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Document And Entity Information - shares	3 Months Ended
Document And Entity Information - shares	Mar. 31, 2017	Apr. 27, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	ARCH COAL INC
Entity Central Index Key	0001037676
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		25,021,079

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Costs, expenses and other operating
Asset impairment and mine closure costs		$ 85,500
Successor [Member]
Revenues	$ 600,975
Costs, expenses and other operating
Cost of sales (exclusive of items shown separately below)	461,410
Depreciation, depletion and amortization	31,921
Accretion on asset retirement obligations	7,623
Amortization of sales contracts, net	14,690
Change in fair value of coal derivatives and coal trading activities, net	854
Asset impairment and mine closure costs	0
Selling, general and administrative expenses	20,523
Other operating income, net	(2,310)
Total operating expenses	534,711
Income (loss) from operations	66,264
Interest expense, net
Interest expense	(9,425)
Interest and investment income	527
Interest expense, net	(8,898)
Income (loss) before nonoperating expenses	57,366
Nonoperating expenses
Net loss resulting from early retirement of debt and debt restructuring	(2,030)
Reorganization items, net	(2,828)
Nonoperating income (expense)	(4,858)
Income (loss) before income taxes	52,508
Provision for (benefit from) income taxes	840
Net income (loss)	$ 51,668
Net income (loss) per common share
Basic earnings (loss) per common share (in dollars per share)	$ 2.07
Diluted earnings (loss) per common share (in dollars per share)	$ 2.03
Weighted average shares outstanding
Basic weighted average shares outstanding (shares)	25,008
Diluted weighted average shares outstanding (shares)	25,408
Predecessor [Member]
Revenues		428,106
Costs, expenses and other operating
Cost of sales (exclusive of items shown separately below)		411,010
Depreciation, depletion and amortization		63,699
Accretion on asset retirement obligations		8,306
Amortization of sales contracts, net		(833)
Change in fair value of coal derivatives and coal trading activities, net		1,210
Asset impairment and mine closure costs		85,520
Selling, general and administrative expenses		19,826
Other operating income, net		(2,220)
Total operating expenses		586,518
Income (loss) from operations		(158,412)
Interest expense, net
Interest expense		(44,451)
Interest and investment income		1,138
Interest expense, net		(43,313)
Income (loss) before nonoperating expenses		(201,725)
Nonoperating expenses
Net loss resulting from early retirement of debt and debt restructuring		(2,213)
Reorganization items, net		(3,875)
Nonoperating income (expense)		(6,088)
Income (loss) before income taxes		(207,813)
Provision for (benefit from) income taxes		(1,111)
Net income (loss)		$ (206,702)
Net income (loss) per common share
Basic earnings (loss) per common share (in dollars per share)		$ (9.71)
Diluted earnings (loss) per common share (in dollars per share)		$ (9.71)
Weighted average shares outstanding
Basic weighted average shares outstanding (shares)		21,293
Diluted weighted average shares outstanding (shares)		21,293

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Successor [Member]
Net income (loss)	$ 51,668
Derivative instruments
Comprehensive income (loss) before tax	19
Income tax benefit (provision)	0
Derivatives qualifying as hedges, adjustment, net of tax	19
Pension, postretirement and other post-employment benefits
Comprehensive income (loss) before tax	0
Income tax benefit (provision)	0
Pension and other postretirement benefit plans, adjustment, net of tax	0
Available-for-sale securities
Comprehensive income (loss) before tax	(387)
Income tax benefit (provision)	0
Available-for-sale securities adjustment, net of tax	(387)
Total other comprehensive income (loss)	(368)
Total comprehensive income (loss)	$ 51,300
Predecessor [Member]
Net income (loss)		$ (206,702)
Derivative instruments
Comprehensive income (loss) before tax		(224)
Income tax benefit (provision)		81
Derivatives qualifying as hedges, adjustment, net of tax		(143)
Pension, postretirement and other post-employment benefits
Comprehensive income (loss) before tax		(1,338)
Income tax benefit (provision)		481
Pension and other postretirement benefit plans, adjustment, net of tax		(857)
Available-for-sale securities
Comprehensive income (loss) before tax		2,903
Income tax benefit (provision)		(1,043)
Available-for-sale securities adjustment, net of tax		1,860
Total other comprehensive income (loss)		860
Total comprehensive income (loss)		$ (205,842)

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 347,580	$ 305,372
Short term investments	122,505	88,072
Restricted cash	68,984	71,050
Trade accounts receivable	150,399	184,483
Other receivables	22,482	19,877
Inventories	125,194	113,462
Other current assets	74,063	96,306
Total current assets	911,207	878,622
Property, plant and equipment, net	1,027,288	1,053,603
Other assets
Equity investments	104,144	96,074
Other noncurrent assets	102,277	108,298
Total other assets	206,421	204,372
Total assets	2,144,916	2,136,597
Current Liabilities
Accounts payable	103,130	95,953
Accrued expenses and other current liabilities	172,898	205,240
Current maturities of debt	7,898	11,038
Total current liabilities	283,926	312,231
Long-term debt	318,030	351,841
Asset retirement obligations	339,865	337,227
Accrued pension benefits	37,510	38,884
Accrued postretirement benefits other than pension	101,786	101,445
Accrued workers’ compensation	184,792	184,568
Other noncurrent liabilities	77,301	63,824
Total liabilities	1,343,210	1,390,020
Stockholders' equity
Common stock, $0.01 par value, authorized 300,000 shares, issued 25,021 shares and 25,002 shares at March 31, 2017 and December 31, 2016, respectively	250	250
Paid-in capital	692,253	688,424
Retained earnings	85,117	33,449
Accumulated other comprehensive income	24,086	24,454
Total stockholders’ equity	801,706	746,577
Total liabilities and stockholders’ equity	$ 2,144,916	$ 2,136,597

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	25,021,000	25,002,000

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Financing activities
Debt financing costs	$ (2,000)	$ (2,200)
Cash and cash equivalents, beginning of period	305,372
Cash and cash equivalents, end of period	347,580
Successor [Member]
Operating activities
Net income (loss)	51,668
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation, depletion and amortization	31,921
Accretion on asset retirement obligations	7,623
Amortization of sales contracts, net	14,690
Prepaid royalties expensed	2,281
Deferred income taxes	5,830
Employee stock-based compensation expense	2,426
Gains on disposals and divestitures, net	(347)
Asset impairment and non-cash mine closure costs	0
Net loss resulting from early retirement of debt and debt restructuring	2,030
Non-cash bankruptcy reorganization items	0
Amortization relating to financing activities	535
Changes in:
Receivables	37,134
Inventories	(11,732)
Accounts payable, accrued expenses and other current liabilities	(20,529)
Income taxes, net	(4,965)
Other	6,964
Cash provided by (used in) operating activities	125,529
Investing activities
Capital expenditures	(5,950)
Minimum royalty payments	(63)
Proceeds from disposals and divestitures	420
Purchases of short term investments	(78,523)
Proceeds from sales of short term investments	45,886
Investments in and advances to affiliates, net	(7,905)
Withdrawals (deposits) of restricted cash	2,066
Cash used in investing activities	(44,069)
Financing activities
Proceeds from issuance of term loan due 2024	298,500
Payments to extinguish term loan due 2021	(325,684)
Net payments on other debt	(2,810)
Debt financing costs	(7,228)
Net loss resulting from early retirement of debt and debt restructuring	(2,030)
Cash used in financing activities	(39,252)
Increase (decrease) in cash and cash equivalents	42,208
Cash and cash equivalents, beginning of period	305,372
Cash and cash equivalents, end of period	$ 347,580
Predecessor [Member]
Operating activities
Net income (loss)		(206,702)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation, depletion and amortization		63,699
Accretion on asset retirement obligations		8,306
Amortization of sales contracts, net		(833)
Prepaid royalties expensed		1,286
Deferred income taxes		(429)
Employee stock-based compensation expense		1,003
Gains on disposals and divestitures, net		1
Asset impairment and non-cash mine closure costs		77,550
Net loss resulting from early retirement of debt and debt restructuring		2,213
Non-cash bankruptcy reorganization items		(13,892)
Amortization relating to financing activities		3,150
Changes in:
Receivables		7,815
Inventories		734
Accounts payable, accrued expenses and other current liabilities		39,441
Income taxes, net		(642)
Other		7,202
Cash provided by (used in) operating activities		(10,098)
Investing activities
Capital expenditures		(5,926)
Minimum royalty payments		(71)
Proceeds from disposals and divestitures		0
Purchases of short term investments		(55,132)
Proceeds from sales of short term investments		56,134
Investments in and advances to affiliates, net		(2,156)
Withdrawals (deposits) of restricted cash		(12,108)
Cash used in investing activities		(19,259)
Financing activities
Net payments on other debt		(5,410)
Debt financing costs		(18,403)
Net loss resulting from early retirement of debt and debt restructuring		(2,213)
Cash used in financing activities		(26,026)
Increase (decrease) in cash and cash equivalents		(55,383)
Cash and cash equivalents, beginning of period		450,781
Cash and cash equivalents, end of period		$ 395,398

Basis of Presentation	3 Months Ended
Basis of Presentation	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements include the accounts of Arch Coal, Inc. ("Arch Coal") and its subsidiaries (the “Company”). Unless the context indicates otherwise, the terms “Arch” and the “Company” are used interchangeably in this Quarterly Report on Form 10-Q refer to both the Predecessor and Successor 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, Virginia, Illinois, Wyoming and Colorado. All subsidiaries are wholly-owned. Intercompany transactions and accounts have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial reporting and U.S. Securities and Exchange Commission regulations. In the opinion of management, all adjustments, consisting of normal, recurring accruals considered necessary for a fair presentation, have been included. Results of operations for the three months ended March 31, 2017 are not necessarily indicative of results to be expected for the year ending December 31, 2017. These financial statements should be read in conjunction with the audited financial statements and related notes as of and for the year ended December 31, 2016 included in the Company’s Annual Report on Form 10-K filed with the U.S. Securities and Exchange Commission. On January 11, 2016 (the “Petition Date”), Arch Coal and substantially all of its wholly owned domestic subsidiaries (the “Filing Subsidiaries” and, together with Arch Coal, the “Debtors”; the Debtors, solely following the effective date of the Plan, the “Reorganized Debtors”) filed voluntary petitions for reorganization (collectively, the “Bankruptcy Petitions”) under Chapter 11 of Title 11 of the U.S. Code (the “Bankruptcy Code”) in the United States Bankruptcy Court for the Eastern District of Missouri (the “Court”). The Debtors’ Chapter 11 Cases (collectively, the “Chapter 11 Cases”) were jointly administered under the caption In re Arch Coal, Inc., et al. Case No. 16-40120 (lead case). During the Chapter 11 Cases, each Debtor operated its business as a “debtor in possession” under the jurisdiction of the Court and in accordance with the applicable provisions of the Bankruptcy Code and the orders of the Court. Upon emergence from bankruptcy on October 5, 2016, Arch Coal applied the provisions of fresh start accounting effective October 1, 2016 which resulted in Arch becoming a new entity for financial reporting purposes. Accordingly, the consolidated financial statements and accompanying footnotes on or after October 1, 2016 are not comparable to the consolidated financial statements prior to that date. References to “Successor” in the consolidated financial statements and footnotes are in reference to reporting dates on or after October 2, 2016; references to “Predecessor” in the consolidated financial statements and footnotes are in reference to reporting dates through October 1, 2016 which includes the impact of the Plan provisions and the application of fresh start accounting.

