
Depreciation, depletion and amortization									(418,748)	(426,442)	(492,211)
Other Depreciation and Amortization									13,187	9,457	25,189
Asset impairment and mine closure costs	$ (17,541)	$ (5,060)	$ (1,512)	$ 0	$ 0	$ (200,397)	$ (20,482)	$ 0	(24,113)	(220,879)	(539,182)
Goodwill impairment						$ 0	$ 0	$ 0	0	(265,423)	(330,680)
Gain (Loss) Related to Litigation Settlement									0	(12,000)	0
Interest expense, net									(383,188)	(374,664)	(312,142)
Net loss resulting from early retirement and refinancing of debt									0	(42,921)	(23,668)
Nonoperating expense										(42,921)	(23,668)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									$ (532,719)	$ (1,080,726)	$ (1,092,822)

Quarterly Selected Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information [Abstract]
Coal Products and Services Revenue	$ 745,192	$ 742,180	$ 713,776	$ 735,971	$ 719,386	$ 791,269	$ 766,332	$ 737,370	$ 2,937,119	$ 3,014,357	$ 3,768,126
Gross Profit	32,264	(5,851)	(6,350)	(49,842)	(44,801)	90	2,505	(18,560)
Asset impairment and mine closure costs	17,541	5,060	1,512	0	0	200,397	20,482	0	24,113	220,879	539,182
Goodwill impairment						0	0	0	0	265,423	330,680
Asset Impairment Charges					265,423
Income (loss) from operations	(5,303)	(35,300)	(35,805)	(73,123)	(340,678)	(234,753)	(36,279)	(51,431)	(149,531)	(663,141)	(757,012)
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest					(372,794)	(207,767)	(80,351)	(84,316)	(558,353)	(745,228)	(738,915)
Income from discontinued operations, including gain on sale - net of tax					1,580	79,404	8,145	14,267	0	103,396	55,228
Net loss	$ (240,135)	$ (97,218)	$ (96,860)	$ (124,140)	$ (371,214)	$ (128,363)	$ (72,206)	$ (70,049)	(558,353)	(641,832)	(683,687)
Income (Loss) from Continuing Operations, Per Diluted Share					$ (1.76)	$ (0.98)	$ (0.38)	$ (0.40)
Earnings Per Share, Diluted	$ (1.13)	$ (0.46)	$ (0.46)	$ (0.59)	$ (1.7498868650)	$ (0.61)	$ (0.34)	$ (0.33)
Increase (decrease) in valuation allowance	$ 169,000	$ 15,800	$ 18,300	$ 23,800					$ 226,900	$ 8,700	$ 31,800

Supplemental Consolidating Financial Information (Schedule of Consolidating Statements of Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Income Statements, Captions [Line Items]
Dividends declared per common share									$ 0.01	$ 0.12	$ 0.20
Revenues	$ 745,192	$ 742,180	$ 713,776	$ 735,971	$ 719,386	$ 791,269	$ 766,332	$ 737,370	$ 2,937,119	$ 3,014,357	$ 3,768,126
Costs, expenses and other
Cost of sales (exclusive of items shown separately below)									2,566,193	2,663,136	3,155,099
Depreciation, depletion and amortization									418,748	426,442	492,211
Amortization of acquired sales contracts, net									(13,187)	(9,457)	(25,189)
Change in fair value of coal derivatives and coal trading activities, net									(3,686)	7,845	(16,590)
Asset impairment and mine closure costs	17,541	5,060	1,512	0	0	200,397	20,482	0	24,113	220,879	539,182
Goodwill impairment						0	0	0	0	265,423	330,680
Contract settlement resulting from Patriot Coal bankruptcy									0	0	58,335
Reduction in accrual related to acquired litigation										0	(79,532)
Selling, general and administrative expenses									114,223	133,448	134,299
Other operating income, net									(19,754)	(30,218)	(63,357)
Total operating expenses									3,086,650	3,677,498	4,525,138
Loss from investment in subsidiaries									0
Loss from operations	(5,303)	(35,300)	(35,805)	(73,123)	(340,678)	(234,753)	(36,279)	(51,431)	(149,531)	(663,141)	(757,012)
Interest expense, net
Interest expense									(390,946)	(381,267)	(317,615)
Interest and investment income									7,758	6,603	5,473
Interest expense, net									(383,188)	(374,664)	(312,142)
Other Nonoperating Income (Expense) [Abstract]
Net loss resulting from early retirement of debt and financing activities										(42,921)	(23,668)
Net loss resulting from early retirement and refinancing of debt									0	(42,921)	(23,668)
Loss from continuing operations before income taxes									(532,719)	(1,080,726)	(1,092,822)
Provision for (benefit from) income taxes									25,634	(335,498)	(353,907)
Loss from continuing operations					(372,794)	(207,767)	(80,351)	(84,316)	(558,353)	(745,228)	(738,915)
Income from discontinued operations, including gain on sale - net of tax					1,580	79,404	8,145	14,267	0	103,396	55,228
Net income (loss)	$ (240,135)	$ (97,218)	$ (96,860)	$ (124,140)	$ (371,214)	$ (128,363)	$ (72,206)	$ (70,049)	(558,353)	(641,832)	(683,687)
