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Document And Entity Information - shares	3 Months Ended
Document And Entity Information - shares	Mar. 31, 2012	May 09, 2012
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, 2012
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		212,247,652

Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidated Statements Of Income [Abstract]
Revenues	$ 1,039,651	$ 872,938
Costs, expenses and other
Cost of sales	850,871	653,684
Depreciation, depletion and amortization	139,966	83,537
Amortization of acquired sales contracts, net	(14,017)	5,944
Selling, general and administrative expenses	30,861	30,435
Change in fair value of coal derivatives and coal trading activities, net	(3,613)	(1,784)
Other operating income, net	(18,498)	(1,116)
Total operating expenses	985,570	770,700
Income from operations	54,081	102,238
Interest expense, net:
Interest expense	(74,772)	(34,580)
Interest income	1,021	746
Interest expense, net	(73,751)	(33,834)
Income before income taxes	(19,670)	68,404
Provision for (benefit from) income taxes	(21,079)	12,530
Net income	1,409	55,874
Less: Net income attributable to noncontrolling interest	(203)	(273)
Net income attributable to Arch Coal, Inc.	$ 1,206	$ 55,601
Earnings per common share
Basic earnings per common share	$ 0.01	$ 0.34
Diluted earnings per common share	$ 0.01	$ 0.34
Basic, weighted average shares outstanding	211,687	162,576
Diluted, weighted average shares outstanding	211,908	163,773
Dividends declared per common share	$ 0.11	$ 0.10

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 1,409	$ 55,874
Other comprehensive income, net of income taxes:
Pension, postretirement and other post-employment benefits, reclassifications into net income	463	573
Unrealized gains (losses) on available-for-sale securities	252	747
Unrealized gains and losses on derivatives, net of reclassifications into net income:
Unrealized gains (losses) on derivatives	1,760	9,501
Reclassifications of (gains) losses into net income	4,825	(2,124)
Total other comprehensive income	7,300	8,697
Total comprehensive income	$ 8,709	$ 64,571

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 117,770	$ 138,149
Restricted cash	8,866	10,322
Trade accounts receivable	295,012	380,595
Other receivables	66,702	88,584
Inventories	488,686	377,490
Prepaid royalties	18,025	21,944
Deferred income taxes	65,531	42,051
Coal derivative assets	22,043	13,335
Other	96,484	110,304
Total current assets	1,179,119	1,182,774
Property, plant and equipment, net	7,892,733	7,949,150
Other assets
Prepaid royalties	90,221	86,626
Goodwill	596,103	596,103
Equity investments	230,519	225,605
Other	176,423	173,701
Total other assets	1,093,266	1,082,035
Total assets	10,165,118	10,213,959
Current liabilities
Accounts payable	294,341	383,782
Coal derivative liabilities	9,100	7,828
Accrued expenses and other current liabilities	357,386	348,207
Current maturities of debt and short-term borrowings	102,356	280,851
Total current liabilities	763,183	1,020,668
Long-term debt	3,967,796	3,762,297
Asset retirement obligations	432,620	446,784
Accrued pension benefits	49,378	48,244
Accrued postretirement benefits other than pension	42,784	42,309
Accrued workers' compensation	74,012	71,948
Deferred income taxes	982,596	976,753
Other noncurrent liabilities	268,585	255,382
Total liabilities	6,580,954	6,624,385
Redeemable noncontrolling interest	11,739	11,534
Stockholders' Equity
Common stock	2,141	2,136
Paid-in capital	3,024,553	3,015,349
Treasury stock, at cost	(53,848)	(53,848)
Retained earnings	600,230	622,353
Accumulated other comprehensive loss	(651)	(7,950)
Total stockholders' equity	3,572,425	3,578,040
Total liabilities and stockholders' equity	$ 10,165,118	$ 10,213,959

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating activties
Net income	$ 1,409	$ 55,874
Adjustments to reconcile to cash provided by operating activities:
Depreciation, depletion and amortization	139,966	83,537
Amortization of acquired sales contracts, net	(14,017)	5,944
Prepaid royalties expensed	8,586	8,916
Employee stock-based compensation expense	4,079	5,290
Amortization relating to financing activities	4,288	2,442
Changes in:
Receivables	88,082	(53,586)
Inventories	(111,196)	(12,292)
Coal derivative assets and liabilities	(5,347)	(1,087)
Accounts payable, accrued expenses and other current liabilities	(66,222)	(38,054)
Income taxes, net	23,002	12,558
Deferred income taxes	(21,742)	(1,026)
Other	4,102	17,629
Cash provided by operating activities	54,990	86,145
Investing activities
Decrease in restricted cash	1,455
Capital expenditures	(93,271)	(38,711)
Proceeds from dispositions of property, plant and equipment	22,105	516
Purchases of investments and advances to affiliates	(5,777)	(34,419)
Additions to prepaid royalties	(8,262)	(20,915)
Cash used in investing activities	(83,750)	(93,529)
Financing activities
Payments to retire debt	(1,330)
Net increase (decrease) in borrowings under lines of credit and commercial paper program	34,000	3,681
Net proceeds on other debt	(5,993)	(5,161)
Debt financing costs	(100)	(8)
Dividends paid	(23,327)	(16,269)
Issuance of common stock under incentive plans	5,131	768
Cash provided by (used in) financing activities	8,381	(16,989)
Decrease in cash and cash equivalents	(20,379)	(24,373)
Cash and cash equivalents, beginning of period	138,149	93,593
Cash and cash equivalents, end of period	$ 117,770	$ 69,220

Basis Of Presentation	3 Months Ended
Basis Of Presentation	Mar. 31, 2012
Basis Of Presentation [Abstract]
Basis of Presentation	1. Basis of Presentation The accompanying unaudited condensed consolidated financial statements include the accounts of Arch Coal, Inc. and its subsidiaries and controlled entities (the “Company”). The Company’s primary business is the production of steam and metallurgical coal from surface and underground mines located throughout the United States, for sale to utility, industrial and export markets. On June 15, 2011, the Company acquired International Coal Group, Inc. (“ICG”), as described in Note 3, “Business Combinations”. The Company operates 23 mining complexes in West Virginia, Kentucky, Maryland, Virginia, Illinois, Wyoming, Colorado and Utah. All subsidiaries (except as noted below) 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 period ended March 31, 2012 are not necessarily indicative of results to be expected for the year ending December 31, 2012. 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, 2011 included in the Company’s Annual Report on Form 10-K/A filed with the U.S. Securities and Exchange Commission. The Company owns a 99% membership interest in a joint venture named Arch Western Resources, LLC (“Arch Western”) which operates coal mines in Wyoming, Colorado and Utah. The Company also acts as the managing member of Arch Western.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

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-Name Statement of Position (SOP)
-Number 94-6
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-Name Accounting Research Bulletin (ARB)
-Number 51
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+ Details

Accounting Policies	3 Months Ended
Accounting Policies	Mar. 31, 2012
Accounting Policies [Abstract]
Accounting Policies	2. Accounting Policies There is no new accounting guidance that is expected to have a significant impact on the Company’s financial statements.

Business Combination	3 Months Ended
Business Combination	Mar. 31, 2012
Business Combination [Abstract]
Business Combination	3. Business Combination On June 15, 2011, the Company completed its acquisition of ICG, a leading coal producer. During the first quarter of 2012, the Company finalized the determination of the fair values of the assets acquired and liabilities assumed in the acquisition, with no material adjustments to what was recorded as of December 31, 2011.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

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+ Details

Debt

3 Months Ended

Mar. 31, 2012

Debt [Abstract]

Debt

4 .. Debt


	March 31,	December 31,
	2012	2011
	(In thousands)
Indebtedness to banks under credit facilities	515,300	481,300
6.75% senior notes ($450.0 million face value) due 2013	450,809	450,971
8.75% senior notes ($600.0 million face value) due 2016	589,463	588,974
7.00% senior notes due in 2019 at par	1,000,000	1,000,000
7.25% senior notes due 2020 at par	500,000	500,000
7.25% senior notes due 2021 at par	1,000,000	1,000,000
Other	14,580	21,903
	4,070,152	4,043,148
Less current maturities of debt and short-term borrowings	102,356	280,851
Long-term debt	$ 3,967,796	$ 3,762,297

The current maturities of debt include contractual maturities, as well as amounts borrowed that are supported by credit facilities that have a term of less than one year and amounts borrowed under credit facilities with terms longer than one year that the Company does not intend to refinance on a long-term basis, based on cash projections and management’s plans.