Accounting Policies	3 Months Ended
Accounting Policies	Mar. 31, 2017
Accounting Policies [Abstract]
Accounting Policies	Accounting Policies Recently Adopted Accounting Guidance In March 2016, the FASB issued Accounting Standards Update No. 2016-09, Compensation – Stock Compensation (Topic 718) ("ASU 2016-09"). ASU 2016-09 identifies areas for simplification involving several aspects of accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, an option to recognize gross stock compensation expense with actual forfeitures recognized as they occur, as well as certain classifications on the statement of cash flows. The Company adopted all provisions of this new accounting standard in the first quarter of 2017 and changed its forfeiture policy to recognizing the impact of forfeitures when they occur from estimating expected forfeitures in determining stock-based compensation expense. There was no material impact to the Company's financial statements. Recent Accounting Guidance Issued Not Yet Effective In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers.” ASU 2014-09 is a comprehensive revenue recognition standard that will supersede nearly all existing revenue recognition guidance under current U.S. GAAP and replace it with a principle based approach for determining revenue recognition. ASU 2014-09 will require that companies recognize revenue based on the value of transferred goods or services as they occur in the contract. The ASU also will require additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. ASU 2014-09 is effective for interim and annual periods beginning after December 15, 2017. Early adoption is permitted only in annual reporting periods beginning after December 15, 2016, including interim periods therein. Entities will be able to transition to the standard either retrospectively or as a cumulative-effect adjustment as of the date of adoption. The Company’s primary source of revenue is from the sale of coal through both short-term and long-term contracts with utilities, industrial customers and steel producers whereby revenue is currently recognized when risk of loss has passed to the customer. Upon adoption of this new standard, the Company believes that the timing of revenue recognition related to our coal sales will remain consistent with our current practice. The Company is currently evaluating other revenue streams to determine the potential impact related to the adoption of the standard, as well as potential disclosures required by the standard. The Company will be adopting the standard under the modified retrospective approach. In March 2017, the FASB issued ASU 2017-07, Compensation-Retirement Benefits (Topic 715) Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. ASU 2017-07 changes the income statement presentation of defined benefit plan expense by requiring separation between operating expense (service cost component) and non-operating expense (all other components, including interest cost, amortization of prior service cost, curtailments and settlements, etc.). The operating expense component is reported with similar compensation costs while the non-operating components are reported in Nonoperating expense. In addition, only the service cost component is eligible for capitalization as part of an asset such as inventory or property, plant and equipment. The Company is currently assessing the impact that adopting this new accounting standard will have on its consolidated financial statements. The ASU is effective for public companies for fiscal years beginning after December 15, 2017, and interim periods therein; early adoption is permitted.

Accumulated Other Comprehensive Income

3 Months Ended

Mar. 31, 2017

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Income

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



			Pension,
			Postretirement
			and Other					Accumulated
			Post-					Other
	Derivative		Employment		Available-for-			Comprehensive
	Instruments		Benefits		Sale Securities			Income
	(In thousands)
Balance at December 31, 2016	$	—	$	24,067	$	387		$	24,454
Unrealized gains (losses)	19		—		(55		)	(36		)
Amounts reclassified from AOCI	—		—		(332		)	(332		)
Balance at March 31, 2017	$	19	$	24,067	$	—		$	24,086

The following amounts were reclassified out of AOCI:



	Successor		Predecessor			Line Item in the Condensed Consolidated Statement of Operations
Details About AOCI Components	Three Months Ended March 31, 2017		Three Months Ended March 31, 2016
(In thousands)
Derivative instruments	$	—	$	226		Revenues
	—		(82		)	Provision for (benefit from) income taxes
	$	—	$	144		Net of tax

Pension, postretirement and other post-employment benefits
Amortization of prior service credits ⁽¹⁾	$	—	$	2,672
Amortization of actuarial gains (losses), net ⁽¹⁾	—		(1,334		)
	—		1,338
	—		(481		)	Provision for (benefit from) income taxes
	$	—	$	857		Net of tax

Available-for-sale securities	$	332	$	(2,895	)	Interest and investment income
	—		1,038			Provision for (benefit from) income taxes
	$	332	$	(1,857	)	Net of tax
¹ Production-related benefits and workers’ compensation costs are included in inventoriable production costs.

- 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=66004124&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 45
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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

Reorganization items, net	3 Months Ended
Reorganization items, net	Mar. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Reorganization items, net	Reorganization items, net In accordance with Accounting Codification Standard 852, “Reorganizations,” the statement of operations shall portray the results of operations of the reporting entity while it is in Chapter 11. Revenues, expenses (including professional fees), realized gains and losses, and provisions for losses resulting from reorganization and restructuring of the business shall be reported separately as reorganization items. During the three months ended March 31, 2017, the Company recorded a charge of $2.8 million in “Reorganization items, net” comprised of professional fee expense of $2.8 million. Net cash paid for “Reorganization items, net” totaled $3.7 million during the three months ended March 31, 2017. During the three months ended March 31, 2016, the Company recorded a charge of $3.9 million in “Reorganization items, net” comprised of professional fee expense of $17.8 million, partially offset by non-cash gains on rejected contracts of $13.9 million. Net cash paid for “Reorganization items, net” totaled $1.5 million during the three months ended March 31, 2016.

Asset Impairments and Mine Closure Costs	3 Months Ended
Asset Impairments and Mine Closure Costs	Mar. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Asset Impairment and Mine Closure Costs	Asset Impairment and Mine Closure Costs During the first quarter of 2016, the Company recorded $85.5 million of “Asset impairment and mine closure costs” in the Condensed Consolidated Statements of Operations. The amount included the following: a $74.1 million impairment of coal reserves and surface land in Kentucky that are being leased to a mining company that idled its mining operations related to those reserves during the quarter; $5.1 million of severance expense related to headcount reductions at Company operations; $3.4 million related to an impairment charge on the portion of an advance royalty balance on a reserve base mined at the Company’s Mountain Laurel operation that was no longer deemed recoupable; and $2.9 million related to an other-than-temporary-impairment charge on an available-for-sale security.

Inventories

3 Months Ended

Mar. 31, 2017

Inventory Disclosure [Abstract]

Inventories

Inventories consist of the following:



	March 31,		December 31,
	2017		2016
	(In thousands)
Coal	$	49,066	$	37,268
Repair parts and supplies	76,128		76,194
	$	125,194	$	113,462

The repair parts and supplies are stated net of an allowance for slow-moving and obsolete inventories of $0.1 million at March 31, 2017 and $0.0 million at December 31, 2016.

Investments in Available-for-Sale Securities

3 Months Ended

Mar. 31, 2017

Available-for-sale Securities [Abstract]

Investments in Available-for-Sale Securities

The Company has invested in marketable debt securities, primarily 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:



	March 31, 2017
										Balance Sheet
										Classification
			Gross Unrealized					Fair		Short-Term		Other
	Cost Basis		Gains		Losses			Value		Investments		Assets
	(In thousands)
Available-for-sale:
U.S. treasury securities	$	18,926	$	12	$	—		$	18,938	$	18,938	$	—
Corporate notes and bonds	103,639		21		(93		)	103,567		103,567		—
Total Investments	$	122,565	$	33	$	(93	)	$	122,505	$	122,505	$	—



	December 31, 2016
										Balance Sheet
										Classification
			Gross Unrealized					Fair		Short-Term		Other
	Cost Basis		Gains		Losses			Value		Investments		Assets
	(In thousands)
Available-for-sale:
Corporate notes and bonds	$	88,161	$	—	$	(89	)	$	88,072	$	88,072	$	—
Equity securities	1,749		388		—			2,137		—		2,137
Total Investments	$	89,910	$	388	$	(89	)	$	90,209	$	88,072	$	2,137

The aggregate fair value of investments with unrealized losses that were owned for less than a year was $59.4 million and $47.6 million at March 31, 2017 and December 31, 2016, respectively. The aggregate fair value of investments with unrealized losses that were owned for over a year was $16.0 million and $40.4 million at March 31, 2017 and December 31, 2016, respectively. The unrealized losses in the Company’s portfolio at March 31, 2017 are the result of normal market fluctuations. The Company does not currently intend to sell these investments before recovery of their amortized cost base.

The debt securities outstanding at March 31, 2017 have maturity dates ranging from the second quarter of 2017 through the third quarter of 2018. 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.

- Definition

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

+ References + Details

Sales Contracts

3 Months Ended

Mar. 31, 2017

Acquired Sales Contracts [Abstract]

Sales Contracts

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



	March 31, 2017								December 31, 2016
	Assets			Liabilities			Net Total		Assets			Liabilities			Net Total
	(In thousands)								(In thousands)
Original fair value	$	97,196		$	31,742				$	97,196		$	31,742
Accumulated amortization	(44,843		)	(29,356		)			(25,625		)	(24,829		)
Total	$	52,353		$	2,386		$	49,967	$	71,571		$	6,913		$	64,658
Balance Sheet classification:
Other current	$	43,238		$	817				$	59,702		$	5,114
Other noncurrent	$	9,115		$	1,569				$	11,869		$	1,799

The Company anticipates amortization of sales contracts, based upon expected shipments in the next five years, to be an expense of approximately $57.3 million in 2017, $11.5 million in 2018, income of $0.6 million in 2019, and income of $0.1 million in 2020 and 2021.

Derivatives

3 Months Ended

Mar. 31, 2017

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 38 to 44 million gallons of diesel fuel for use in its operations during 2017. To protect the Company’s cash flows from increases in the price of diesel fuel for its operations, the Company uses forward physical diesel purchase contracts and purchased heating oil call options. At March 31, 2017, the Company had protected the price of approximately 75% of its expected diesel fuel purchases for the remainder of 2017 at an average strike price of $1.77 per gallon. Additionally, the Company has protected approximately 12% of its expected 2018 purchases with call options with an average strike price of $1.92 per gallon. At March 31, 2017, the Company had outstanding heating oil call options for approximately 30 million gallons for the purpose of managing the price risk associated with future diesel purchases. These positions are not designated as hedges for accounting purposes, and therefore, changes in the fair value are recorded immediately to earnings.

Coal price 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, index-priced 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 March 31, 2017, the Company held derivatives for risk management purposes that are expected to settle in the following years:



(Tons in thousands)	2017	2018	Total
Coal sales	405	—	405
Coal purchases	360	—	360

The Company has also entered into a nominal quantity of natural gas put options to protect the Company from decreases in natural gas prices, which could impact thermal coal demand. These options are not designated as hedges. Additionally, the Company has also entered into a nominal quantity of foreign currency put options protecting for decreases in the Australian to United States dollar exchange rate, which could impact metallurgical coal demand. These options are not designated as hedges.

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 estimated future realization of the value of the trading portfolio is immaterial during the remainder of 2017 and $0.6 million of losses during the remainder of 2018.