Less: Net income attributable to noncontrolling interest										0	(268)
Net loss attributable to Arch Coal, Inc.									(558,353)	(641,832)	(683,955)
Total comprehensive income (loss)									(592,804)	(587,633)	(692,239)
Parent/Issuer [Member]
Condensed Income Statements, Captions [Line Items]
Revenues									0
Costs, expenses and other
Cost of sales (exclusive of items shown separately below)									3,016	9,117	10,921
Depreciation, depletion and amortization									5,154	5,949	5,392
Amortization of acquired sales contracts, net									0
Change in fair value of coal derivatives and coal trading activities, net									0
Asset impairment and mine closure costs									3,642	78,150
Goodwill impairment										0
Reduction in accrual related to acquired litigation											0
Selling, general and administrative expenses									79,902	88,820	84,199
Other operating income, net									(4,480)	4,209	(13,392)
Total operating expenses									87,234	186,245	87,120
Loss from investment in subsidiaries									(13,085)	(328,889)	(589,665)
Loss from operations									(100,319)	(515,134)	(676,785)
Interest expense, net
Interest expense									463,823	(449,614)	(366,584)
Interest and investment income									31,389	30,285	27,750
Interest expense, net									(432,434)	(419,329)	(338,834)
Other Nonoperating Income (Expense) [Abstract]
Net loss resulting from early retirement and refinancing of debt										(42,921)	(21,975)
Loss from continuing operations before income taxes									(532,753)	(977,384)	(1,037,594)
Provision for (benefit from) income taxes									25,600	(335,552)	(353,907)
Loss from continuing operations										(641,832)	(683,687)
Income from discontinued operations, including gain on sale - net of tax										0
Net income (loss)											(683,687)
Less: Net income attributable to noncontrolling interest											(268)
Net loss attributable to Arch Coal, Inc.									(558,353)	(641,832)	(683,955)
Total comprehensive income (loss)									(592,804)	(587,633)	(692,239)
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenues									2,937,119	3,014,357	3,768,126
Costs, expenses and other
Cost of sales (exclusive of items shown separately below)									2,566,572	2,657,583	3,144,178
Depreciation, depletion and amortization									413,559	420,458	486,786
Amortization of acquired sales contracts, net									(13,187)	(9,457)	(25,189)
Change in fair value of coal derivatives and coal trading activities, net									(3,686)	7,845	(16,590)
Asset impairment and mine closure costs									20,471	142,729	539,182
Goodwill impairment										265,423	330,680
Contract settlement resulting from Patriot Coal bankruptcy											58,335
Reduction in accrual related to acquired litigation											(79,532)
Selling, general and administrative expenses									29,739	39,825	44,363
Other operating income, net									(15,726)	(34,856)	(39,209)
Total operating expenses									2,997,742	3,489,550	4,443,004
Loss from investment in subsidiaries									0
Loss from operations									(60,623)	(475,193)	(674,878)
Interest expense, net
Interest expense									26,137	(24,747)	(34,849)
Interest and investment income									74,511	68,248	57,268
Interest expense, net									48,374	43,501	22,419
Other Nonoperating Income (Expense) [Abstract]
Net loss resulting from early retirement and refinancing of debt										0	(1,693)
Loss from continuing operations before income taxes									(12,249)	(431,692)	(654,152)
Provision for (benefit from) income taxes									0
Loss from continuing operations										(431,692)	(654,152)
Income from discontinued operations, including gain on sale - net of tax										103,396	55,228
Net income (loss)											(598,924)
Net loss attributable to Arch Coal, Inc.									(12,249)	(328,296)	(598,924)
Total comprehensive income (loss)									(34,439)	(304,278)	(604,903)
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenues									0
Costs, expenses and other
Cost of sales (exclusive of items shown separately below)									0
Depreciation, depletion and amortization									35	35	33
Amortization of acquired sales contracts, net									0
Change in fair value of coal derivatives and coal trading activities, net									0
Asset impairment and mine closure costs									0
Goodwill impairment										0
Reduction in accrual related to acquired litigation											0
Selling, general and administrative expenses									6,626	7,038	8,785