On April 30, 2012, the Company received commitment letters with lending institutions to refinance certain indebtedness having near-term maturities and to increase the Company’s liquidity in order to execute on key long-term growth initiatives, particularly the development of the Company’s metallurgical coal properties. As part of the financing package, these lenders have agreed, subject to certain customary conditions, to enter into an amendment to the existing senior secured revolving credit facility which will, among other things, suspend the Company’s compliance with the debt-to-EBITDA ratio and other financial covenants in the existing credit agreement over the next 24 months and replace them with minimum performance targets at levels consistent with the current coal market environment. We will also receive a $1 billion, six-year term loan facility, which will contain no financial maintenance covenants, and the maximum borrowing capacity of the revolving credit facility will be reduced from $2 billion to $1 billion. The proceeds of the term loan will be used to retire the outstanding $450.0 million aggregate principal amount of 6 ¾% Senior Notes due 2013 issued by Arch Western Finance, LLC (“Arch Western Finance”), the Company’s indirect subsidiary.

On May 1, 2012, Arch Western Finance commenced a cash tender offer for any and all of its outstanding $450.0 million aggregate principal amount of 6 ¾% Senior Notes due 2013. In connection with the tender offer, Arch Western Finance is soliciting consents from the holders of the senior notes for certain proposed amendments to the indenture governing the notes that eliminates most of the covenants and certain default provisions applicable to the senior notes, as well as reduce the minimum notice period in the optional redemption provision of the senior notes from 30 days to three days If Arch Western Finance purchases less than all of the outstanding senior notes in the tender offer, it intends to redeem any senior notes that remain outstanding. The terms and conditions of the tender offer and consent solicitation are described in an Offer to Purchase and Consent Solicitation Statement (the “Statement”) and a related Consent and Letter of Transmittal (the “Letter of Transmittal”), which have been sent to holders of the senior notes. The Consent Solicitation expires on May 14, 2012, prior to which the consideration for each $1,000 of principal is $1,002.50. For notes tendered after the expiration of the Consent Solicitation and before May 29, 2012, the end of the tender offer, the consideration for each $1,000 of principal is $972.50.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Goodwill	3 Months Ended
Goodwill	Mar. 31, 2012
Goodwill [Abstract]
Goodwill	5. Goodwill An approximate 20% drop in the Company’s stock price during the first quarter of 2012, combined with significant decrease in thermal coal demand during the quarter, indicated that the fair value of the Company’s goodwill could be less than its carrying value. Accordingly, we performed the first step of the two-step goodwill impairment test as of March 31, 2012. The fair value of all reporting units that have been assigned goodwill exceeded their respective carrying values, so no further testing was necessary. The value of our Black Thunder reporting unit, where $115.8 million of goodwill has been allocated, would be sensitive to future volume variations should thermal markets weaken further, which could cause us to perform step 2 of the test. The goodwill allocated to certain Appalachia reporting units is particularly sensitive to volatility in the demand for metallurgical coal. Should metallurgical coal markets weaken, it could cause the fair value of the reporting units to be less than their carrying value, requiring us to perform step 2 of the test for impairment. Additionally, further sustained declines in the Company’s stock price below levels experienced in the first quarter would also require us to perform step-2 of the test for impairment. Performance of step 2 of the impairment test, which requires a valuation of individual assets and liabilities of the respective reporting units in order to calculate the implied fair value of goodwill could result in an impairment of goodwill.

Equity Investments And Membership Interests In Joint Ventures

3 Months Ended

Mar. 31, 2012

Equity Investments And Membership Interests In Joint Ventures [Abstract]

Equity Investments and Membership Interests in Joint Ventures

6. Equity Investments and Membership Interests in Joint Ventures

The Company accounts for its investments and membership interests in joint ventures under the equity method of accounting if the Company has the ability to exercise significant influence, but not control, over the entity. Below are the equity method investments reflected in the condensed consolidated balance sheets:


	Knight Hawk	DKRW	Dominion	Tenaska	Millennium	Tongue
	Holdings,	Advanced	Terminal	Trailblazer	Bulk	River
	LLC	Fuels, LLC	Associates	Partners, LLC	Terminals, LLC	Railroad, LLC
In thousands	("KH")	("DKRW")	("DTA")	("Tenaska")	("MBT")	("TRR")	Total

Balance at December 31, 2011	$ 135,225	$ 19,715	$ 16,086	$ 15,266	$ 26,324	$ 12,989	$ 225,605
Investments in affiliates	-	-	-	-	-	-	-
Advances to (distributions from) affiliates, net	(1,801)	-	925	-	2,562	675	2,361
Equity in comprehensive income (loss)	5,243	(879)	(1,254)	-	(557)	-	2,553

Balance at March 31, 2012	$ 138,667	$ 18,836	$ 15,757	$ 15,266	$ 28,329	$ 13,664	$ 230,519

Notes receivable from investees:
Balance at December 31, 2011	$ -	$ 30,751	$ -	$ 5,059	$ -	$ -	$ 35,810
Balance at March 31, 2012	$ -	$ 33,561	$ -	$ 5,031	$ -	$ -	$ 38,592

Summarized financial information of the Company's equity method investees follows:


(In thousands)	Three Months Ended March 31,
	2012			2011

Condensed combined income statement information:
Revenues	$	51,743	$	44,470
Gross profit		2,475		6,084
Income from operations		(376)		3,643
Net income (loss)		(2,437)		2,283
		March 31, 2012		December 31, 2011
Condensed combined balance sheet information:
Current assets	$	94,811	$	94,645
Noncurrent assets		361,918		332,124
Total assets	$	456,729	$	426,769
Current liabilities	$	62,260	$	51,953
Noncurrent liabilities		125,350		120,494
Equity		268,918		254,161
Noncontrolling interest		201		161
Total liabilities and equity	$	456,729	$	426,769

The Company may be required to make future contingent payments of up to $73.0 million related to development financing for certain of its equity investees. The Company’s obligation to make these payments, as well as the timing of any payments required, is contingent upon a number of factors, including project development progress, receipt of permits and construction financing.

- Definition

The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group.

+ References + Details

Derivatives

3 Months Ended

Mar. 31, 2012

Derivatives [Abstract]

Derivatives

7. 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 75 to 80 million gallons of diesel fuel for use in its operations during 2012. To reduce the volatility in the price of diesel fuel for its operations, the Company uses forward physical diesel purchase contracts, as well as heating oil swaps and purchased call options. At March 31, 2012, the Company had protected the price of approximately 85% of its expected purchases for the remainder of fiscal year 2012 and 55% of its first quarter of 2013 purchases.

At March 31, 2012, the Company had purchased heating oil call options for approximately 59 million gallons for the purpose of managing the price risk associated with future diesel purchases. During the first quarter of 2012, the Company determined the effectiveness of the heating oil options could not be established as of December 31, 2011 and on an ongoing basis. As a result, the amount remaining in accumulated other comprehensive income of $8.2 million, or $5.2 net of income taxes, was recorded in earnings, in the “other income, net” line on the condensed consolidated statement of income. The out of period adjustment is not deemed material to prior period results, the expected results of the full 2012 fiscal year or for the trend of earnings of the Company.

The Company also purchased heating oil call options to hedge the fuel surcharges on its barge and rail shipments that cover increases in diesel fuel prices. These positions reduce the Company’s risk of cash flow fluctuations related to these surcharges but the positions are not accounted for as hedges. At March 31, 2012, Company held purchased call options for approximately 15.5 million gallons for the purpose of managing the fluctuations in cash flows associated with fuel surcharges on future shipments.