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 Condensed 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 Condensed Consolidated Balance Sheets. The fair value and location of derivatives reflected in the accompanying Condensed Consolidated Balance Sheets are as follows:



	March 31, 2017								December 31, 2016
Fair Value of Derivatives	Asset			Liability					Asset			Liability
(In thousands)	Derivative			Derivative					Derivative			Derivative
Derivatives Designated as Hedging Instruments
Coal	$	9		$	—				$	—		$	(15	)

Derivatives Not Designated as Hedging Instruments
Heating oil -- diesel purchases	1,418			—					4,646			—
Coal -- held for trading purposes	43,157			(43,781		)			68,948			(68,740		)
Coal -- risk management	193			(271		)			475			(580		)
Natural gas	—			—					86			(13		)
Total	44,768			(44,052		)			74,155			(69,333		)
Total derivatives	44,777			(44,052		)			74,155			(69,348		)
Effect of counterparty netting	(43,359		)	43,359					(69,247		)	69,247
Net derivatives as classified in the balance sheets	$	1,418		$	(693	)	$	725	$	4,908		$	(101	)	$	4,807



		March 31, 2017			December 31, 2016
Net derivatives as reflected on the balance sheets (in thousands)
Heating oil and coal	Other current assets	$	1,418		$	4,908
Coal	Accrued expenses and other current liabilities	(693		)	(101		)
		$	725		$	4,807

The Company had a current asset for the right to reclaim cash collateral of $4.8 million at March 31, 2017 and $2.8 million at December 31, 2016, respectively. These amounts are not included with the derivatives presented in the table above and are included in “other current assets” in the accompanying Condensed Consolidated Balance Sheets.

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

Derivatives used in Cash Flow Hedging Relationships (in thousands)

Three Months Ended March 31,



		Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion)						Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)
		Successor			Predecessor			Successor		Predecessor
		2017			2016			2017		2016
Coal sales	⁽¹⁾	$	220		$	13		$	—	$	1,369
Coal purchases	⁽²⁾	(201		)	(11		)	—		(1,143		)
Totals		$	19		$	2		$	—	$	226

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 three month periods ended March 31, 2017 and 2016.

Derivatives Not Designated as Hedging Instruments (in thousands)

Three Months Ended March 31,



		Gain (Loss) Recognized
		Successor			Predecessor
		2017			2016
Coal — unrealized	⁽³⁾	$	26		$	(1,115	)
Coal — realized	⁽⁴⁾	$	—		$	163
Natural gas — unrealized	⁽³⁾	$	(469	)	$	(469	)
Heating oil — diesel purchases	⁽⁴⁾	$	(3,578	)	$	(443	)
Foreign currency	⁽⁴⁾	$	—		$	(171	)

____________________________________________________________

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) expense, net

Based on fair values at March 31, 2017, amounts on derivative contracts designated as hedge instruments in cash flow hedges to be reclassified from other comprehensive income into earnings during the next twelve months are immaterial.

Related to its trading portfolio, the Company recognized net unrealized and realized losses of $0.7 million and net unrealized and realized gains of $0.1 million during the three months ended March 31, 2017 and 2016, respectively. Gains and losses from trading activities are included in the caption “Change in fair value of coal derivatives and coal trading activities, net” in the accompanying Condensed Consolidated Statements of Operations, and are not included in the previous tables reflecting the effects of derivatives on measures of financial performance.

- 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

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+ Details

Accrued Expenses and Other Current Liabilities

3 Months Ended

Mar. 31, 2017

Payables and Accruals [Abstract]

Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consist of the following:



	March 31,		December 31,
	2017		2016
	(In thousands)
Payroll and employee benefits	$	41,663	$	58,468
Taxes other than income taxes	88,418		92,733
Interest	202		8,032
Acquired sales contracts	817		5,114
Workers’ compensation	16,046		15,184
Asset retirement obligations	19,340		19,515
Other	6,412		6,194
	$	172,898	$	205,240

Debt and Financing Arrangements

3 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

Debt and Financing Arrangements



	March 31,			December 31,
	2017			2016
	(In thousands)
Term loan due 2024 ($300.0 million face value)	298,512			—
Term loan due 2021 ($325.7 million face value)	—			325,684
Other	34,424			37,195
Debt issuance costs	(7,008		)	—
	325,928			362,879
Less: current maturities of debt	7,898			11,038
Long-term debt	$	318,030		$	351,841

On March 7, 2017, the Company entered into a new senior secured term loan credit agreement in an aggregate principal amount of $300 million (the “New Term Loan Debt Facility) with Credit Suisse AG, Cayman Islands Branch, as administrative agent and collateral agent (in such capacities, the “Agent”), and the other financial institutions from time to time party thereto (collectively, the “Lenders”). The New Term Loan Debt Facility was issued at 99.50% of the face amount and will mature on March 7, 2024.

Borrowings under the New Term Loan Debt Facility bear interest at a per annum rate equal to, at the Company’s option, either (i) a London interbank offered rate plus an applicable margin of 4%, subject to a 1% LIBOR floor (the “LIBOR Rate”), or (ii) a base rate plus an applicable margin of 3%. Interest payments will be payable in cash. The term loans provided under the New Term Loan Debt Facility (the “Term Loans”) are subject to quarterly principal amortization payments in an amount equal to $750,000.

The New Term Loan Debt Facility is guaranteed by all existing and future wholly owned domestic subsidiaries of the Company (collectively, the “Subsidiary Guarantors” and, together with Arch Coal, the “Loan Parties”), subject to customary exceptions, and is secured by first priority security interests on substantially all assets of the Loan Parties, including 100% of the voting equity interests of directly owned domestic subsidiaries and 65% of the voting equity interests of directly owned foreign subsidiaries, subject to customary exceptions.

The Company has the right to prepay Term Loans at any time and from time to time in whole or in part without premium or penalty, upon written notice, except that any prepayment of Term Loans that bear interest at the LIBOR Rate other than at the end of the applicable interest periods therefor shall be made with reimbursement for any funding losses and redeployment costs of the Lenders resulting therefrom.

The New Term Loan Debt Facility is subject to certain usual and customary mandatory prepayment events, including 100% of net cash proceeds of (i) debt issuances (other than debt permitted to be incurred under the terms of the New Term Loan Debt Facility) and (ii) non-ordinary course asset sales or dispositions, subject to customary thresholds, exceptions and reinvestment rights.

The New Term Loan Debt Facility contains customary affirmative covenants and representations.

The New Term Loan Debt Facility also contains customary negative covenants, which, among other things, and subject to certain exceptions, include restrictions on (i) indebtedness, (ii) liens, (iii) liquidations, mergers, consolidations and acquisitions, (iv) disposition of assets or subsidiaries, (v) affiliate transactions, (vi) creation or ownership of certain subsidiaries, partnerships and joint ventures, (vii) continuation of or change in business, (viii) restricted payments, (ix) prepayment of subordinated and junior lien indebtedness, (x) restrictions in agreements on dividends, intercompany loans and granting liens on the collateral, (xi) loans and investments, (xii) sale and leaseback transactions, (xiii) changes in organizational documents and fiscal year and (xiv) transactions with respect to bonding subsidiaries. The New Term Loan Debt Facility does not contain any financial maintenance covenant.

The New Term Loan Debt Facility contains customary events of default, subject to customary thresholds and exceptions, including, among other things, (i) nonpayment of principal and nonpayment of interest and fees, (ii) a material inaccuracy of a representation or warranty at the time made, (iii) a failure to comply with any covenant, subject to customary grace periods in the case of certain affirmative covenants, (iv) cross-events of default to indebtedness of at least $50 million, (v) cross-events of default to surety, reclamation or similar bonds securing obligations with an aggregate face amount of at least $50 million, (vi) uninsured judgments in excess of $50 million, (vii) any loan document shall cease to be a legal, valid and binding agreement, (viii) uninsured losses or proceedings against assets with a value in excess of $50 million, (ix) certain ERISA events, (x) a change of control or (xi) bankruptcy or insolvency proceedings relating to the Company or any material subsidiary of the Company.

On the effective date of the New Term Loan Debt Facility, all outstanding obligations under the Company’s previously existing term loan credit agreement, dated as of October 5, 2016, among the Company, as borrower, the lender party thereto and Wilmington Trust, National Association, as administrative agent and collateral agent (the “Previous First Lien Debt Facility”), other than indemnification and other contingent obligations, were paid in cash in full and the related transaction documents were terminated (other than with respect to certain provisions that customarily survive termination); there was no gain or loss recognized on the extinguishment of the previously existing term loan credit agreement. All liens on property of the Company and the guarantors thereunder arising out of or related to the Previous First Lien Debt Facility were terminated.

Financing Costs

The Company paid financing costs of $7.2 million during the three months ended March 31, 2017 related to the issuance of the New Term Loan Debt facility discussed above. These issuance costs were capitalized and will be amortized using the effective interest method over the term of the facility. During the three months ended March 31, 2016, the Company paid $18.4 million primarily related to the Superpriority Secured Debtor-in-Possession Credit Agreement related to the Company’s bankruptcy filing.

The Company incurred $2.0 million of legal and financial advisory fees associated with debt refinancing activities during the three months ended March 31, 2017; $1.0 million relates to fees associated with the extinguishment of the “Previous First Lien Debt Facility” while the remaining amount relates to financing fees incurred from our initial efforts to replace the existing accounts receivable securitization facility. The Company also incurred $2.2 million in debt restructuring costs during the three months ended March 31, 2016 related to debt restructuring activities prior to the Company’s Chapter 11 filing..

Contractual Interest Expense

The Company has recorded interest expense of $9.4 million for the three months ended March 31, 2017 compared to $44.5 million for the three months ended March 31, 2016, respectively. The reduction in interest expense in the current year is due to the Company’s bankruptcy filing during the prior year period. The contractual interest expense disclosed represents interest expense that the Company was obligated to pay prior to the bankruptcy filing.

Income Taxes

3 Months Ended

Mar. 31, 2017

Income Tax Disclosure [Abstract]

Income Taxes

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



	Successor			Predecessor
	Three Months Ended March 31, 2017			Three Months Ended March 31, 2016
(In thousands)
Income tax provision (benefit) at statutory rate	$	18,378		$	(72,735	)
Percentage depletion allowance	(7,039		)	(25,667		)
State taxes, net of effect of federal taxes	483			(4,490		)
Change in valuation allowance	(11,902		)	100,562
Other, net	920			1,219
	$	840		$	(1,111	)

Fair Value Measurements

3 Months Ended

Mar. 31, 2017

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 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 commodity contracts (coal and heating oil) 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, natural gas 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 a significant impact on the reported Level 3 fair values at March 31, 2017.

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



	March 31, 2017
	Total		Level 1		Level 2		Level 3
	(In thousands)
Assets:
Investments in marketable securities	$	122,505	$	18,938	$	103,567	$	—
Derivatives	1,418		—		—		1,418
Total assets	$	123,923	$	18,938	$	103,567	$	1,418
Liabilities:
Derivatives	$	693	$	644	$	—	$	49

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 Condensed 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.



	Three Months Ended March 31, 2017
	(In thousands)
Balance, beginning of period	$	4,537
Realized and unrealized gains recognized in earnings, net	(4,068		)
Purchases	1,395
Issuances	(182		)
Settlements	(313		)
Ending balance	$	1,369

Net unrealized losses of $2.8 million were recognized in the Condensed Consolidated Statement of Operations within Other operating income, net during the three months ended March 31, 2017 related to Level 3 financial instruments held on March 31, 2017.