Other operating income, net									(4,987)	(5,370)	(13,804)
Total operating expenses									1,674	1,703	(4,986)
Loss from investment in subsidiaries									0
Loss from operations									(1,674)	(1,703)	4,986
Interest expense, net
Interest expense									4,259	(4,214)	(3,221)
Interest and investment income									5,131	5,378	7,494
Interest expense, net									872	1,164	4,273
Other Nonoperating Income (Expense) [Abstract]
Net loss resulting from early retirement and refinancing of debt										0
Loss from continuing operations before income taxes									(802)	(539)	9,259
Provision for (benefit from) income taxes									34	54
Loss from continuing operations										(593)	9,259
Income from discontinued operations, including gain on sale - net of tax										0
Net income (loss)											9,259
Net loss attributable to Arch Coal, Inc.									(836)	(593)	9,259
Total comprehensive income (loss)									(836)	(593)	9,259
Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Revenues									0
Costs, expenses and other
Cost of sales (exclusive of items shown separately below)									(3,395)	(3,564)
Depreciation, depletion and amortization									0
Amortization of acquired sales contracts, net									0
Change in fair value of coal derivatives and coal trading activities, net									0
Asset impairment and mine closure costs									0
Goodwill impairment										0
Reduction in accrual related to acquired litigation											0
Selling, general and administrative expenses									(2,044)	(2,235)	(3,048)
Other operating income, net									5,439	5,799	3,048
Total operating expenses									0
Loss from investment in subsidiaries									13,085	328,889	589,665
Loss from operations									13,085	328,889	589,665
Interest expense, net
Interest expense									(103,273)	97,308	87,039
Interest and investment income									(103,273)	(97,308)	(87,039)
Interest expense, net									0	0	0
Other Nonoperating Income (Expense) [Abstract]
Net loss resulting from early retirement and refinancing of debt										0
Loss from continuing operations before income taxes									13,085	328,889	589,665
Provision for (benefit from) income taxes									0
Loss from continuing operations										328,889	589,665
Income from discontinued operations, including gain on sale - net of tax										0
Net income (loss)											589,665
Net loss attributable to Arch Coal, Inc.									13,085	328,889	589,665
Total comprehensive income (loss)									$ 35,275	$ 304,871	$ 595,644

Supplemental Consolidating Financial Information (Schedule of Consolidating Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 01, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 734,231	$ 911,099	$ 784,622		$ 138,149
Short term investments	248,954	248,414
Receivables, Net, Current	232,017	229,573
Inventory, Net	190,253	264,161
Prepaid Expense and Other Assets, Current	137,296	128,824
Assets, Current	1,542,751	1,782,071
Property, Plant and Equipment, Net	6,453,458	6,734,286
Prepaid Expense and Other Assets, Noncurrent		473,836
Assets, Noncurrent	433,514	473,836
Total assets	8,429,723	8,990,193	10,006,777
Liabilities and Stockholders’ Equity
Accounts payable	180,113	176,142
Accrued Expenses Derivatives And Other Liabilities Current		278,587
Accrued expenses and other current liabilities	302,396	278,587
Debt, Current	36,885	33,493
Liabilities, Current	519,394	488,222
Long-term Debt, Excluding Current Maturities	5,123,485	5,118,002
Mine Reclamation and Closing Liability, Noncurrent	398,896	402,713
Defined Benefit Pension Plan, Liabilities, Noncurrent	16,260	7,111
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent	32,668	39,255
Accrued workers’ compensation	94,291	78,062
Deferred income taxes	422,809	413,546
Other noncurrent liabilities	153,766	190,033
Liabilities	6,761,569	6,736,944
Stockholders' Equity Attributable to Parent	1,668,154	2,253,249	2,854,567	$ 3,578,040
Liabilities and Equity	8,429,723	8,990,193
Parent/Issuer [Member]
Assets
Cash and cash equivalents	572,185	799,333	671,313		61,375
Short term investments	248,954	248,414
Receivables, Net, Current	9,656	14,177
Inventory, Net	0
Prepaid Expense and Other Assets, Current	89,211	84,401
Assets, Current	920,006	1,146,325
Property, Plant and Equipment, Net	10,470	24,851
Investment in subsidiaries	7,464,221	7,741,589
Due from Affiliate, Noncurrent	0
Notes Receivable, Related Parties	675,000	675,000