Coal risk management positions

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

At March 31, 2012, the Company held derivatives for risk management purposes that are expected to settle in the following years :


(Tons in thousands)
	2012	2013	2014	2015
Coal sales	(3,025)	(1,117)	(1,440)	(720)
Coal purchases	417	-	-	-

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 $4.3 million of losses in 2012 and $2.2 million of losses in 2013.

Tabular derivatives disclosures

The Company’s contracts with certain of 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. Such netting arrangements reduce the Company’s credit exposure related to these counterparties. For classification purposes, the Company records the net fair value of all the positions with a given counterparty as a net asset or liability in the consolidated balance sheets. The amounts shown in the table below represent the fair value position of individual contracts, regardless of the net position presented in the accompanying consolidated balance sheets. The fair value and location of derivatives reflected in the accompanying consolidated balance sheets are as follows:


	March 31, 2012			December 31, 2011
Fair Value of Derivatives	Asset	Liability		Asset	Liability
(In thousands)	Derivative	Derivative		Derivative	Derivative
Derivatives Designated as Hedging Instruments
Heating oil — diesel purchases	$ -	$ -		$ 8,997	$ -
Coal	3,256	(218)		1,109	-
Total	3,256	(218)		10,106	-
Derivatives Not Designated as Hedging Instruments
Heating oil — diesel purchases	12,869	-		-	-
Heating oil — fuel surcharges	2,837	-		1,797	-
Coal — held for trading purposes	26,945	(33,411)		15,505	(19,927)
Coal	22,491	(6,119)		14,855	(6,035)
Total	65,142	(39,530)		32,157	(25,962)
Total derivatives	68,398	(39,748)		42,263	(25,962)
Effect of counterparty netting	(30,648)	30,648		(18,134)	18,134
Net derivatives as classified in the balance sheets	$ 37,750	$ (9,100)	$ 28,650	$ 24,129	$ (7,828)	$ 16,301


		March 31,	December 31,
		2012	2011
Net derivatives as reflected on the balance sheets
Heating oil	Other current assets	$ 15,707	$ 10,794
Coal	Coal derivative assets	22,043	13,335
	Coal derivative liabilities	(9,100)	(7,828)
		$ 28,650	$ 16,301

The Company had a current asset for the right to reclaim cash collateral of $15.0 million and $12.4 million at March 31, 2012 and December 31, 2011, respectively. These amounts are not included with the derivatives presented in the table above and are included in “other current assets” in the accompanying consolidated balance sheets.

The effects of derivatives on measures of financial performance are as follows for the three month periods ended March 31:

Three Months Ended March 31

Derivatives used in Fair Value Hedging

Hedged Items in Fair Value

Loss on Hedged Items In Fair

Relationships (in thousands)

Hedge Relationships

Value Hedge Relationships

2012

2011

2012

2011

Coal

Firm commitments


Derivatives used in Cash Flow Hedging Relationships
(in thousands)						Gains (Losses) Reclassified
		Gain (Loss) Recognized in OCI				from OCI into Income
		(Effective Portion)				(Effective Portion)
		2012		2011		2012		2011
Heating oil — diesel purchases	$	-	$	14,258	$	-	$	3,170	(2)
Coal sales		2,493		1,406		201		87	(1)
Coal purchases		(202)		(876)		-		—	(2)
Totals	$	2,291	$	14,788	$	201	$	3,257


		Gain (Loss) Recognized in
		Income (Ineffective Portion
		and Amount Excluded from
		Effectiveness Testing)
		2012		2011
Heating oil — diesel purchases	$	-	$	-
Coal sales		-		-
Coal purchases		-		-
Totals	$	-	$	-


		Derivatives Not Designated as
		Hedging Instruments
		2012		2011
Coal — unrealized	$	7,552	$	(1,045)	(3)
Coal — realized		3,158		-	(4)
Heating oil — diesel purchases		423		-	(4)
Heating oil — fuel surcharges — unrealized	$	367	$	-	(4)

Location in Statement of Income:

(1) — Revenues

(2) — Cost of sales

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

(4) — Other operating income, net

The Company recognized net unrealized and realized losses of $3.9 million and net unrealized and realized gains of $2.8 million during the three months ended March 31, 2012 and 2011, respectively, related to its trading portfolio (including derivative and non‑derivative contracts). These balances are included in the caption “Change in fair value of coal derivatives and coal trading activities, net” in the accompanying consolidated statements of income and are not included in the previous table.

During the next twelve months, based on fair values at March 31, 2012, gains on derivative contracts designated as hedge instruments in cash flow hedges of approximately $3.2 million are expected to be reclassified from other comprehensive income into earnings.

- Definition

The entire disclosure for the entity's entire derivative instruments and hedging activities. Describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising therefrom, and the amounts of and methodologies and assumptions used in determining the amounts of such items.

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+ Details

Inventories

3 Months Ended

Mar. 31, 2012

Inventories [Abstract]

Inventories

8. Inventories

Inventories consist of the following:


	March 31	December 31
	2012	2011
	(In thousands)
Coal	$ 298,744	$ 206,517
Repair parts and supplies	174,747	163,527
Work-in-process	15,195	7,446
	$ 488,686	$ 377,490

The repair parts and supplies are stated net of an allowance for slow-moving and obsolete inventories of $13.4 million at March 31, 2012, and $13.1 million at December 31, 2011.

Fair Value Measurements

3 Months Ended

Mar. 31, 2012

Fair Value Measurements [Abstract]

Fair Value Measurements

9. Fair Value Measurements

The hierarchy of fair value measurements prioritizes the inputs to valuation techniques used to measure fair value. 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 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 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 (primarily coal and heating oil) valued using modeling techniques, such as Black-Scholes, that require the use of inputs, particularly volatility, that are rarely observable. Changes in the unobservable inputs would not have a significant impact on the reported Level 3 fair values at March 31, 2012.

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:


	Fair Value at March 31, 2012
	Total		Level 1		Level 2		Level 3
	(In thousands)
Assets:
Investments in equity securities	$	7,936	$	7,936	$	-	$	-
Derivatives		37,750		20,177		2,068		15,505
Total assets	$	45,686	$	28,113	$	2,068	$	15,505
Liabilities:
Derivatives	$	9,100	$	-	$	6,836	$	2,264

The Company’s contracts with certain of 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, 2012

Balance, beginning of period	$	6,211
Realized and unrealized losses recognized in earnings, net		2,496
Realized and unrealized losses recognized in other comprehensive income, net		-
Purchases		5,261
Issuances		-
Settlements		(727)

Ending balance	$	13,241

Net unrealized gains during the three month period ended March 31, 2012 related to level 3 financial instruments held on March 31, 2012 were $2.8 million.

Fair Value of Long-Term Debt

At March 31, 2012 and December 31, 2011, the fair value of the Company’s senior notes and other long-term debt, including amounts classified as current, was $3.9 billion and $4.2 billion, respectively. Fair values are based upon observed prices in an active market when available or from valuation models using market information.

- 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.