Fair Value of Long-Term Debt

At March 31, 2017 and December 31, 2016, the fair value of the Company’s debt, including amounts classified as current, was $334.4 million and $362.9 million, 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

Earnings (loss) per common share

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Earnings (loss) per common share

Earnings (loss) per Common Share

The Company computes basic net income per share using the weighted average number of common shares outstanding during the period. Diluted net income per share is computed using the weighted average number of common shares and the effect of potentially dilutive securities outstanding during the period. Potentially dilutive securities may consist of warrants, restricted stock units or other contingently issuable shares. The dilutive effect of outstanding warrants, restricted stock units and other contingently issuable shares is reflected in diluted earnings per share by application of the treasury stock method.

The following table provides the basis for basic and diluted earnings (loss) per share by reconciling the numerators and denominators of the computations:



	Successor	Predecessor
	March 31, 2017	March 31, 2016
(In Thousands)
Weighted average shares outstanding:
Basic weighted average shares outstanding	25,008	21,293
Effect of dilutive securities	400	—

Diluted weighted average shares outstanding	25,408	21,293

Workers' Compensation Expense

3 Months Ended

Mar. 31, 2017

Workers' Compensation Expense

Workers Compensation Expense

The Company is liable under the Federal Mine Safety and Health Act of 1969, as subsequently amended, to provide for pneumoconiosis (occupational disease) benefits to eligible employees, former employees and dependents. The Company currently provides for federal claims principally through a self-insurance program. The Company is also liable under various state workers’ compensation statutes for occupational disease benefits. The occupational disease benefit obligation represents the present value of the of the actuarially computed present and future liabilities for such benefits over the employees’ applicable years of service.

In addition, the Company is liable for workers’ compensation benefits for traumatic injuries which are calculated using actuarially-based loss rates, loss development factors and discounted based on a risk free rate. Traumatic workers’ compensation claims are insured with varying retentions/deductibles, or through state-sponsored workers’ compensation programs.

Workers’ compensation expense consists of the following components:



	Successor		Predecessor
	Three Months Ended March 31, 2017		Three Months Ended March 31, 2016
(In thousands)
Self-insured occupational disease benefits:
Service cost	$	1,558	$	1,105
Interest cost	1,169		1,057
Net amortization	—		1,141
Total occupational disease	$	2,727	$	3,303
Traumatic injury claims and assessments	2,878		2,967
Total workers’ compensation expense	$	5,605	$	6,270

Employee Benefit Plans

3 Months Ended

Mar. 31, 2017

Pension and Other Postretirement Benefit Expense [Abstract]

Employee Benefit Plans

The following table details the components of pension benefit costs:



	Successor			Predecessor
	Three Months Ended March 31, 2017			Three Months Ended March 31, 2016
(In thousands)
Interest cost	2,991			3,338
Expected return on plan assets	(4,497		)	(4,538		)
Amortization of other actuarial losses	—			757
Net benefit credit	$	(1,506	)	$	(443	)

The following table details the components of other postretirement benefit costs (credits):



	Successor		Predecessor
	Three Months Ended March 31, 2017		Three Months Ended March 31, 2016
(In thousands)
Service cost	$	170	$	160
Interest cost	1,058		1,134
Amortization of prior service credits	—		(2,673		)
Amortization of other actuarial losses (gains)	—		(566		)
Net benefit cost (credit)	$	1,228	$	(1,945	)

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The Company accrues for costs 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. In addition, the Company is a party to numerous other claims and lawsuits with respect to various matters. As of March 31, 2017 and December 31, 2016, the Company had accrued $1.3 million and $2.2 million, respectively, for all legal matters, of which all amounts are 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.

Segment Information

3 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

Segment Information

The Company’s reportable business segments are based on two distinct lines of business, metallurgical and thermal, and may include a number of mine complexes. The Company manages its coal sales by market, not by individual mining complex. Geology, coal transportation routes to customers, and regulatory environments also have a significant impact on the Company’s marketing and operations management. Mining operations are evaluated based on Adjusted EBITDAR, per-ton cash operating costs (defined as including all mining costs except depreciation, depletion, amortization, accretion on asset retirements obligations, and pass-through transportation expenses), and on other non-financial measures, such as safety and environmental performance. Adjusted EBITDAR is not a measure of financial performance in accordance with generally accepted accounting principles, and items excluded from Adjusted EBITDAR are significant in understanding and assessing our financial condition. Therefore, Adjusted EBITDAR should not be considered in isolation, nor as an alternative to net income, income from operations, cash flows from operations or as a measure of our profitability, liquidity or performance under generally accepted accounting principles. The Company uses Adjusted EBITDAR to measure the operating performance of its segments and allocate resources to the segments. Furthermore, analogous measures are used by industry analysts and investors to evaluate the Company’s operating performance. Investors should be aware that the Company’s presentation of Adjusted EBITDAR may not be comparable to similarly titled measures used by other companies. The Company reports its results of operations primarily through the following reportable segments: Powder River Basin (PRB) segment containing the Company’s primary thermal operations in Wyoming; the Metallurgical (MET) segment, containing the Company’s metallurgical operations in West Virginia, Kentucky, and Virginia, and the Other Thermal segment containing the Company’s supplementary thermal operations in Colorado, Illinois, and West Virginia. Periods presented in this note have been recast for comparability.

Operating segment results for the Successor period, the three months ended March 31, 2017, and the Predecessor period, the three months ended March 31, 2016, are presented below. The Company measures its segments based on “adjusted earnings before interest, taxes, depreciation, depletion, amortization, accretion on asset retirements obligations, and reorganization items, net (Adjusted EBITDAR).” Adjusted EBITDAR does not reflect mine closure or impairment costs, since those are not reflected in the operating income reviewed by management. See Note 5, “Asset Impairment 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.



	PRB		MET		Other Thermal		Corporate, Other and Eliminations			Consolidated
Successor Period	(in thousands)
Three Months Ended March 31, 2017
Revenues	$	273,428	$	225,582	$	101,906	$	59		$	600,975
Adjusted EBITDAR	48,006		68,310		27,242		(23,060		)	120,498
Depreciation, depletion and amortization	9,510		18,764		3,200		447			31,921
Accretion on asset retirement obligation	5,040		528		540		1,515			7,623
Capital expenditures	128		4,610		741		471			5,950

Predecessor Period
Three Months Ended March 31, 2016
Revenues	$	223,122	$	136,583	$	56,132	$	12,269		$	428,106
Adjusted EBITDAR	12,728		6,352		3,151		(23,951		)	(1,720		)
Depreciation, depletion and amortization	32,760		19,345		9,891		1,703			63,699
Accretion on asset retirement obligation	5,647		588		663		1,408			8,306
Capital expenditures	10		3,604		1,945		367			5,926

A reconciliation of adjusted EBITDAR to consolidated loss before income taxes follows:



	Successor			Predecessor
	Three Months Ended March 31,			Three Months Ended March 31,
	2017			2016
(In thousands)
Adjusted EBITDAR	$	120,498		$	(1,720	)
Depreciation, depletion and amortization	(31,921		)	(63,699		)
Accretion on asset retirement obligations	(7,623		)	(8,306		)
Amortization of sales contracts, net	(14,690		)	833
Asset impairment and mine closure costs	—			(85,520		)
Interest expense, net	(8,898		)	(43,313		)
Net loss resulting from early retirement of debt and debt restructuring	(2,030		)	(2,213		)
Reorganization items, net	(2,828		)	(3,875		)
Income (loss) before income taxes	$	52,508		$	(207,813	)

- 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
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-Name Accounting Standards Codification
-Topic 280
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-Section 50
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events New Inventory Facility On April 27, 2017, the Company and certain subsidiaries of Arch Coal entered into a new senior secured inventory-based revolving credit facility in an aggregate principal amount of $40 million (the “New Inventory Facility”) with Regions Bank (“Regions”) as administrative agent and collateral agent (in such capacities, the “Agent”), as lender and swingline lender (in such capacities, the “Lender”) and as letter of credit issuer. Availability under the New Inventory Facility is subject to a borrowing base consisting of (i) 85% of the net orderly liquidation value of eligible coal inventory, (ii) the lesser of (x) 85% of the net orderly liquidation value of eligible parts and supplies inventory and (y) 35% of the amount determined pursuant to clause (i), and (iii) 100% of Arch Coal’s Eligible Cash (defined in the New Inventory Facility), subject to reduction for reserves imposed by Regions. The commitments under the New Inventory Facility will terminate on the date that is the earliest to occur of (i) the third anniversary of the Inventory Facility Closing Date, (ii) the date, if any, that is 364 days following the first day that Liquidity (defined in the New Inventory Facility and consistent with the definition in the Extended Securitization Facility (as defined below)) is less than $250 million for a period of 60 consecutive days and (iii) the date, if any, that is 60 days following the maturity, termination or repayment in full of the Extended Securitization Facility. Revolving loan borrowings under the New Inventory Facility bear interest at a per annum rate equal to, at the option of Arch Coal, either at the base rate or the London interbank offered rate plus, in each case, a margin ranging from 2.25% to 2.50% (in the case of LIBOR loans) and 1.25% to 1.50% (in the case of base rate loans) determined using a Liquidity-based grid. Letters of credit under the New Inventory Facility are subject to a fee in an amount equal to the applicable margin for LIBOR loans, plus customary fronting and issuance fees. All existing and future direct and indirect domestic subsidiaries of Arch Coal, subject to customary exceptions, will either constitute co-borrowers under or guarantors of the New Inventory Facility (collectively with Arch Coal, the “Loan Parties”). The New Inventory Facility is secured by first priority security interests in the ABL Priority Collateral (defined in the New Inventory Facility) of the Loan Parties and second priority security interests in substantially all other assets of the Loan Parties, subject to customary exceptions (including an exception for the collateral that secures the Extended Securitization Facility). Arch Coal has the right to prepay borrowings under the New Inventory Facility at any time and from time to time in whole or in part without premium or penalty, upon written notice, except that any prepayment of such borrowings that bear interest at the LIBOR rate other than at the end of the applicable interest periods therefor shall be made with reimbursement for any funding losses and redeployment costs of the Lender resulting therefrom. The New Inventory Facility is subject to certain usual and customary mandatory prepayment events, including non-ordinary course asset sales or dispositions, subject to customary thresholds, exceptions (including exceptions for required prepayments under Arch Coal’s term loan facility) and reinvestment rights. The New Inventory Facility contains certain customary affirmative and negative covenants; events of default, subject to customary thresholds and exceptions; and representations, including certain cash management and reporting requirements that are customary for asset-based credit facilities. The New Inventory Facility also includes a requirement to maintain Liquidity equal to or exceeding $175 million at all times. Securitization Facility On April 27, 2017, the Company extended and amended its existing trade accounts receivable securitization facility provided to Arch Receivable Company, LLC, a special-purpose entity that is a wholly owned subsidiary of Arch Coal (“Arch Receivable”) (the “Extended Securitization Facility”), which supports the issuance of letters of credit and requests for cash advances. The amendment to the Extended Securitization Facility decreases the borrowing capacity from $200 million to $160 million and extends the maturity date to the date that is three years after the Securitization Facility Closing Date. Pursuant to the Extended Securitization Facility, Arch Receivable also agreed to a revised schedule of fees payable to the administrator and the providers of the Extended Securitization Facility. The Extended Securitization Facility will terminate at the earliest of (i) three years from the Securitization Facility Closing Date, (ii) if the Liquidity (defined in the Extended Securitization Facility and consistent with the definition in the New Inventory Facility) is less than $175 million for a period of 60 consecutive days, the date that is the 364th day after the first day of such 60 consecutive day period and (iii) the occurrence of certain predefined events substantially consistent with the existing transaction documents. Under the Extended Securitization Facility, Arch Receivable, Arch Coal and certain of Arch Coal’s subsidiaries party to the Extended Securitization Facility have granted to the administrator of the Extended Securitization Facility a first priority security interest in eligible trade accounts receivable generated by such parties from the sale of coal and all proceeds thereof. Share Repurchase and Common Stock Dividend On April 27, 2017, the board of directors of Arch Coal authorized a new share repurchase program for up to $300 million of its common stock, effective April 27, 2017. The timing of any purchases, and the ultimate number of shares to be purchased, will depend on market conditions. The shares will be acquired in the open market or through private transactions in accordance with Securities and Exchange Commission requirements. The Company had 25,021,079 common shares outstanding as of April 27, 2017. The purchases under the new share repurchase program may be made in the open market or through privately negotiated transactions from time to time and in accordance with applicable laws, rules and regulations. Repurchases may also be made pursuant to a Rule 10b5-1 plan, which, if adopted by Company, would permit shares to be repurchased in accordance with pre-determined criteria when the Company might otherwise be prohibited from doing so under insider trading laws or because of self-imposed trading blackout periods. The share repurchase program may be amended, suspended or discontinued at any time and does not commit the Company to repurchase shares of its common stock. The actual number and value of the shares to be purchased will depend on the performance of the Company’s stock price and other market conditions. On April 27, 2017, the board of directors also authorized a new quarterly common stock cash dividend of $0.35 per share. The dividend will be paid on June 15, 2017 to stockholders of record on May 31, 2017.