Prepaid Expense and Other Assets, Noncurrent	131,884	162,287
Assets, Noncurrent		8,578,876
Total assets	9,201,581	9,750,052
Liabilities and Stockholders’ Equity
Accounts payable	23,394	17,781
Accrued Expenses Derivatives And Other Liabilities Current		53,779
Accrued expenses and other current liabilities	85,899
Debt, Current	27,625	28,882
Liabilities, Current	136,918	100,442
Long-term Debt, Excluding Current Maturities	5,084,839	5,099,833
Intercompany payables	1,817,755	1,772,624
Notes Payable, Related Parties	0
Mine Reclamation and Closing Liability, Noncurrent	981	1,095
Defined Benefit Pension Plan, Liabilities, Noncurrent	5,967	7,797
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent	4,430	12,079
Accrued workers’ compensation	9,172	21,546
Deferred income taxes	422,809	413,546
Other noncurrent liabilities	50,919	67,841
Liabilities	7,533,790	7,496,803
Stockholders' Equity Attributable to Parent	1,667,791	2,253,249
Liabilities and Equity	9,201,581	9,750,052
Guarantor Subsidiaries [Member]
Assets
Cash and cash equivalents	150,358	100,418	100,468		75,425
Short term investments	0
Receivables, Net, Current	15,933	23,018
Inventory, Net	190,253	264,161
Prepaid Expense and Other Assets, Current	41,455	43,617
Assets, Current	397,999	431,214
Property, Plant and Equipment, Net	6,442,623	6,709,398
Investment in subsidiaries	0
Due from Affiliate, Noncurrent	2,021,110	1,953,719
Notes Receivable, Related Parties	0
Prepaid Expense and Other Assets, Noncurrent	300,058	311,463
Assets, Noncurrent		2,265,182
Total assets	9,161,790	9,405,794
Liabilities and Stockholders’ Equity
Accounts payable	156,664	158,224
Accrued Expenses Derivatives And Other Liabilities Current		228,664
Accrued expenses and other current liabilities	220,017
Debt, Current	9,260	4,611
Liabilities, Current	385,941	391,499
Long-term Debt, Excluding Current Maturities	38,646	18,169
Notes Payable		675,000
Notes Payable, Related Parties	675,000
Mine Reclamation and Closing Liability, Noncurrent	397,915	401,618
Defined Benefit Pension Plan, Liabilities, Noncurrent	10,293	(686)
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent	28,238	27,176
Accrued workers’ compensation	85,119	56,516
Other noncurrent liabilities	102,461	121,794
Liabilities	1,723,613	1,691,086
Stockholders' Equity Attributable to Parent	7,438,177	7,714,708
Liabilities and Equity	9,161,790	9,405,794
Non-Guarantor Subsidiaries [Member]
Assets
Cash and cash equivalents	11,688	11,348	$ 12,841		$ 1,349
Short term investments	0
Receivables, Net, Current	211,043	197,015
Inventory, Net	0
Prepaid Expense and Other Assets, Current	6,630	806
Assets, Current	229,361	209,169
Property, Plant and Equipment, Net	2	37
Investment in subsidiaries	0
Due from Affiliate, Noncurrent	0
Notes Receivable, Related Parties	0
Prepaid Expense and Other Assets, Noncurrent	1,572	86
Assets, Noncurrent		86
Total assets	230,935	209,292
Liabilities and Stockholders’ Equity
Accounts payable	55	137
Accrued Expenses Derivatives And Other Liabilities Current		781
Accrued expenses and other current liabilities	1,095
Debt, Current	0
Liabilities, Current	1,150	918
Long-term Debt, Excluding Current Maturities	0
Intercompany payables	203,355	181,095
Notes Payable, Related Parties	0
Mine Reclamation and Closing Liability, Noncurrent	0
Defined Benefit Pension Plan, Liabilities, Noncurrent	0
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent	0
Accrued workers’ compensation	0
Deferred income taxes	0
Other noncurrent liabilities	386	398
Liabilities	204,891	182,411
Stockholders' Equity Attributable to Parent	26,044	26,881
Liabilities and Equity	230,935	209,292
Eliminations [Member]
Assets
Cash and cash equivalents	0
Short term investments	0
Receivables, Net, Current	(4,615)	(4,637)
Inventory, Net	0
Prepaid Expense and Other Assets, Current	0
Assets, Current	(4,615)	(4,637)
Property, Plant and Equipment, Net	363
Investment in subsidiaries	(7,464,221)	(7,741,589)
Due from Affiliate, Noncurrent	(2,021,110)	(1,953,719)
Notes Receivable, Related Parties	(675,000)	(675,000)
Prepaid Expense and Other Assets, Noncurrent	0
Assets, Noncurrent		(10,370,308)
Total assets	(10,164,583)	(10,374,945)
Liabilities and Stockholders’ Equity
Accounts payable	0
Accrued Expenses Derivatives And Other Liabilities Current		(4,637)
Accrued expenses and other current liabilities	(4,615)
Debt, Current	0
Liabilities, Current	(4,615)	(4,637)
Long-term Debt, Excluding Current Maturities	0
Intercompany payables	(2,021,110)	(1,953,719)