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+ Details

Stock-Based Compensation And Other Incentive Plans	3 Months Ended
Stock-Based Compensation And Other Incentive Plans	Mar. 31, 2012
Stock-Based Compensation And Other Incentive Plans [Abstract]
Stock-Based Compensation And Other Incentive Plans	10. Stock-Based Compensation and Other Incentive Plans During the three months ended March 31, 2012, the Company granted options to purchase approximately1.1 million shares of common stock with a weighted average exercise price of $13.93 per share and a weighted average grant-date fair value of $5.42 per share. The options’ fair value was determined using the Black-Scholes option pricing model, using a weighted average risk-free rate of .767%, a weighted average dividend yield of 3.16% and a weighted average volatility of 60.18%. The options’ expected life is 4.5 years and the options vest ratably over three years, and provide for the continuation of vesting after retirement for recipients that meet certain criteria. The expense for these options will be recognized through the date that the employee first becomes eligible to retire and is no longer required to provide service to earn all or part of the award. The Company has a long-term incentive program that allows for the award of performance units. The total number of units earned by a participant is based on financial and operational performance measures, and may be paid out in cash or in shares of the Company’s common stock. The Company recognizes compensation expense over the three-year term of the grant. Amounts unpaid for all grants under the plan totaled $7.5 million and $9.6 million as of March 31, 2012 and December 31, 2011, respectively.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Workers' Compensation Expense

3 Months Ended

Mar. 31, 2012

Workers' Compensation Expense [Abstract]

Workers' Compensation Expense

11. Workers’ Compensation Expense

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



	Three Months Ended March 31,
	2012	2011
	(In thousands)
Service cost	$ 968	$	193
Interest cost	680		254
Net amortization	277		(101)
Total occupational disease	1,925		346
Traumatic injury claims and assessments	5,176		2,325
Total workers’ compensation expense	$ 7,101	$	2,671

Employee Benefit Plans

3 Months Ended

Mar. 31, 2012

Employee Benefit Plans [Abstract]

Employee Benefit Plans

12. Employee Benefit Plans

The following table details the components of pension benefit costs:


	Three Months Ended March 31,
	2012	2011
	(In thousands)
Service cost	$ 7,596	$ 4,319
Interest cost	3,980	4,131
Expected return on plan assets	(5,538)	(5,468)
Amortization of prior service cost (credit)	(36)	47
Amortization of other actuarial losses	3,571	2,140
Net benefit cost	$ 9,573	$ 5,169

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


	Three Months Ended March 31,
	2012	2011
	(In thousands)
Service cost	$ 549	$ 405
Interest cost	491	498
Amortization of prior service credits	(2,995)	(591)
Amortization of other actuarial gains	(90)	(598)
Net benefit cost (credit)	$ (2,045)	$ (287)

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Implementation Guide (Q and A)
-Number FAS88
-Paragraph 63
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-2
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph q
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 8
-Subparagraph m
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS106-2
-Paragraph 20, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 30
-Paragraph 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Earnings Per Common Share

3 Months Ended

Mar. 31, 2012

Earnings Per Common Share

Earnings Per Common Share

13. Earnings per Common Share

The following table provides the basis for earnings per share calculations by reconciling basic and diluted weighted average shares outstanding:


	Three Months Ended March 31
	2012	2011
	(In thousands)
Weighted average shares outstanding:
Basic weighted average shares outstanding	211,687	162,576
Effect of common stock equivalents under incentive plans	221	1,197
Diluted weighted average shares outstanding	211,908	163,773

The effect of options to purchase 3.0 million and 1.1 million shares of common stock were excluded from the calculation of diluted weighted average shares outstanding for the three month periods ended March 31, 2012 and 2011, respectively, because the exercise price of these options exceeded the average market price of the Company’s common stock for these periods.

Guarantees	3 Months Ended
Guarantees	Mar. 31, 2012
Guarantees
Guarantees	14. Guarantees The Company has agreed to continue to provide surety bonds and letters of credit for the reclamation and retiree healthcare obligations of Magnum Coal Company (“Magnum”) related to the properties the Company sold to Magnum on December 31, 2005. Patriot Coal Corporation (“Patriot”) acquired Magnum in July 2008. The purchase agreement requires Magnum to reimburse the Company for costs related to the surety bonds and letters of credit and to use commercially reasonable efforts to replace the obligations. If the surety bonds and letters of credit related to the reclamation obligations are not replaced by Magnum within a specified period of time, Magnum must post a letter of credit in favor of the Company in the amounts of the reclamation obligations. As of March 31, 2012, Patriot has replaced $48.9 million of the surety bonds and has posted letters of credit of $16.7 million in the Company’s favor. At March 31, 2012, the Company had $38.5 million of surety bonds remaining related to properties sold to Magnum. The surety bonding amounts are mandated by the state and are not directly related to the estimated cost to reclaim the properties. Magnum also acquired certain coal supply contracts with customers who have not consented to the contracts’ assignment from the Company to Magnum. The Company has committed to purchase coal from Magnum to sell to those customers at the same price it is charging the customers for the sale. Under the amended coal supply contracts, as amended, Magnum has the ability to buy out of its obligations under the contract at prices that are predetermined for the remainder of the agreement. Certain other contracts were assigned to Magnum. If Magnum is unable to supply the coal for these coal sales contracts or pay the buy out amount if elected, then the Company would be required to fulfill Magnum’s delivery or payment obligations. The longest of the coal supply contracts extends to the year 2017. At market prices effective at March 31, 2012, the maximum amount to fulfill lMagnum’s obligations under the contracts that have not been assigned over their duration would be approximately $64.1 million, and the cost of purchasing 573 thousand tons of coal to supply the assigned and guaranteed contracts over their duration would exceed the sales price under the contracts by approximately $12.2 million. As the Company does not believe that it is probable that it would have to purchase replacement coal, no losses have been recorded in the consolidated financial statements as of March 31, 2012. However, if the Company would have to perform under these guarantees, it could potentially have a material adverse effect on the business, results of operations and financial condition of the Company. In connection with the Company’s acquisition of the coal operations of Atlantic Richfield Company (ARCO) and the simultaneous combination of the acquired ARCO operations and the Company’s Wyoming operations into the Arch Western joint venture, the Company agreed to indemnify the other member of Arch Western against certain tax liabilities in the event that such liabilities arise prior to June 1, 2013 as a result of certain actions taken, including the sale or other disposition of certain properties of Arch Western, the repurchase of certain equity interests in Arch Western by Arch Western or the reduction under certain circumstances of indebtedness incurred by Arch Western in connection with the acquisition. If the Company were to become liable, the maximum amount of potential future tax payments is $16.3 million at March 31, 2012, which is not recorded as a liability in the Company’s condensed consolidated financial statements. Since the indemnification is dependent upon the initiation of activities within the Company’s control and the Company does not intend to initiate such activities, it is remote that the Company will become liable for any obligation related to this indemnification. However, if such indemnification obligation were to arise, it could potentially have a material adverse effect on the business, results of operations and financial condition of the Company.

Contingencies	3 Months Ended
Contingencies	Mar. 31, 2012
Contingencies
Contingencies	15. Contingencies Allegheny Energy Supply (“Allegheny”), the sole customer of coal produced at the Company’s subsidiary Wolf Run Mining Company’s (“Wolf Run”) Sycamore No. 2 mine, filed a lawsuit against Wolf Run, Hunter Ridge Holdings, Inc. (“Hunter Ridge”), and ICG in state court in Allegheny County, Pennsylvania on December 28, 2006, and amended its complaint on April 23, 2007. Allegheny claimed that Wolf Run breached a coal supply contract when it declared force majeure under the contract upon idling the Sycamore No. 2 mine in the third quarter of 2006, and that Wolf Run continued to breach the contract by failing to ship in volumes referenced in the contract. The Sycamore No. 2 mine was idled after encountering adverse geologic conditions and abandoned gas wells that were previously unidentified and unmapped. After extensive searching for gas wells and rehabilitation of the mine, it was re-opened in 2007, but with notice to Allegheny that it would necessarily operate at reduced volumes in order to safely and effectively avoid the many gas wells within the reserve. The amended complaint also alleged that the production stoppages constitute a breach of the guarantee agreement by Hunter Ridge and breach of certain representations made upon entering into the contract in early 2005. Allegheny voluntarily dropped the breach of representation claims later. Allegheny claimed that it would incur costs in excess of $100 million to purchase replacement coal over the life of the contract. ICG, Wolf Run and Hunter Ridge answered the amended complaint on August 13, 2007, disputing all of the remaining claims. On November 3, 2008, ICG, Wolf Run and Hunter Ridge filed an amended answer and counterclaim against the plaintiffs seeking to void the coal supply agreement due to, among other things, fraudulent inducement and conspiracy. On September 23, 2009, Allegheny filed a second amended complaint alleging several alternative theories of liability in its effort to extend contractual liability to ICG, which was not a party to the original contract and did not exist at the time Wolf Run and Allegheny entered into the contract. No new substantive claims were asserted. ICG answered the second amended complaint on October 13, 2009, denying all of the new claims. ICG’s counterclaim was dismissed on motion for summary judgment entered on May 11, 2010. Allegheny’s claims against ICG were also dismissed by summary judgment, but the claims against Wolf Run and Hunter Ridge were not. The court conducted a non-jury trial of this matter beginning on January 10, 2011 and concluding on February 1, 2011. At the trial, Allegheny presented its evidence for breach of contract and claimed that it is entitled to past and future damages in the aggregate of between $228.0 million and $377.0 million. Wolf Run and Hunter Ridge presented their defense of the claims, including evidence with respect to the existence of force majeure conditions and excuse under the contract and applicable law. Wolf Run and Hunter Ridge presented evidence that Allegheny’s damages calculations were significantly inflated because it did not seek to determine damages as of the time of the breach and in some instances artificially assumed future non-delivery or did not take into account the apparent requirement to supply coal in the future. On May 2, 2011, the trial court entered a Memorandum and Verdict determining that Wolf Run had breached the coal supply contract and that the performance shortfall was not excused by force majeure. ICG and Allegheny filed post-verdict motions in the trial court and on August 23, 2011, the court denied the parties’ motions. The court entered a final judgment on August 25, 2011, in the amount of $104.1 million, which included pre-judgment interest. The parties appealed the lower court’s decision to the Superior Court of Pennsylvania. Wolf Run and Hunter Ridge have filed an appeal bond in the amount of $124.9 million. Briefing is complete and oral argument is scheduled for May 16, 2012. As of March 31, 2012 and December 31, 2011, the Company had accrued $109.8 million and $108.3 million, respectively, for this lawsuit, including interest. The ultimate resolution of this matter could result in an outcome which may be materially different than what the Company has accrued. In addition, the Company is a party to numerous claims and lawsuits with respect to various matters. The Company provides for costs related to contingencies when a loss is probable and the amount is reasonably determinable. After conferring with counsel, it is the opinion of management that the ultimate resolution of pending claims, other than as noted above, will not have a material adverse effect on the consolidated financial condition, results of operations or liquidity of the Company.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