Basis of Presentation (Policies)	3 Months Ended
Basis of Presentation (Policies)	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial reporting and U.S. Securities and Exchange Commission regulations. In the opinion of management, all adjustments, consisting of normal, recurring accruals considered necessary for a fair presentation, have been included. Results of operations for the three months ended March 31, 2017 are not necessarily indicative of results to be expected for the year ending December 31, 2017. These financial statements should be read in conjunction with the audited financial statements and related notes as of and for the year ended December 31, 2016 included in the Company’s Annual Report on Form 10-K filed with the U.S. Securities and Exchange Commission. On January 11, 2016 (the “Petition Date”), Arch Coal and substantially all of its wholly owned domestic subsidiaries (the “Filing Subsidiaries” and, together with Arch Coal, the “Debtors”; the Debtors, solely following the effective date of the Plan, the “Reorganized Debtors”) filed voluntary petitions for reorganization (collectively, the “Bankruptcy Petitions”) under Chapter 11 of Title 11 of the U.S. Code (the “Bankruptcy Code”) in the United States Bankruptcy Court for the Eastern District of Missouri (the “Court”). The Debtors’ Chapter 11 Cases (collectively, the “Chapter 11 Cases”) were jointly administered under the caption In re Arch Coal, Inc., et al. Case No. 16-40120 (lead case). During the Chapter 11 Cases, each Debtor operated its business as a “debtor in possession” under the jurisdiction of the Court and in accordance with the applicable provisions of the Bankruptcy Code and the orders of the Court. Upon emergence from bankruptcy on October 5, 2016, Arch Coal applied the provisions of fresh start accounting effective October 1, 2016 which resulted in Arch becoming a new entity for financial reporting purposes. Accordingly, the consolidated financial statements and accompanying footnotes on or after October 1, 2016 are not comparable to the consolidated financial statements prior to that date. References to “Successor” in the consolidated financial statements and footnotes are in reference to reporting dates on or after October 2, 2016; references to “Predecessor” in the consolidated financial statements and footnotes are in reference to reporting dates through October 1, 2016 which includes the impact of the Plan provisions and the application of fresh start accounting.
Recent Adopted Accounting Guidance and Recent Accounting Guidance Issued Not Yet Effective	Recently Adopted Accounting Guidance In March 2016, the FASB issued Accounting Standards Update No. 2016-09, Compensation – Stock Compensation (Topic 718) ("ASU 2016-09"). ASU 2016-09 identifies areas for simplification involving several aspects of accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, an option to recognize gross stock compensation expense with actual forfeitures recognized as they occur, as well as certain classifications on the statement of cash flows. The Company adopted all provisions of this new accounting standard in the first quarter of 2017 and changed its forfeiture policy to recognizing the impact of forfeitures when they occur from estimating expected forfeitures in determining stock-based compensation expense. There was no material impact to the Company's financial statements. Recent Accounting Guidance Issued Not Yet Effective In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers.” ASU 2014-09 is a comprehensive revenue recognition standard that will supersede nearly all existing revenue recognition guidance under current U.S. GAAP and replace it with a principle based approach for determining revenue recognition. ASU 2014-09 will require that companies recognize revenue based on the value of transferred goods or services as they occur in the contract. The ASU also will require additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. ASU 2014-09 is effective for interim and annual periods beginning after December 15, 2017. Early adoption is permitted only in annual reporting periods beginning after December 15, 2016, including interim periods therein. Entities will be able to transition to the standard either retrospectively or as a cumulative-effect adjustment as of the date of adoption. The Company’s primary source of revenue is from the sale of coal through both short-term and long-term contracts with utilities, industrial customers and steel producers whereby revenue is currently recognized when risk of loss has passed to the customer. Upon adoption of this new standard, the Company believes that the timing of revenue recognition related to our coal sales will remain consistent with our current practice. The Company is currently evaluating other revenue streams to determine the potential impact related to the adoption of the standard, as well as potential disclosures required by the standard. The Company will be adopting the standard under the modified retrospective approach. In March 2017, the FASB issued ASU 2017-07, Compensation-Retirement Benefits (Topic 715) Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. ASU 2017-07 changes the income statement presentation of defined benefit plan expense by requiring separation between operating expense (service cost component) and non-operating expense (all other components, including interest cost, amortization of prior service cost, curtailments and settlements, etc.). The operating expense component is reported with similar compensation costs while the non-operating components are reported in Nonoperating expense. In addition, only the service cost component is eligible for capitalization as part of an asset such as inventory or property, plant and equipment. The Company is currently assessing the impact that adopting this new accounting standard will have on its consolidated financial statements.

Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2017

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

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



			Pension,
			Postretirement
			and Other					Accumulated
			Post-					Other
	Derivative		Employment		Available-for-			Comprehensive
	Instruments		Benefits		Sale Securities			Income
	(In thousands)
Balance at December 31, 2016	$	—	$	24,067	$	387		$	24,454
Unrealized gains (losses)	19		—		(55		)	(36		)
Amounts reclassified from AOCI	—		—		(332		)	(332		)
Balance at March 31, 2017	$	19	$	24,067	$	—		$	24,086

Schedule of Comprehensive Income Reclassifications

The following amounts were reclassified out of AOCI:



	Successor		Predecessor			Line Item in the Condensed Consolidated Statement of Operations
Details About AOCI Components	Three Months Ended March 31, 2017		Three Months Ended March 31, 2016
(In thousands)
Derivative instruments	$	—	$	226		Revenues
	—		(82		)	Provision for (benefit from) income taxes
	$	—	$	144		Net of tax

Pension, postretirement and other post-employment benefits
Amortization of prior service credits ⁽¹⁾	$	—	$	2,672
Amortization of actuarial gains (losses), net ⁽¹⁾	—		(1,334		)
	—		1,338
	—		(481		)	Provision for (benefit from) income taxes
	$	—	$	857		Net of tax

Available-for-sale securities	$	332	$	(2,895	)	Interest and investment income
	—		1,038			Provision for (benefit from) income taxes
	$	332	$	(1,857	)	Net of tax
¹ Production-related benefits and workers’ compensation costs are included in inventoriable production costs.

Inventories (Tables)

3 Months Ended

Mar. 31, 2017

Inventory Disclosure [Abstract]

Inventories

Inventories consist of the following:



	March 31,		December 31,
	2017		2016
	(In thousands)
Coal	$	49,066	$	37,268
Repair parts and supplies	76,128		76,194
	$	125,194	$	113,462

Investments in Available-for-Sale Securities (Tables)

3 Months Ended

Mar. 31, 2017

Available-for-sale Securities [Abstract]

Available-for-sale Securities

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



	March 31, 2017
										Balance Sheet
										Classification
			Gross Unrealized					Fair		Short-Term		Other
	Cost Basis		Gains		Losses			Value		Investments		Assets
	(In thousands)
Available-for-sale:
U.S. treasury securities	$	18,926	$	12	$	—		$	18,938	$	18,938	$	—
Corporate notes and bonds	103,639		21		(93		)	103,567		103,567		—
Total Investments	$	122,565	$	33	$	(93	)	$	122,505	$	122,505	$	—



	December 31, 2016
										Balance Sheet
										Classification
			Gross Unrealized					Fair		Short-Term		Other
	Cost Basis		Gains		Losses			Value		Investments		Assets
	(In thousands)
Available-for-sale:
Corporate notes and bonds	$	88,161	$	—	$	(89	)	$	88,072	$	88,072	$	—
Equity securities	1,749		388		—			2,137		—		2,137
Total Investments	$	89,910	$	388	$	(89	)	$	90,209	$	88,072	$	2,137

- 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

Sales Contracts (Tables)

3 Months Ended

Mar. 31, 2017

Acquired Sales Contracts [Abstract]

Schedule of Sales Contracts

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



	March 31, 2017								December 31, 2016
	Assets			Liabilities			Net Total		Assets			Liabilities			Net Total
	(In thousands)								(In thousands)
Original fair value	$	97,196		$	31,742				$	97,196		$	31,742
Accumulated amortization	(44,843		)	(29,356		)			(25,625		)	(24,829		)
Total	$	52,353		$	2,386		$	49,967	$	71,571		$	6,913		$	64,658
Balance Sheet classification:
Other current	$	43,238		$	817				$	59,702		$	5,114
Other noncurrent	$	9,115		$	1,569				$	11,869		$	1,799

Derivatives (Tables)

3 Months Ended

Mar. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Price Risk Derivatives

At March 31, 2017, the Company held derivatives for risk management purposes that are expected to settle in the following years:



(Tons in thousands)	2017	2018	Total
Coal sales	405	—	405
Coal purchases	360	—	360

Disclosure of Fair Value of Derivatives

The fair value and location of derivatives reflected in the accompanying Condensed Consolidated Balance Sheets are as follows:



	March 31, 2017								December 31, 2016
Fair Value of Derivatives	Asset			Liability					Asset			Liability
(In thousands)	Derivative			Derivative					Derivative			Derivative
Derivatives Designated as Hedging Instruments
Coal	$	9		$	—				$	—		$	(15	)

Derivatives Not Designated as Hedging Instruments
Heating oil -- diesel purchases	1,418			—					4,646			—
Coal -- held for trading purposes	43,157			(43,781		)			68,948			(68,740		)
Coal -- risk management	193			(271		)			475			(580		)
Natural gas	—			—					86			(13		)
Total	44,768			(44,052		)			74,155			(69,333		)
Total derivatives	44,777			(44,052		)			74,155			(69,348		)
Effect of counterparty netting	(43,359		)	43,359					(69,247		)	69,247
Net derivatives as classified in the balance sheets	$	1,418		$	(693	)	$	725	$	4,908		$	(101	)	$	4,807



		March 31, 2017			December 31, 2016
Net derivatives as reflected on the balance sheets (in thousands)
Heating oil and coal	Other current assets	$	1,418		$	4,908
Coal	Accrued expenses and other current liabilities	(693		)	(101		)
		$	725		$	4,807