Notes Payable		(675,000)
Notes Payable, Related Parties	(675,000)
Mine Reclamation and Closing Liability, Noncurrent	0
Defined Benefit Pension Plan, Liabilities, Noncurrent	0
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent	0
Accrued workers’ compensation	0
Deferred income taxes	0
Other noncurrent liabilities	0
Liabilities	(2,700,725)	(2,633,356)
Stockholders' Equity Attributable to Parent	(7,463,858)	(7,741,589)
Liabilities and Equity	$ (10,164,583)	$ (10,374,945)

Supplemental Consolidating Financial Information (Schedule of Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash provided by (used in) operating activities	$ (33,582)	$ 55,742	$ 332,804
Investing Activities
Capital expenditures	(147,286)	(296,984)	(395,225)
Minimum royalty payments	(7,317)	(14,947)	(13,269)
Proceeds from disposals and divestitures	62,358	433,453	22,825
Proceeds from sale-leaseback transactions	0	34,919
Purchases of short term investments	(211,929)	(213,726)	(236,862)
Proceeds from sales of short term investments	205,611	194,537	1,754
Proceeds from Sale of Available-for-sale Securities, Equity	9,464	0	0
Investments in and advances to affiliates, net	(16,657)	(15,260)	(17,758)
Change in restricted cash	0	3,453	6,869
Purchase of noncontrolling interest	0	0	17,500
Cash provided by (used in) investing activities	(105,756)	125,445	(649,166)
Financing Activities
Proceeds from Issuance of Long-term Debt		644,000	1,993,253
Payments to retire debt		(628,660)	(452,934)
Payments on term loan	(19,500)	(17,250)	(7,625)
Net payments on other debt	(5,695)	(6,836)	(682)
Net decrease in borrowings under lines of credit	0		(481,300)
Debt financing costs	(4,519)	(20,489)	(50,568)
Dividends paid	(2,123)	(25,475)	(42,440)
Proceeds from (Payments for) Other Financing Activities	(5,693)	0	0
Proceeds from exercise of options under incentive plans			5,131
Cash provided by (used in) financing activities	(37,530)	(54,710)	962,835
Increase (decrease) in cash and cash equivalents	(176,868)	126,477	646,473
Cash and cash equivalents, beginning of period	911,099	784,622	138,149
Cash and cash equivalents, end of period	734,231	911,099	784,622
Parent/Issuer [Member]
Cash provided by (used in) operating activities	(324,688)	(632,060)	(571,576)
Investing Activities
Capital expenditures	(2,700)	(3,320)	(4,424)
Proceeds from disposals and divestitures	57,625	0	0
Purchases of short term investments	(211,929)	(213,726)	(236,862)
Proceeds from sales of short term investments	205,611	194,537	1,754
Proceeds from Sale of Available-for-sale Securities, Equity	9,464
Investments in and advances to affiliates, net	(2,541)	(5,451)	(6,287)
Change in restricted cash		3,453	6,869
Purchase of noncontrolling interest			17,500
Cash provided by (used in) investing activities	55,530	(24,507)	(256,450)
Financing Activities
Proceeds from Issuance of Long-term Debt		644,000	1,993,253
Payments to retire debt		(628,660)
Payments on term loan	(19,500)	(17,250)	(7,625)
Net payments on other debt	(1,258)	(6,324)	(682)
Net decrease in borrowings under lines of credit			(375,000)
Debt financing costs	(2,219)	(19,864)	(50,022)
Dividends paid	(2,123)	(25,475)	(42,440)
Proceeds from (Payments for) Other Financing Activities	(15)
Proceeds from exercise of options under incentive plans			5,131
Transactions with affiliates, net	67,125	838,160	(84,651)
Cash provided by (used in) financing activities	42,010	784,587	1,437,964
Increase (decrease) in cash and cash equivalents	(227,148)	128,020	609,938
Cash and cash equivalents, beginning of period	799,333	671,313	61,375
Cash and cash equivalents, end of period	572,185	799,333	671,313
Guarantor Subsidiaries [Member]
Cash provided by (used in) operating activities	305,048	637,193	781,551
Investing Activities
Capital expenditures	(144,586)	(293,664)	(390,801)
Minimum royalty payments	(7,317)	(14,947)	(13,269)
Proceeds from disposals and divestitures	4,733	433,453	1,328
Proceeds from sale-leaseback transactions		34,919
Proceeds from Sale of Available-for-sale Securities, Equity	0
Investments in and advances to affiliates, net	(14,116)	(10,321)	(13,134)
Purchase of noncontrolling interest			0
Cash provided by (used in) investing activities	(161,286)	149,440	(415,876)
Financing Activities
Proceeds from Contributions from Parent		512	1,663
Proceeds from Issuance of Long-term Debt		0	0
Payments to retire debt			(452,934)
Payments on term loan	0	0	0
Net payments on other debt	(4,437)	(512)