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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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
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-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Segment Information

3 Months Ended

Mar. 31, 2012

Segment Information [Abstract]

Segment Information

16. Segment Information

The Company has three reportable business segments, which are based on the major coal producing basins in which the Company operates. Each of these reportable business segments includes a number of mine complexes. The Company manages its coal sales by coal basin, not by individual mine complex. Geology, coal transportation routes to customers, regulatory environments and coal quality are characteristic to a basin. Accordingly, market and contract pricing have developed by coal basin. Mine operations are evaluated based on their per-ton operating costs (defined as including all mining costs but excluding pass-through transportation expenses), as well as on other non-financial measures, such as safety and environmental performance. The Company’s reportable segments are the Powder River Basin (PRB) segment, with operations in Wyoming; the Western Bituminous (WBIT) segment, with operations in Utah, Colorado and southern Wyoming; the Appalachia (APP) segment, with operations in West Virginia, Kentucky, Maryland and Virginia. The Appalachia segment includes the acquired ICG operations in Appalachia, as well as the Company’s previous Central Appalachia segment. The “Other” operating segment represents primarily the Company’s Illinois operations and ADDCAR subsidiary, which manufactures and sells its patented highwall mining system.

Operating segment results for the three months ended March 31, 2012 and 2011 are presented below. Results for the reportable segments include all direct costs of mining, including all depreciation, depletion and amortization related to the mining operations, even if the assets are not recorded at the operating segment level. See discussion of segment assets below. Corporate, Other and Eliminations includes the change in fair value of coal derivatives and coal trading activities, net; corporate overhead; land management; other support functions; and the elimination of intercompany transactions.

The asset amounts below represent an allocation of assets used in the segments’ cash-generating activities. The amounts in Corporate, Other and Eliminations represent primarily corporate assets (cash, receivables, investments, plant, property and equipment) as well as unassigned coal reserves, above-market acquired sales contracts and other unassigned assets.


				Other	Corporate,
				Operating	Other and
	PRB	APP	WBIT	Segments	Eliminations	Consolidated

Three months ended March 31, 2012
Revenues	$ 401,177	$ 469,058	$ 144,559	$ 24,857	$ -	$ 1,039,651
Income (loss) from operations	32,543	15,835	31,241	(3,750)	(21,788)	54,081
Total assets	2,263,517	4,640,344	752,197	940,245	1,568,815	10,165,118
Depreciation, depletion and amortization	41,223	76,017	18,600	3,687	439	139,966
Amortization of acquired sales contracts, net	(816)	(13,088)	-	(113)	-	(14,017)
Capital expenditures	3,986	66,303	15,137	5,644	2,201	93,271

Three months ended March 31, 2011
Revenues	$ 393,113	$ 155,439	$ 324,386	-	$ -	$ 872,938
Income from operations	46,874	26,892	54,394	-	(25,922)	102,238
Total assets	2,244,173	683,949	710,324	-	1,261,532	4,899,978
Depreciation, depletion and amortization	41,691	20,529	21,016	-	301	83,537
Amortization of acquired sales contracts, net	5,944	-	-	-	-	5,944
Capital expenditures	2,838	11,777	17,302	-	6,794	38,711

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


	Three Months Ended March 31
	2012	2011

Income from operations	$ 54,081	$ 102,238
Interest expense	(74,772)	(34,580)
Interest income	1,021	746
Income before income taxes	$ (19,670)	$ 68,404

- Definition

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

+ References

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

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Supplemental Condensed Consolidating Financial Information

3 Months Ended

Mar. 31, 2012

Supplemental Condensed Consolidating Financial Information [Abstract]

Supplemental Condensed Consolidating Financial Information

17. Supplemental Condensed Consolidating Financial Information

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

Condensed Consolidating Statements of Income

Three Months Ended March 31, 2012


		Guarantor	Non-Guarantor
	Parent/Issuer	Subsidiaries	Subsidiaries	Eliminations	Consolidated
	(In thousands)

Revenues	$ –	$ 498,728	$ 540,923	$ –	$ 1,039,651

Costs, expenses and other
Cost of sales	2,964	425,009	448,054	(25,156)	850,871
Depreciation, depletion and amortization	1,217	100,006	38,744	(1)	139,966
Amortization of acquired sales contracts, net	–	(13,201)	(816)	–	(14,017)
Selling, general and administrative expenses	18,642	1,987	12,046	(1,814)	30,861
Change in fair value of coal derivatives and coal trading activities, net	–	(3,613)	–	–	(3,613)
Other operating (income) expense, net	(3,110)	(37,700)	(4,659)	26,971	(18,498)

	19,713	472,488	493,369	-	985,570

Income from investment in subsidiaries	77,312	–	–	(77,312)	–

Income from operations	57,599	26,240	47,554	(77,312)	54,081
Interest expense, net:
Interest expense	(82,096)	(1,179)	(11,344)	19,847	(74,772)
Interest income	4,827	248	15,793	(19,847)	1,021
	(77,269)	(931)	4,449	-	(73,751)


Income (loss) before income taxes	(19,670)	25,309	52,003	(77,312)	(19,670)
Benefit from income taxes	(22,660)	–	1,581	–	(21,079)

Net income	2,990	25,309	50,422	(77,312)	1,409
Less: Net income attributable to noncontrolling interest	(203)	–	–	–	(203)

Net income attributable to Arch Coal	$ 2,787	$ 25,309	$ 50,422	$ (77,312)	$ 1,206

Total comprehensive income	$ 3,948	$ 27,242	$ 54,831	$ (77,312)	$ 8,709

Condensed Consolidating Statements of Income

Three Months Ended March 31, 2011


		Guarantor	Non-Guarantor
	Parent/Issuer	Subsidiaries	Subsidiaries	Eliminations	Consolidated
	(In thousands)