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)

Three Months Ended March 31,



		Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion)						Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)
		Successor			Predecessor			Successor		Predecessor
		2017			2016			2017		2016
Coal sales	⁽¹⁾	$	220		$	13		$	—	$	1,369
Coal purchases	⁽²⁾	(201		)	(11		)	—		(1,143		)
Totals		$	19		$	2		$	—	$	226

Derivatives Not Designated as Hedging Instruments (in thousands)

Three Months Ended March 31,



		Gain (Loss) Recognized
		Successor			Predecessor
		2017			2016
Coal — unrealized	⁽³⁾	$	26		$	(1,115	)
Coal — realized	⁽⁴⁾	$	—		$	163
Natural gas — unrealized	⁽³⁾	$	(469	)	$	(469	)
Heating oil — diesel purchases	⁽⁴⁾	$	(3,578	)	$	(443	)
Foreign currency	⁽⁴⁾	$	—		$	(171	)

____________________________________________________________

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) expense, net

Accrued Expenses and Other Current Liabilities (Tables)

3 Months Ended

Mar. 31, 2017

Payables and Accruals [Abstract]

Schedule of Accrued Liabilities

Accrued expenses and other current liabilities consist of the following:



	March 31,		December 31,
	2017		2016
	(In thousands)
Payroll and employee benefits	$	41,663	$	58,468
Taxes other than income taxes	88,418		92,733
Interest	202		8,032
Acquired sales contracts	817		5,114
Workers’ compensation	16,046		15,184
Asset retirement obligations	19,340		19,515
Other	6,412		6,194
	$	172,898	$	205,240

Debt and Financing Arrangements (Tables)

3 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

Debt



	March 31,			December 31,
	2017			2016
	(In thousands)
Term loan due 2024 ($300.0 million face value)	298,512			—
Term loan due 2021 ($325.7 million face value)	—			325,684
Other	34,424			37,195
Debt issuance costs	(7,008		)	—
	325,928			362,879
Less: current maturities of debt	7,898			11,038
Long-term debt	$	318,030		$	351,841

Income Taxes (Tables)

3 Months Ended

Mar. 31, 2017

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

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



	Successor			Predecessor
	Three Months Ended March 31, 2017			Three Months Ended March 31, 2016
(In thousands)
Income tax provision (benefit) at statutory rate	$	18,378		$	(72,735	)
Percentage depletion allowance	(7,039		)	(25,667		)
State taxes, net of effect of federal taxes	483			(4,490		)
Change in valuation allowance	(11,902		)	100,562
Other, net	920			1,219
	$	840		$	(1,111	)

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2017

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 condensed consolidated balance sheet:



	March 31, 2017
	Total		Level 1		Level 2		Level 3
	(In thousands)
Assets:
Investments in marketable securities	$	122,505	$	18,938	$	103,567	$	—
Derivatives	1,418		—		—		1,418
Total assets	$	123,923	$	18,938	$	103,567	$	1,418
Liabilities:
Derivatives	$	693	$	644	$	—	$	49

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.



	Three Months Ended March 31, 2017
	(In thousands)
Balance, beginning of period	$	4,537
Realized and unrealized gains recognized in earnings, net	(4,068		)
Purchases	1,395
Issuances	(182		)
Settlements	(313		)
Ending balance	$	1,369

Earnings (loss) per common share (Tables)

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Schedule of Weighted Average Number of Shares

The following table provides the basis for basic and diluted earnings (loss) per share by reconciling the numerators and denominators of the computations:



	Successor	Predecessor
	March 31, 2017	March 31, 2016
(In Thousands)
Weighted average shares outstanding:
Basic weighted average shares outstanding	25,008	21,293
Effect of dilutive securities	400	—

Diluted weighted average shares outstanding	25,408	21,293

Workers' Compensation Expense (Tables)

3 Months Ended

Mar. 31, 2017

Workers' compensation expense

Workers’ compensation expense consists of the following components:



	Successor		Predecessor
	Three Months Ended March 31, 2017		Three Months Ended March 31, 2016
(In thousands)
Self-insured occupational disease benefits:
Service cost	$	1,558	$	1,105
Interest cost	1,169		1,057
Net amortization	—		1,141
Total occupational disease	$	2,727	$	3,303
Traumatic injury claims and assessments	2,878		2,967
Total workers’ compensation expense	$	5,605	$	6,270

Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2017

Pension and Other Postretirement Benefit Expense [Abstract]

Pension Benefit Costs

The following table details the components of pension benefit costs:



	Successor			Predecessor
	Three Months Ended March 31, 2017			Three Months Ended March 31, 2016
(In thousands)
Interest cost	2,991			3,338
Expected return on plan assets	(4,497		)	(4,538		)
Amortization of other actuarial losses	—			757
Net benefit credit	$	(1,506	)	$	(443	)

The following table details the components of other postretirement benefit costs (credits):



	Successor		Predecessor
	Three Months Ended March 31, 2017		Three Months Ended March 31, 2016
(In thousands)
Service cost	$	170	$	160
Interest cost	1,058		1,134
Amortization of prior service credits	—		(2,673		)
Amortization of other actuarial losses (gains)	—		(566		)
Net benefit cost (credit)	$	1,228	$	(1,945	)

Segment Information (Tables)

3 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

Schedule of Operating Segment Results

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.



	PRB		MET		Other Thermal		Corporate, Other and Eliminations			Consolidated
Successor Period	(in thousands)
Three Months Ended March 31, 2017
Revenues	$	273,428	$	225,582	$	101,906	$	59		$	600,975
Adjusted EBITDAR	48,006		68,310		27,242		(23,060		)	120,498
Depreciation, depletion and amortization	9,510		18,764		3,200		447			31,921
Accretion on asset retirement obligation	5,040		528		540		1,515			7,623
Capital expenditures	128		4,610		741		471			5,950

Predecessor Period
Three Months Ended March 31, 2016
Revenues	$	223,122	$	136,583	$	56,132	$	12,269		$	428,106
Adjusted EBITDAR	12,728		6,352		3,151		(23,951		)	(1,720		)
Depreciation, depletion and amortization	32,760		19,345		9,891		1,703			63,699
Accretion on asset retirement obligation	5,647		588		663		1,408			8,306
Capital expenditures	10		3,604		1,945		367			5,926

Reconciliation Statement of Segment Income from Operations to Consolidated Income Before Income Taxes

A reconciliation of adjusted EBITDAR to consolidated loss before income taxes follows:



	Successor			Predecessor
	Three Months Ended March 31,			Three Months Ended March 31,
	2017			2016
(In thousands)
Adjusted EBITDAR	$	120,498		$	(1,720	)
Depreciation, depletion and amortization	(31,921		)	(63,699		)
Accretion on asset retirement obligations	(7,623		)	(8,306		)
Amortization of sales contracts, net	(14,690		)	833
Asset impairment and mine closure costs	—			(85,520		)
Interest expense, net	(8,898		)	(43,313		)
Net loss resulting from early retirement of debt and debt restructuring	(2,030		)	(2,213		)
Reorganization items, net	(2,828		)	(3,875		)
Income (loss) before income taxes	$	52,508		$	(207,813	)

Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Derivative Instruments [Member]
Accumulated Other Comprenhensive Income (Loss) [Roll Forward]
Beginning Balance	$ 0
Unrealized gains (losses)	19
Amounts reclassified from AOCI	0
Ending Balance	19
Pension, Postretirement and Other Postemployment Benefits [Member]
Accumulated Other Comprenhensive Income (Loss) [Roll Forward]
Beginning Balance	24,067
Unrealized gains (losses)	0
Amounts reclassified from AOCI	0
Ending Balance	24,067
Available-for-Sale Securities [Member]
Accumulated Other Comprenhensive Income (Loss) [Roll Forward]
Beginning Balance	387
Unrealized gains (losses)	(55)
Amounts reclassified from AOCI	(332)
Ending Balance	0
Accumulated Other Comprehensive Income[Member]
Accumulated Other Comprenhensive Income (Loss) [Roll Forward]
Beginning Balance	24,454
Unrealized gains (losses)	(36)
Amounts reclassified from AOCI	(332)
Ending Balance	$ 24,086

Accumulated Other Comprehensive Income (Schedule of Reclassifications) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net of tax	$ 0
Pension, Postretirement and Other Postemployment Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net of tax	0
Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net of tax	332
Predecessor [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Revenues		$ 428,106
Provision for (benefit from) income taxes		1,111
Net income (loss)		(206,702)
Predecessor [Member] \| Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI before tax		2,672
Predecessor [Member] \| Pension, Postretirement and Other Postemployment Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI before tax		1,338
Provision for (benefit from) income taxes		(481)
Net of tax		857
Predecessor [Member] \| Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI before tax		1,334
Predecessor [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member] \| Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Revenues		226
Provision for (benefit from) income taxes		(82)
Net income (loss)		144
Predecessor [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member] \| Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest and investment income		(2,895)
Provision for (benefit from) income taxes		1,038
Net income (loss)		$ (1,857)
Successor [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Revenues	600,975
Provision for (benefit from) income taxes	(840)
Net income (loss)	51,668
Successor [Member] \| Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI before tax	0
Successor [Member] \| Pension, Postretirement and Other Postemployment Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI before tax	0
Provision for (benefit from) income taxes	0
Net of tax	0
Successor [Member] \| Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI before tax	0
Successor [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member] \| Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Revenues	0
Provision for (benefit from) income taxes	0
Net income (loss)	0
Successor [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member] \| Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest and investment income	332
Provision for (benefit from) income taxes	0
Net income (loss)	$ 332

Reorganization items, net (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Successor [Member]
Fresh-Start Adjustment [Line Items]
Reorganization items, net	$ (2,828)
Professional fee expense	2,800
Payments for reorganization items	$ 3,700
Predecessor [Member]
Fresh-Start Adjustment [Line Items]
Reorganization items, net		$ (3,875)
Professional fee expense		17,800
Non-cash gains on rejected contracts		(13,900)
Payments for reorganization items		$ 1,500

Asset Impairments and Mine Closure Costs (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Asset impairment and mine closure costs	$ 85.5
Impairment charge on investment	2.9
Kentucky [Member]
Restructuring Cost and Reserve [Line Items]
Impaired coal reserves and surface land	74.1
Severance expense	5.1
Royalty Agreements [Member]
Restructuring Cost and Reserve [Line Items]
Impairment charge	$ 3.4

Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Coal	$ 49,066	$ 37,268
Repair parts and supplies	76,128	76,194
Inventories	125,194	113,462
Allowance for slow-moving and obsolete inventories	$ (100)	$ 0

Investments in Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Current	$ 122,505	$ 88,072
Total Investments, Cost Basis	122,565	89,910
Total Investments, Accumulated Gross Unrealized Gains	33	388
Total Investments, Accumulated Gross Unrealized Losses	(93)	(89)
Total Investments	122,505	90,209
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Investments, Current	122,505	88,072
Other Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Total Investments, Noncurrent	0	2,137
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Cost Basis	18,926
Debt Securities, Accumulated Gross Unrealized Gains	12
Debt Securities, Accumulated Gross Unrealized Losses	0
Debt Securities	18,938
U.S. Treasury Securities [Member] \| Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Current	18,938
U.S. Treasury Securities [Member] \| Other Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Noncurrent	0
Corporate Notes and Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Cost Basis	103,639	88,161
Debt Securities, Accumulated Gross Unrealized Gains	21	0
Debt Securities, Accumulated Gross Unrealized Losses	(93)	(89)
Debt Securities	103,567	88,072
Corporate Notes and Bonds [Member] \| Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Current	103,567	88,072
Corporate Notes and Bonds [Member] \| Other Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Noncurrent	$ 0	0
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Equity Securities, Cost Basis		1,749
Equity Securities, Accumulated Gross Unrealized Gains		388
Equity Securities, Accumulated Gross Unrealized Losses		0
Equity securities		2,137
Equity Securities [Member] \| Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Equity Securities, Current		0
Equity Securities [Member] \| Other Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Equity Securities, Noncurrent		$ 2,137