Debt financing costs	0	0	0
Dividends paid	0
Proceeds from (Payments for) Other Financing Activities	0
Transactions with affiliates, net	(89,385)	(786,683)	110,639
Cash provided by (used in) financing activities	(93,822)	(786,683)	(340,632)
Increase (decrease) in cash and cash equivalents	49,940	(50)	25,043
Cash and cash equivalents, beginning of period	100,418	100,468	75,425
Cash and cash equivalents, end of period	150,358	100,418	100,468
Non-Guarantor Subsidiaries [Member]
Cash provided by (used in) operating activities	(13,942)	50,609	122,829
Investing Activities
Proceeds from disposals and divestitures	0	0	21,497
Proceeds from Sale of Available-for-sale Securities, Equity	0
Purchase of noncontrolling interest			0
Cash provided by (used in) investing activities			21,497
Financing Activities
Proceeds from Issuance of Long-term Debt		0	0
Payments on term loan	0	0	0
Net decrease in borrowings under lines of credit			(106,300)
Debt financing costs	(2,300)	(625)	(546)
Proceeds from (Payments for) Other Financing Activities	(5,678)
Transactions with affiliates, net	22,260	(51,477)	(25,988)
Cash provided by (used in) financing activities	14,282	(52,102)	(132,834)
Increase (decrease) in cash and cash equivalents	340	(1,493)	11,492
Cash and cash equivalents, beginning of period	11,348	12,841	1,349
Cash and cash equivalents, end of period	11,688	11,348	12,841
Eliminations [Member]
Investing Activities
Proceeds from disposals and divestitures	0	0	0
Proceeds from Sale of Available-for-sale Securities, Equity	0
Investments in and advances to affiliates, net		512	1,663
Purchase of noncontrolling interest			0
Cash provided by (used in) investing activities		512	1,663
Financing Activities
Proceeds from Contributions from Parent		(512)	(1,663)
Proceeds from Issuance of Long-term Debt		0	0
Payments on term loan	0	0	0
Debt financing costs	0	0	0
Dividends paid	0
Proceeds from (Payments for) Other Financing Activities	0
Cash provided by (used in) financing activities		$ (512)	$ (1,663)
Cash and cash equivalents, end of period	$ 0

Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other assets — other notes and accounts receivable
Reserves deducted from asset accounts:
Balance at Beginning of Year	$ 775	$ 1,043	$ 17
Additions (Reductions) Charged to Costs and Expenses	0	346	1,039
Charged to Other Accounts	0	0	0
Deductions	616	614	13
Balance at End of Year	159	775	1,043
Current assets — supplies and inventory
Reserves deducted from asset accounts:
Balance at Beginning of Year	8,446	12,589	13,107
Additions (Reductions) Charged to Costs and Expenses	580	503	1,961
Charged to Other Accounts	(76)	(2,274)	0
Deductions	2,325	2,372	2,479
Balance at End of Year		8,446	12,589
Deferred income taxes
Reserves deducted from asset accounts:
Balance at Beginning of Year	43,322	34,663	2,831
Additions (Reductions) Charged to Costs and Expenses		8,659	31,832
Charged to Other Accounts	0	0	0
Deductions	0	0	0
Balance at End of Year	$ 270,251	$ 43,322	$ 34,663

Label	Element	Value
Dividends, Common Stock	us-gaap_DividendsCommonStock	$ 42,440,000
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	11,822,000
Stock Issued During Period, Value, Stock Options Exercised	us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised	5,131,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	us-gaap_ComprehensiveIncomeNetOfTax	(692,512,000)
Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock	us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock	(5,474,000)
Common Stock [Member]
Dividends, Common Stock	us-gaap_DividendsCommonStock	0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	0
Stock Issued During Period, Value, Stock Options Exercised	us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised	5,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	2,136,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	us-gaap_ComprehensiveIncomeNetOfTax	0
Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock	us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock	0
Additional Paid-in Capital [Member]
Dividends, Common Stock	us-gaap_DividendsCommonStock	0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	11,822,000
Stock Issued During Period, Value, Stock Options Exercised	us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised	5,126,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	3,015,349,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	us-gaap_ComprehensiveIncomeNetOfTax	0
Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock	us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock	(5,474,000)
Treasury Stock [Member]
Dividends, Common Stock	us-gaap_DividendsCommonStock	0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	0
Stock Issued During Period, Value, Stock Options Exercised	us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised	0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	(53,848,000)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	us-gaap_ComprehensiveIncomeNetOfTax	0
Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock	us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock	0
Accumulated Other Comprehensive Income (Loss) [Member]
Dividends, Common Stock	us-gaap_DividendsCommonStock	0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	0
Stock Issued During Period, Value, Stock Options Exercised	us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised	0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	(7,950,000)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	us-gaap_ComprehensiveIncomeNetOfTax	(8,557,000)
Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock	us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock	0
Retained Earnings [Member]
Dividends, Common Stock	us-gaap_DividendsCommonStock	42,440,000
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	0
Stock Issued During Period, Value, Stock Options Exercised	us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised	0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	622,353,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	us-gaap_ComprehensiveIncomeNetOfTax	(683,955,000)
Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock	us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock	$ 0

Employee Benefit Plans (Schedule of Allocation of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		$ 347,952
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 89,982	114,977
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	228,657	215,958
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	18,070	17,017
U.S. Small-Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	16,512	14,901
U.S. Small-Cap [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	16,512	14,901
U.S. Mid-Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	46,481	62,271
U.S. Mid-Cap [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	17,301	28,654
U.S. Mid-Cap [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	29,180	33,617
U.S. Large-Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	89,008	110,947
U.S. Large-Cap [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	43,181	53,708
U.S. Large-Cap [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	45,827	57,239
Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	25,905	29,165
Non-U.S. [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	25,905	29,165
U.S. Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	13,708	18,545
U.S. Government Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	12,988	17,714
U.S. Government Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		831
Non-U.S. Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	1,599	2,143
Non-U.S. Government Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	1,599	2,143
U.S. governement asset and mortgage backed securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	830	600
U.S. governement asset and mortgage backed securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	830	600
Corporate fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	22,702	9,902
Corporate fixed income [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	22,702	9,902
State and Local Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	8,005	8,301
State and Local Government Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	8,005	8,301
Other fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	83,735	58,093
Other fixed income [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	83,735	58,093
Short-term Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	6,818	14,663
Short-term Investments [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	6,818	14,663
Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	21,406	18,421
Other Investments [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	3,336	1,404
Other Investments [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 18,070	$ 17,017