Revenues	$ –	$ 338,533	$ 534,405	$ –	$ 872,938

Costs, expenses and other
Cost of sales	3,279	251,884	423,323	(24,802)	653,684
Depreciation, depletion and amortization	672	43,277	39,588	–	83,537
Amortization of acquired sales contracts, net	–	–	5,944	–	5,944
Selling, general and administrative expenses	20,336	1,883	9,913	(1,697)	30,435
Change in fair value of coal derivatives and coal trading activities, net	–	(1,784)	–	–	(1,784)
Other operating (income) expense, net	(4,567)	(27,456)	4,408	26,499	(1,116)

	19,720	267,804	483,176	-	770,700

Income from investment in subsidiaries	125,003	–	–	(125,003)	–

Income from operations	105,283	70,729	51,229	(125,003)	102,238
Interest expense, net:
Interest expense	(40,621)	(714)	(10,982)	17,737	(34,580)
Interest income	3,742	296	14,445	(17,737)	746
	(36,879)	(418)	3,463	-	(33,834)

Income (loss) before income taxes	68,404	70,311	54,692	(125,003)	68,404
Benefit from income taxes	12,530	–	–	–	12,530

Net income	55,874	70,311	54,692	(125,003)	55,874
Less: Net income attributable to noncontrolling interest	(273)	–	–	–	(273)

Net income attributable to Arch Coal	$ 55,601	$ 70,311	$ 54,692	$ (125,003)	$ 55,601

Total comprehensive income	$ 66,372	$ 70,253	$ 52,949	$ (125,003)	$ 64,571

Condensed Consolidating Balance Sheets

March 31, 2012


		Guarantor	Non-Guarantor
	Parent/Issuer	Subsidiaries	Subsidiaries	Eliminations	Consolidated
	(In thousands)
Assets
Cash and cash equivalents	$ 35,196	$ 308	$ 82,266	$ –	$ 117,770
Restricted cash-retirement of ICG obligations	8,866	-	-	–	8,866
Receivables	46,832	20,771	295,844	(1,733)	361,714
Inventories	–	256,896	231,790	–	488,686
Other	108,080	79,817	14,186	–	202,083
Total current assets	198,974	357,792	624,086	(1,733)	1,179,119

Property, plant and equipment, net	29,966	6,367,590	1,495,177	–	7,892,733

Investment in subsidiaries	8,886,286	–	–	(8,886,286)	–
Intercompany receivables	(1,443,557)	(41,436)	1,484,993	–	–
Note receivable from Arch Western	225,000	-	-	(225,000)	–
Other	450,008	626,788	16,470	–	1,093,266
Total other assets	8,117,737	585,352	1,501,463	(9,111,286)	1,093,266
Total assets	$ 8,346,677	$ 7,310,734	$ 3,620,726	$ (9,113,019)	$ 10,165,118

Liabilities and Stockholders' Equity
Accounts payable	$ 26,036	$ 134,697	$ 133,608	$ –	$ 294,341
Accrued expenses and other current liabilities	98,109	110,821	159,289	(1,733)	366,486
Current maturities of debt and short-term borrowings	10,876	1,180	90,300	–	102,356
Total current liabilities	135,021	246,698	383,197	(1,733)	763,183
Long-term debt	3,514,463	2,524	450,809		3,967,796
Note payable to Arch Coal	-	–	225,000	(225,000)	-
Asset retirement obligations	891	142,014	289,715	–	432,620
Accrued pension benefits	21,409	4,001	23,968	–	49,378
Accrued postretirement benefits other than pension	13,731	6,272	22,781	–	42,784
Accrued workers' compensation	21,350	45,823	6,839	–	74,012
Deferred income taxes	905,635	76,961	-	–	982,596
Other noncurrent liabilities	150,013	64,098	54,474	–	268,585
Total liabilities	4,762,513	588,391	1,456,783	(226,733)	6,580,954
Redeemable noncontrolling interest	11,739	–	–	–	11,739
Stockholders' equity	3,572,425	6,722,343	2,163,943	(8,886,286)	3,572,425
Total liabilities and stockholders' equity	$ 8,346,677	$ 7,310,734	$ 3,620,726	$ (9,113,019)	$ 10,165,118

Condensed Consolidating Balance Sheets

December 31, 2011

(unaudited)


		Guarantor	Non-Guarantor
	Parent/Issuer	Subsidiaries	Subsidiaries	Eliminations	Consolidated
	(In thousands)
Assets
Cash and cash equivalents	$ 61,375	$ 332	$ 76,442	$ –	$ 138,149
Restricted cash-retirement of ICG obligations	10,322	-	-	–	10,322
Receivables	65,187	22,037	383,572	(1,617)	469,179
Inventories	–	207,050	170,440	–	377,490
Other	81,732	83,122	22,780	–	187,634
Total current assets	218,616	312,541	653,234	(1,617)	1,182,774
Property, plant and equipment, net	21,241	6,403,658	1,524,251	–	7,949,150

Investment in subsidiaries	8,805,731	–	–	(8,805,731)	–
Intercompany receivables	(1,457,864)	7,010	1,450,854	–	–
Note receivable from Arch Western	225,000	-	-	(225,000)	–
Other	184,266	884,613	13,156	–	1,082,035
Total other assets	7,757,133	891,623	1,464,010	(9,030,731)	1,082,035
Total assets	$ 7,996,990	$ 7,607,822	$ 3,641,495	$ (9,032,348)	$ 10,213,959

Liabilities and Stockholders' Equity
Accounts payable	$ 25,409	$ 175,196	$ 183,177	$ –	$ 383,782
Accrued expenses and other current liabilities	75,133	115,685	166,834	(1,617)	356,035
Current maturities of debt and short-term borrowings	172,564	1,987	106,300	–	280,851
Total current liabilities	273,106	292,868	456,311	(1,617)	1,020,668
Long-term debt	3,308,674	2,652	450,971		3,762,297
Note payable to Arch Coal	-	–	225,000	(225,000)	-
Asset retirement obligations	877	140,861	305,046	–	446,784
Accrued pension benefits	19,198	4,203	24,843	–	48,244
Accrued postretirement benefits other than pension	13,843	6,271	22,195	–	42,309
Accrued workers' compensation	17,272	48,111	6,565	–	71,948
Deferred income taxes	621,483	355,270	-	–	976,753
Total liabilities	4,407,416	915,031	1,528,555	(226,617)	6,624,385
Redeemable noncontrolling interest	11,534	–	–	–	11,534
Stockholders' equity	3,578,040	6,692,791	2,112,940	(8,805,731)	3,578,040
Total liabilities and stockholders' equity	$ 7,996,990	$ 7,607,822	$ 3,641,495	$ (9,032,348)	$ 10,213,959

Condensed Consolidating Statements of Cash Flows

Three Months Ended March 31, 2012


		Guarantor	Non-Guarantor
	Parent/Issuer	Subsidiaries	Subsidiaries	Eliminations	Consolidated
	(In thousands)

Cash provided by (used in) operating activities	$ (18,535)	$ 34,078	$ 39,447	$ -	$ 54,990
Investing Activities
Change in restricted cash	1,455	-	-	-	1,455
Capital expenditures	(1,177)	(73,657)	(18,437)	-	(93,271)
Proceeds from dispositions of property, plant and equipment	–	546	21,559	-	22,105
Purchases of investments and advances to affiliates	(3,619)	(3,488)	-	1,330	(5,777)
Additions to prepaid royalties	–	(4,818)	(3,444)		(8,262)

Cash used in investing activities	(3,341)	(81,417)	(322)	1,330	(83,750)
Financing Activities
Contributions from parent	-	1,330		(1,330)	–
Payments to retire ICG debt	-	(1,330)	-	-	(1,330)
Net decrease in borrowings under lines of credit and commercial paper program	34,000	–	–	-	34,000
Net proceeds from other debt	(5,993)	–	–	-	(5,993)
Debt financing costs	(54)	–	(46)	-	(100)
Dividends paid	(23,327)	–	–	-	(23,327)
Issuance of common stock under incentive plans	5,131	–	–	-	5,131
Transactions with affiliates, net	(14,060)	47,315	(33,255)	-	–
Cash provided by (used in) financing activities	(4,303)	47,315	(33,301)	(1,330)	8,381
Increase (decrease) in cash and cash equivalents	(26,178)	(24)	5,823	-	(20,379)
Cash and cash equivalents, beginning of period	61,375	332	76,442	-	138,149
Cash and cash equivalents, end of period	$ 35,196	$ 308	$ 82,266	$ -	$ 117,770