Investments in Available-for-Sale Securities (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Available-for-sale Securities [Abstract]
Unrealized losses owned for less than 12 months	$ 59.4	$ 47.6
Unrealized losses owned for greater than 12 months	$ 16.0	$ 40.4

Sales Contracts (Schedule of Sales Contracts) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets And Liabilities By Major Class [Line Items]
Acquired fair value, Assets	$ 97,196	$ 97,196
Acquired fair value, Liabilities	31,742	31,742
Accumulated amortization, Asset	(44,843)	(25,625)
Accumulated amortization, Liabilities	(29,356)	(24,829)
Total, Assets	52,353	71,571
Total, Liabilities	2,386	6,913
Net total, Liabilities	49,967	64,658
Coal Supply Agreement, Liabilities	817	5,114
Other Current Assets [Member]
Acquired Finite-Lived Intangible Assets And Liabilities By Major Class [Line Items]
Coal supply agreement, Assets	43,238	59,702
Other Current Liabilities [Member]
Acquired Finite-Lived Intangible Assets And Liabilities By Major Class [Line Items]
Coal Supply Agreement, Liabilities	817	5,114
Other Noncurrent Assets [Member]
Acquired Finite-Lived Intangible Assets And Liabilities By Major Class [Line Items]
Coal supply agreement, Assets	9,115	11,869
Other Noncurrent Liabilities [Member]
Acquired Finite-Lived Intangible Assets And Liabilities By Major Class [Line Items]
Coal Supply Agreement, Liabilities	$ 1,569	$ 1,799

Sales Contracts (Narrative) (Details) $ in Millions	Mar. 31, 2017 USD ($)
Acquired Sales Contracts [Abstract]
2017	$ 57.3
2018	11.5
2019	(0.6)
2020	(0.1)
2021	$ (0.1)

Derivatives (Narrative) (Details) gal in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($) gal $ / option	Mar. 31, 2016 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 $ / option	Dec. 31, 2016 USD ($)
Derivative [Line Items]
Current liability for the obligation to return cash collateral \| $	$ 4.8				$ 2.8
Net unrealized and realized gains (losses) related to trading portfolio \| $	$ (0.7)	$ 0.1
Scenario, Forecast [Member]
Derivative [Line Items]
Value of trading portfolio realized \| $			$ (0.6)
Not Designated as Hedging Instrument [Member] \| Heating Oil [Member]
Derivative [Line Items]
Percent of expected requirements covered	75.00%
Derivative, average price risk option strike price (in usd per gallon) \| $ / option	1.77
Not Designated as Hedging Instrument [Member] \| Diesel Purchases [Member] \| Scenario, Forecast [Member]
Derivative [Line Items]
Percent of expected requirements covered				12.00%
Derivative, average price risk option strike price (in usd per gallon) \| $ / option				1.92
Not Designated as Hedging Instrument [Member] \| Diesel Purchases [Member] \| Heating Oil [Member]
Derivative [Line Items]
Quantities under derivative contracts (in gallons) \| gal	30
Not Designated as Hedging Instrument [Member] \| Diesel Purchases [Member] \| Minimum [Member]
Derivative [Line Items]
Gallons of diesel fuel purchased annually \| gal	38
Not Designated as Hedging Instrument [Member] \| Diesel Purchases [Member] \| Maximum [Member]
Derivative [Line Items]
Gallons of diesel fuel purchased annually \| gal	44

Derivatives (Schedule of Price Risk Derivatives) (Details) T in Thousands	Mar. 31, 2017 T
Coal sales [Member]
Derivative [Line Items]
Derivatives Held	405
Coal purchases [Member]
Derivative [Line Items]
Derivatives Held	360
2017 [Member] \| Coal sales [Member]
Derivative [Line Items]
Derivatives Held	405
2017 [Member] \| Coal purchases [Member]
Derivative [Line Items]
Derivatives Held	360
2018 [Member] \| Coal sales [Member]
Derivative [Line Items]
Derivatives Held	0
2018 [Member] \| Coal purchases [Member]
Derivative [Line Items]
Derivatives Held	0

Derivatives (Disclosure Of Fair Value Of Derivatives) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative Assets	$ 44,777	$ 74,155
Derivative Liabilities	(44,052)	(69,348)
Effect of counterparty netting in derivative assets	(43,359)	(69,247)
Effect of counterparty netting in derivative liabilities	43,359	69,247
Derivative Asset	1,418	4,908
Derivative Liability	(693)	(101)
Net derivatives as classified in the balance sheet	725	4,807
Designated as Hedging Instrument [Member] \| Coal Contract [Member]
Derivative [Line Items]
Derivative Assets	9	0
Derivative Liabilities	0	(15)
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets	44,768	74,155
Derivative Liabilities	(44,052)	(69,333)
Not Designated as Hedging Instrument [Member] \| Coal Contract [Member]
Derivative [Line Items]
Derivative Assets	43,157	68,948
Derivative Liabilities	(43,781)	(68,740)
Not Designated as Hedging Instrument [Member] \| Coal Contract [Member]
Derivative [Line Items]
Derivative Assets	193	475
Derivative Liabilities	(271)	(580)
Not Designated as Hedging Instrument [Member] \| Heating Oil-Diesel Purchases [Member]
Derivative [Line Items]
Derivative Assets	1,418	4,646
Derivative Liabilities	0	0
Not Designated as Hedging Instrument [Member] \| Natural Gas [Member]
Derivative [Line Items]
Derivative Assets	0	86
Derivative Liabilities	$ 0	$ (13)

Derivatives (Net Derivatives As Reflected On The Balance Sheets) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Net derivatives as classified in the balance sheet	$ 725	$ 4,807
Accrued expenses and other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Net derivatives as classified in the balance sheet	(693)	(101)
Heating Oil and Foreign Currency [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Net derivatives as classified in the balance sheet	$ 1,418	$ 4,908

Derivatives (Effects Of Derivatives On Measures Of Financial Performance) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Successor [Member] \| Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion)	$ 19
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)	0
Successor [Member] \| Designated as Hedging Instrument [Member] \| Coal sales [Member] \| Coal Contract [Member] \| Sales Revenue, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion)	220
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)	0
Successor [Member] \| Designated as Hedging Instrument [Member] \| Coal purchases [Member] \| Coal Contract [Member] \| Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion)	(201)
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)	0
Successor [Member] \| Not Designated as Hedging Instrument [Member] \| Coal Contract [Member] \| Change in Fair Value of Coal Derivatives and Coal Trading Activity, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives	26
Successor [Member] \| Not Designated as Hedging Instrument [Member] \| Coal Contract [Member] \| Other Operating Income (Expense) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives	0
Successor [Member] \| Not Designated as Hedging Instrument [Member] \| Natural Gas [Member] \| Change in Fair Value of Coal Derivatives and Coal Trading Activity, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives	(469)
Successor [Member] \| Not Designated as Hedging Instrument [Member] \| Heating Oil-Diesel Purchases [Member] \| Other Operating Income (Expense) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Heating oil realized and unrealized gains and losses	(3,578)
Successor [Member] \| Not Designated as Hedging Instrument [Member] \| Foreign Currency [Member] \| Other Operating Income (Expense) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Heating oil realized and unrealized gains and losses	$ 0
Predecessor [Member] \| Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion)		$ 2
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)		226
Predecessor [Member] \| Designated as Hedging Instrument [Member] \| Coal sales [Member] \| Coal Contract [Member] \| Sales Revenue, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion)		13
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)		1,369
Predecessor [Member] \| Designated as Hedging Instrument [Member] \| Coal purchases [Member] \| Coal Contract [Member] \| Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income(Effective Portion)		(11)
Gains (Losses) Reclassified from Other Comprehensive Income into Income (Effective Portion)		(1,143)
Predecessor [Member] \| Not Designated as Hedging Instrument [Member] \| Coal Contract [Member] \| Change in Fair Value of Coal Derivatives and Coal Trading Activity, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives		(1,115)
Predecessor [Member] \| Not Designated as Hedging Instrument [Member] \| Coal Contract [Member] \| Other Operating Income (Expense) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives		163
Predecessor [Member] \| Not Designated as Hedging Instrument [Member] \| Natural Gas [Member] \| Change in Fair Value of Coal Derivatives and Coal Trading Activity, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives		(469)
Predecessor [Member] \| Not Designated as Hedging Instrument [Member] \| Heating Oil-Diesel Purchases [Member] \| Other Operating Income (Expense) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Heating oil realized and unrealized gains and losses		(443)
Predecessor [Member] \| Not Designated as Hedging Instrument [Member] \| Foreign Currency [Member] \| Other Operating Income (Expense) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Heating oil realized and unrealized gains and losses		$ (171)

Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Payroll and employee benefits	$ 41,663	$ 58,468
Taxes other than income taxes	88,418	92,733
Interest	202	8,032
Acquired sales contracts	817	5,114
Workers’ compensation	16,046	15,184
Asset retirement obligations	19,340	19,515
Other	6,412	6,194
Accrued expenses and other current liabilities	$ 172,898	$ 205,240

Debt and Financing Arrangements (Long term Debt) (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Other	$ 34,424,000	$ 37,195,000
Debt issuance costs	(7,008,000)	0
Total	325,928,000	362,879,000
Less: current maturities of debt	7,898,000	11,038,000
Long-term debt	318,030,000	351,841,000
Term loan [Member] \| Term Loan Due 2024 [Member]
Debt Instrument [Line Items]
Term loan	298,512,000	0
Debt instrument, face amount	300,000,000.0
Term loan [Member] \| Term Loan Due 2021 [Member]
Debt Instrument [Line Items]
Term loan	$ 0	325,684,000
Debt instrument, face amount		$ 325,700,000.0