Condensed Consolidating Statements of Cash Flows

Three Months Ended March 31, 2011


		Guarantor	Non-Guarantor
	Parent/Issuer	Subsidiaries	Subsidiaries	Consolidated
	(In thousands)

Cash provided by (used in) operating activities	$ (75,477)	$ 144,796	$ 16,826	$ 86,145
Investing Activities
Capital expenditures	(900)	(23,615)	(14,196)	(38,711)
Proceeds from dispositions of property, plant and equipment	–	502	14	516
Purchases of investments and advances to affiliates	(9,529)	(24,890)	–	(34,419)
Additions to prepaid royalties	–	(20,915)	–	(20,915)
Cash used in investing activities	(10,429)	(68,918)	(14,182)	(93,529)
Financing Activities
Net decrease in borrowings under lines of credit and commercial paper program	-	–	3,681	3,681
Net proceeds from other debt	(5,161)	–	–	(5,161)
Debt financing costs	-	–	(8)	(8)
Dividends paid	(16,269)	–	–	(16,269)
Issuance of common stock under incentive plans	768	–	–	768
Transactions with affiliates, net	95,911	(75,893)	(20,018)	–
Cash provided by (used in) financing activities	75,249	(75,893)	(16,345)	(16,989)
Increase (decrease) in cash and cash equivalents	(10,657)	(15)	(13,701)	(24,373)
Cash and cash equivalents, beginning of period	13,713	64	79,816	93,593
Cash and cash equivalents, end of period	$ 3,056	$ 49	$ 66,115	$ 69,220

Basis Of Presentation (Policy)	3 Months Ended
Basis Of Presentation (Policy)	Mar. 31, 2012
Basis Of Presentation [Abstract]
Basis Of Presentation	1. Basis of Presentation The accompanying unaudited condensed consolidated financial statements include the accounts of Arch Coal, Inc. and its subsidiaries and controlled entities (the “Company”). The Company’s primary business is the production of steam and metallurgical coal from surface and underground mines located throughout the United States, for sale to utility, industrial and export markets. On June 15, 2011, the Company acquired International Coal Group, Inc. (“ICG”), as described in Note 3, “Business Combinations”. The Company operates 23 mining complexes in West Virginia, Kentucky, Maryland, Virginia, Illinois, Wyoming, Colorado and Utah. All subsidiaries (except as noted below) 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 period ended March 31, 2012 are not necessarily indicative of results to be expected for the year ending December 31, 2012. 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, 2011 included in the Company’s Annual Report on Form 10-K/A filed with the U.S. Securities and Exchange Commission. The Company owns a 99% membership interest in a joint venture named Arch Western Resources, LLC (“Arch Western”) which operates coal mines in Wyoming, Colorado and Utah. The Company also acts as the managing member of Arch Western

Debt (Tables)

3 Months Ended

Mar. 31, 2012

Debt [Abstract]

Debt


	March 31,	December 31,
	2012	2011
	(In thousands)
Indebtedness to banks under credit facilities	515,300	481,300
6.75% senior notes ($450.0 million face value) due 2013	450,809	450,971
8.75% senior notes ($600.0 million face value) due 2016	589,463	588,974
7.00% senior notes due in 2019 at par	1,000,000	1,000,000
7.25% senior notes due 2020 at par	500,000	500,000
7.25% senior notes due 2021 at par	1,000,000	1,000,000
Other	14,580	21,903
	4,070,152	4,043,148
Less current maturities of debt and short-term borrowings	102,356	280,851
Long-term debt	$ 3,967,796	$ 3,762,297

Equity Investments And Membership Interests In Joint Ventures (Tables)

3 Months Ended

Mar. 31, 2012

Equity Investments And Membership Interests In Joint Ventures [Abstract]

Schedule Of Equity Method Investments


	Knight Hawk	DKRW	Dominion	Tenaska	Millennium	Tongue
	Holdings,	Advanced	Terminal	Trailblazer	Bulk	River
	LLC	Fuels, LLC	Associates	Partners, LLC	Terminals, LLC	Railroad, LLC
In thousands	("KH")	("DKRW")	("DTA")	("Tenaska")	("MBT")	("TRR")	Total

Balance at December 31, 2011	$ 135,225	$ 19,715	$ 16,086	$ 15,266	$ 26,324	$ 12,989	$ 225,605
Investments in affiliates	-	-	-	-	-	-	-
Advances to (distributions from) affiliates, net	(1,801)	-	925	-	2,562	675	2,361
Equity in comprehensive income (loss)	5,243	(879)	(1,254)	-	(557)	-	2,553

Balance at March 31, 2012	$ 138,667	$ 18,836	$ 15,757	$ 15,266	$ 28,329	$ 13,664	$ 230,519

Notes receivable from investees:
Balance at December 31, 2011	$ -	$ 30,751	$ -	$ 5,059	$ -	$ -	$ 35,810
Balance at March 31, 2012	$ -	$ 33,561	$ -	$ 5,031	$ -	$ -	$ 38,592

Derivatives (Tables)

3 Months Ended

Mar. 31, 2012

Derivatives [Abstract]

Schedule of Price Risk Derivatives


(Tons in thousands)
	2012	2013	2014	2015
Coal sales	(3,025)	(1,117)	(1,440)	(720)
Coal purchases	417	-	-	-

Disclosure Of Fair Value Of Derivatives

	March 31, 2012			December 31, 2011
Fair Value of Derivatives	Asset	Liability		Asset	Liability
(In thousands)	Derivative	Derivative		Derivative	Derivative
Derivatives Designated as Hedging Instruments
Heating oil — diesel purchases	$ -	$ -		$ 8,997	$ -
Coal	3,256	(218)		1,109	-
Total	3,256	(218)		10,106	-
Derivatives Not Designated as Hedging Instruments
Heating oil — diesel purchases	12,869	-		-	-
Heating oil — fuel surcharges	2,837	-		1,797	-
Coal — held for trading purposes	26,945	(33,411)		15,505	(19,927)
Coal	22,491	(6,119)		14,855	(6,035)
Total	65,142	(39,530)		32,157	(25,962)
Total derivatives	68,398	(39,748)		42,263	(25,962)
Effect of counterparty netting	(30,648)	30,648		(18,134)	18,134
Net derivatives as classified in the balance sheets	$ 37,750	$ (9,100)	$ 28,650	$ 24,129	$ (7,828)	$ 16,301


		March 31,	December 31,
		2012	2011
Net derivatives as reflected on the balance sheets
Heating oil	Other current assets	$ 15,707	$ 10,794
Coal	Coal derivative assets	22,043	13,335
	Coal derivative liabilities	(9,100)	(7,828)
		$ 28,650	$ 16,301

Effects Of Derivatives On Measures Of Financial Performance

Three Months Ended March 31

Derivatives used in Fair Value Hedging

Hedged Items in Fair Value

Loss on Hedged Items In Fair

Relationships (in thousands)

Hedge Relationships

Value Hedge Relationships

2012

2011

2012

2011

Coal

Firm commitments


Derivatives used in Cash Flow Hedging Relationships
(in thousands)						Gains (Losses) Reclassified
		Gain (Loss) Recognized in OCI				from OCI into Income
		(Effective Portion)				(Effective Portion)
		2012		2011		2012		2011
Heating oil — diesel purchases	$	-	$	14,258	$	-	$	3,170	(2)
Coal sales		2,493		1,406		201		87	(1)
Coal purchases		(202)		(876)		-		—	(2)
Totals	$	2,291	$	14,788	$	201	$	3,257


		Gain (Loss) Recognized in
		Income (Ineffective Portion
		and Amount Excluded from
		Effectiveness Testing)
		2012		2011
Heating oil — diesel purchases	$	-	$	-
Coal sales		-		-
Coal purchases		-		-
Totals	$	-	$	-


		Derivatives Not Designated as
		Hedging Instruments
		2012		2011
Coal — unrealized	$	7,552	$	(1,045)	(3)
Coal — realized		3,158		-	(4)
Heating oil — diesel purchases		423		-	(4)
Heating oil — fuel surcharges — unrealized	$	367	$	-	(4)

Location in Statement of Income:

(1) — Revenues

(2) — Cost of sales

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

(4) — Other operating income, net

- Definition

Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges.