Debt and Financing Arrangements (Narrative) (Details) - USD ($)		3 Months Ended
	Mar. 07, 2017	Mar. 31, 2017	Mar. 31, 2016
Line of Credit Facility [Line Items]
Debt financing costs		$ 2,000,000	$ 2,200,000
New Term Loan Debt Facility [Member] \| Senior Notes [Member]
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 300,000,000
Percentage of face amount	99.50%
Quarterly amortization payments	$ 750,000
Amount of voting equity interests of domestic subsidiaries guaranteed (percent)	100.00%
Amount of voting equity interests of foreign owned subsidiaries guaranteed (percent)	65.00%
Net cash proceeds of from debt issuances and other non-ordinary sales or dispositions (percent)	100.00%
Default to indebtedness	$ 50,000,000
Default to surety, reclamation or similar bond	50,000,000
Default to uninsured judgment	50,000,000
Uninsured losses or proceedings against	$ 50,000,000
New Term Loan Debt Facility [Member] \| Senior Notes [Member] \| LIBOR [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)	4.00%
New Term Loan Debt Facility [Member] \| Senior Notes [Member] \| Base Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)	3.00%
Previous First Lien Debt Facility [Member] \| Senior Notes [Member]
Line of Credit Facility [Line Items]
Debt financing costs		1,000,000
Minimum [Member] \| New Term Loan Debt Facility [Member] \| Senior Notes [Member] \| LIBOR [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)	1.00%
Successor [Member]
Line of Credit Facility [Line Items]
Financing costs		2,030,000
Debt financing costs		7,228,000
Interest expense		(9,425,000)
Successor [Member] \| New Term Loan Debt Facility [Member] \| Senior Notes [Member]
Line of Credit Facility [Line Items]
Financing costs		$ 7,200,000
Predecessor [Member]
Line of Credit Facility [Line Items]
Financing costs			2,213,000
Debt financing costs			18,403,000
Interest expense			(44,451,000)
Predecessor [Member] \| Superpriority Debtor-in Possession Credit Agreement [Member] \| Line of Credit [Member]
Line of Credit Facility [Line Items]
Financing costs			$ 18,400,000

Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Successor [Member]
Income Tax Examination [Line Items]
Income tax provision (benefit) at statutory rate	$ 18,378
Percentage depletion allowance	(7,039)
State taxes, net of effect of federal taxes	483
Change in valuation allowance	(11,902)
Other, net	920
Income Tax Expense (Benefit)	$ 840
Predecessor [Member]
Income Tax Examination [Line Items]
Income tax provision (benefit) at statutory rate		$ (72,735)
Percentage depletion allowance		(25,667)
State taxes, net of effect of federal taxes		(4,490)
Change in valuation allowance		100,562
Other, net		1,219
Income Tax Expense (Benefit)		$ (1,111)

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
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	$ 334.4	$ 362.9
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized gains (losses) related to level 3 financial instruments	$ (2.8)

Fair Value Measurements (Summary Of Financial Assets And Liabilities Accounted For At Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets:
Investments in marketable securities	$ 122,505	$ 90,209
Derivatives	1,418	4,908
Total assets	123,923
Liabilities:
Derivatives	693	$ 101
Level 1 [Member]
Assets:
Investments in marketable securities	18,938
Derivatives	0
Total assets	18,938
Liabilities:
Derivatives	644
Level 2 [Member]
Assets:
Investments in marketable securities	103,567
Total assets	103,567
Liabilities:
Derivatives	0
Level 3 [Member]
Assets:
Investments in marketable securities	0
Derivatives	1,418
Total assets	1,418
Liabilities:
Derivatives	$ 49

Fair Value Measurements (Summary Of Change In The Fair Values Of Financial Instruments Categorized As Level 3) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 4,537
Realized and unrealized gains recognized in earnings, net	(4,068)
Purchases	1,395
Issuances	(182)
Settlements	(313)
Ending balance	$ 1,369

Earnings (loss) per common share (Weighted-Average Number of Shares) (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Successor [Member]
Weighted average shares outstanding:
Basic weighted average shares outstanding	25,008
Effect of dilutive securities	400
Diluted weighted average shares outstanding	25,408
Predecessor [Member]
Weighted average shares outstanding:
Basic weighted average shares outstanding		21,293
Effect of dilutive securities		0
Diluted weighted average shares outstanding		21,293

Workers' Compensation Expense (Worker's Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Successor [Member] \| Workers' Compensation [Member]
Accrued Workers' Compensation [Line Items]
Total workers’ compensation expense	$ 5,605
Successor [Member] \| Occupational Disease [Member]
Accrued Workers' Compensation [Line Items]
Service cost	1,558
Interest cost	1,169
Net amortization	0
Total occupational disease	2,727
Successor [Member] \| Traumatic Injury Claims and Assessments [Member]
Accrued Workers' Compensation [Line Items]
Traumatic injury claims and assessments	$ 2,878
Predecessor [Member] \| Workers' Compensation [Member]
Accrued Workers' Compensation [Line Items]
Total workers’ compensation expense		$ 6,270
Predecessor [Member] \| Occupational Disease [Member]
Accrued Workers' Compensation [Line Items]
Service cost		1,105
Interest cost		1,057
Net amortization		1,141
Total occupational disease		3,303
Predecessor [Member] \| Traumatic Injury Claims and Assessments [Member]
Accrued Workers' Compensation [Line Items]
Traumatic injury claims and assessments		$ 2,967

Employee Benefit Plans (Pension And Other Postretirement Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Successor [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 2,991
Expected return on plan assets	(4,497)
Amortization of other actuarial losses (gains)	0
Net benefit cost (credit)	(1,506)
Successor [Member] \| Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	170
Interest cost	1,058
Amortization of prior service credits	0
Amortization of other actuarial losses (gains)	0
Net benefit cost (credit)	$ 1,228
Predecessor [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost		$ 3,338
Expected return on plan assets		(4,538)
Amortization of other actuarial losses (gains)		757
Net benefit cost (credit)		(443)
Predecessor [Member] \| Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		160
Interest cost		1,134
Amortization of prior service credits		(2,673)
Amortization of other actuarial losses (gains)		(566)
Net benefit cost (credit)		$ (1,945)

Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Amount accrued	$ 1.3	$ 2.2

Segment Information (Schedule Of Operating Segment Results) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Segment	Mar. 31, 2016 USD ($)
Segment Reporting [Abstract]
Number of reportable segments \| Segment	2
Successor [Member]
Segment Reporting Information [Line Items]
Revenues	$ 600,975
Adjusted EBITDAR	120,498
Depreciation, depletion and amortization	31,921
Accretion on asset retirement obligations	7,623
Capital expenditures	5,950
Successor [Member] \| Operating Segments [Member] \| PRB [Member]
Segment Reporting Information [Line Items]
Revenues	273,428
Adjusted EBITDAR	48,006
Depreciation, depletion and amortization	9,510
Accretion on asset retirement obligations	5,040
Capital expenditures	128
Successor [Member] \| Operating Segments [Member] \| MET [Member]
Segment Reporting Information [Line Items]
Revenues	225,582
Adjusted EBITDAR	68,310
Depreciation, depletion and amortization	18,764
Accretion on asset retirement obligations	528
Capital expenditures	4,610
Successor [Member] \| Operating Segments [Member] \| Other Thermal [Member]
Segment Reporting Information [Line Items]
Revenues	101,906
Adjusted EBITDAR	27,242
Depreciation, depletion and amortization	3,200
Accretion on asset retirement obligations	540
Capital expenditures	741
Successor [Member] \| Corporate, Other and Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	59
Adjusted EBITDAR	(23,060)
Depreciation, depletion and amortization	447
Accretion on asset retirement obligations	1,515
Capital expenditures	$ 471
Predecessor [Member]
Segment Reporting Information [Line Items]
Revenues		$ 428,106
Adjusted EBITDAR		(1,720)
Depreciation, depletion and amortization		63,699
Accretion on asset retirement obligations		8,306
Capital expenditures		5,926
Predecessor [Member] \| Operating Segments [Member] \| PRB [Member]
Segment Reporting Information [Line Items]
Revenues		223,122
Adjusted EBITDAR		12,728
Depreciation, depletion and amortization		32,760
Accretion on asset retirement obligations		5,647
Capital expenditures		10
Predecessor [Member] \| Operating Segments [Member] \| MET [Member]
Segment Reporting Information [Line Items]
Revenues		136,583
Adjusted EBITDAR		6,352
Depreciation, depletion and amortization		19,345
Accretion on asset retirement obligations		588
Capital expenditures		3,604
Predecessor [Member] \| Operating Segments [Member] \| Other Thermal [Member]
Segment Reporting Information [Line Items]
Revenues		56,132
Adjusted EBITDAR		3,151
Depreciation, depletion and amortization		9,891
Accretion on asset retirement obligations		663
Capital expenditures		1,945
Predecessor [Member] \| Corporate, Other and Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues		12,269
Adjusted EBITDAR		(23,951)
Depreciation, depletion and amortization		1,703
Accretion on asset retirement obligations		1,408
Capital expenditures		$ 367

Segment Information (Reconciliation Statement Of Segment Income from Operations To Consolidated Income Before Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Asset impairment and mine closure costs		$ (85,500)
Successor [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDAR	$ 120,498
Depreciation, depletion and amortization	(31,921)
Accretion on asset retirement obligations	(7,623)
Amortization of sales contracts, net	(14,690)
Asset impairment and mine closure costs	0
Interest expense, net	(8,898)
Net loss resulting from early retirement of debt and debt restructuring	(2,030)
Reorganization items, net	(2,828)
Income (loss) before income taxes	$ 52,508
Predecessor [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDAR		(1,720)
Depreciation, depletion and amortization		(63,699)
Accretion on asset retirement obligations		(8,306)
Amortization of sales contracts, net		833
Asset impairment and mine closure costs		(85,520)
Interest expense, net		(43,313)
Net loss resulting from early retirement of debt and debt restructuring		(2,213)
Reorganization items, net		(3,875)
Income (loss) before income taxes		$ (207,813)

Subsequent Events (Narrative) (Details) - USD ($)	Apr. 27, 2017	Mar. 31, 2017
Subsequent Event [Line Items]
Borrowing capacity of securitization agreement		$ 200,000,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Borrowing capacity of securitization agreement	$ 160,000,000
Term of securitization agreement	3 years
Amount of liquidity covenant	$ 175,000,000
Liquidity covenant term	60 days
Authorized amount of repurchase program	$ 300,000,000
Common shares outstanding	25,021,079
Cash dividend declared (in usd per share)	$ 0.35
Regions [Member] \| Subsequent Event [Member] \| Secured Debt [Member]
Subsequent Event [Line Items]
Percentage of liquidation value of coal inventory	85.00%
Percentage of liquidation value of parts and supplies inventory	85.00%
Percentage of clause	35.00%
Percentage of eligible cash	100.00%
Liquidity covenant terms	60 days
Regions [Member] \| Subsequent Event [Member] \| Secured Debt [Member] \| Maximum [Member]
Subsequent Event [Line Items]
Amount of liquidity covenant, minimum	$ 250,000,000
Regions [Member] \| Subsequent Event [Member] \| Secured Debt [Member] \| Minimum [Member]
Subsequent Event [Line Items]
Amount of liquidity covenant, minimum	$ 175,000,000
Regions [Member] \| Subsequent Event [Member] \| Secured Debt [Member] \| LIBOR [Member] \| Maximum [Member]
Subsequent Event [Line Items]
Basis spread on variable rate (percent)	2.50%
Regions [Member] \| Subsequent Event [Member] \| Secured Debt [Member] \| LIBOR [Member] \| Minimum [Member]
Subsequent Event [Line Items]
Basis spread on variable rate (percent)	2.25%
Regions [Member] \| Subsequent Event [Member] \| Secured Debt [Member] \| Base Rate [Member] \| Maximum [Member]
Subsequent Event [Line Items]
Basis spread on variable rate (percent)	1.50%
Regions [Member] \| Subsequent Event [Member] \| Secured Debt [Member] \| Base Rate [Member] \| Minimum [Member]
Subsequent Event [Line Items]
Basis spread on variable rate (percent)	1.25%
Revolving Credit Facility [Member] \| Subsequent Event [Member] \| Secured Debt [Member]
Subsequent Event [Line Items]
Aggregate principal amount	$ 40,000,000