+ References + Details

Inventories (Tables)

3 Months Ended

Mar. 31, 2012

Inventories [Abstract]

Inventories


	March 31	December 31
	2012	2011
	(In thousands)
Coal	$ 298,744	$ 206,517
Repair parts and supplies	174,747	163,527
Work-in-process	15,195	7,446
	$ 488,686	$ 377,490

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value Measurements [Abstract]

Summary Of Financial Assets And Liabilities Accounted For At Fair Value


	Fair Value at March 31, 2012
	Total		Level 1		Level 2		Level 3
	(In thousands)
Assets:
Investments in equity securities	$	7,936	$	7,936	$	-	$	-
Derivatives		37,750		20,177		2,068		15,505
Total assets	$	45,686	$	28,113	$	2,068	$	15,505
Liabilities:
Derivatives	$	9,100	$	-	$	6,836	$	2,264

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



		Three Months Ended
		March 31, 2012

Balance, beginning of period	$	6,211
Realized and unrealized losses recognized in earnings, net		2,496
Realized and unrealized losses recognized in other comprehensive income, net		-
Purchases		5,261
Issuances		-
Settlements		(727)

Ending balance	$	13,241

- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

+ References + Details

- Definition

The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19279-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 6
-Footnote 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 33
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Workers' Compensation Expense (Tables)

3 Months Ended

Mar. 31, 2012

Workers' Compensation Expense [Abstract]

Workers' Compensation Expense



	Three Months Ended March 31,
	2012	2011
	(In thousands)
Service cost	$ 968	$	193
Interest cost	680		254
Net amortization	277		(101)
Total occupational disease	1,925		346
Traumatic injury claims and assessments	5,176		2,325
Total workers’ compensation expense	$ 7,101	$	2,671

Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2012

Employee Benefit Plans [Abstract]

Pension Benefit Costs


	Three Months Ended March 31,
	2012	2011
	(In thousands)
Service cost	$ 7,596	$ 4,319
Interest cost	3,980	4,131
Expected return on plan assets	(5,538)	(5,468)
Amortization of prior service cost (credit)	(36)	47
Amortization of other actuarial losses	3,571	2,140
Net benefit cost	$ 9,573	$ 5,169

Other Postretirement Benefit Costs


	Three Months Ended March 31,
	2012	2011
	(In thousands)
Service cost	$ 549	$ 405
Interest cost	491	498
Amortization of prior service credits	(2,995)	(591)
Amortization of other actuarial gains	(90)	(598)
Net benefit cost (credit)	$ (2,045)	$ (287)

- Definition

Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2439-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2417-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2410-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=21916443&loc=d3e4179-114921

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 4, 7, 16, 20, 21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 6, 7
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Earnings per Common Share (Tables)

3 Months Ended

Mar. 31, 2012

Earnings Per Common Share

Earnings per Share


	Three Months Ended March 31
	2012	2011
	(In thousands)
Weighted average shares outstanding:
Basic weighted average shares outstanding	211,687	162,576
Effect of common stock equivalents under incentive plans	221	1,197
Diluted weighted average shares outstanding	211,908	163,773

Segment Information (Tables)

3 Months Ended

Mar. 31, 2012

Segment Information [Abstract]

Schedule Of Operating Segment Results


				Other	Corporate,
				Operating	Other and
	PRB	APP	WBIT	Segments	Eliminations	Consolidated

Three months ended March 31, 2012
Revenues	$ 401,177	$ 469,058	$ 144,559	$ 24,857	$ -	$ 1,039,651
Income (loss) from operations	32,543	15,835	31,241	(3,750)	(21,788)	54,081
Total assets	2,263,517	4,640,344	752,197	940,245	1,568,815	10,165,118
Depreciation, depletion and amortization	41,223	76,017	18,600	3,687	439	139,966
Amortization of acquired sales contracts, net	(816)	(13,088)	-	(113)	-	(14,017)
Capital expenditures	3,986	66,303	15,137	5,644	2,201	93,271

Three months ended March 31, 2011
Revenues	$ 393,113	$ 155,439	$ 324,386	-	$ -	$ 872,938
Income from operations	46,874	26,892	54,394	-	(25,922)	102,238
Total assets	2,244,173	683,949	710,324	-	1,261,532	4,899,978
Depreciation, depletion and amortization	41,691	20,529	21,016	-	301	83,537
Amortization of acquired sales contracts, net	5,944	-	-	-	-	5,944
Capital expenditures	2,838	11,777	17,302	-	6,794	38,711

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


	Three Months Ended March 31
	2012	2011

Income from operations	$ 54,081	$ 102,238
Interest expense	(74,772)	(34,580)
Interest income	1,021	746
Income before income taxes	$ (19,670)	$ 68,404

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Supplemental Condensed Consolidating Financial Information (Tables)

3 Months Ended

Mar. 31, 2012

Supplemental Condensed Consolidating Financial Information [Abstract]

Schedule Of Condensed Consolidating Statements Of Income

Condensed Consolidating Statements of Income

Three Months Ended March 31, 2012


		Guarantor	Non-Guarantor
	Parent/Issuer	Subsidiaries	Subsidiaries	Eliminations	Consolidated
	(In thousands)

Revenues	$ –	$ 498,728	$ 540,923	$ –	$ 1,039,651

Costs, expenses and other
Cost of sales	2,964	425,009	448,054	(25,156)	850,871
Depreciation, depletion and amortization	1,217	100,006	38,744	(1)	139,966
Amortization of acquired sales contracts, net	–	(13,201)	(816)	–	(14,017)
Selling, general and administrative expenses	18,642	1,987	12,046	(1,814)	30,861
Change in fair value of coal derivatives and coal trading activities, net	–	(3,613)	–	–	(3,613)
Other operating (income) expense, net	(3,110)	(37,700)	(4,659)	26,971	(18,498)

	19,713	472,488	493,369	-	985,570

Income from investment in subsidiaries	77,312	–	–	(77,312)	–

Income from operations	57,599	26,240	47,554	(77,312)	54,081
Interest expense, net:
Interest expense	(82,096)	(1,179)	(11,344)	19,847	(74,772)
Interest income	4,827	248	15,793	(19,847)	1,021
	(77,269)	(931)	4,449	-	(73,751)


Income (loss) before income taxes	(19,670)	25,309	52,003	(77,312)	(19,670)
Benefit from income taxes	(22,660)	–	1,581	–	(21,079)

Net income	2,990	25,309	50,422	(77,312)	1,409
Less: Net income attributable to noncontrolling interest	(203)	–	–	–	(203)

Net income attributable to Arch Coal	$ 2,787	$ 25,309	$ 50,422	$ (77,312)	$ 1,206

Total comprehensive income	$ 3,948	$ 27,242	$ 54,831	$ (77,312)	$ 8,709

Condensed Consolidating Statements of Income

Three Months Ended March 31, 2011


		Guarantor	Non-Guarantor
	Parent/Issuer	Subsidiaries	Subsidiaries	Eliminations	Consolidated
	(In thousands)

Revenues	$ –	$ 338,533	$ 534,405	$ –	$ 872,938

Costs, expenses and other
Cost of sales	3,279	251,884	423,323	(24,802)	653,684
Depreciation, depletion and amortization	672	43,277	39,588	–	83,537
Amortization of acquired sales contracts, net	–	–	5,944	–	5,944
Selling, general and administrative expenses	20,336	1,883	9,913	(1,697)	30,435
Change in fair value of coal derivatives and coal trading activities, net	–	(1,784)	–	–	(1,784)
Other operating (income) expense, net	(4,567)	(27,456)	4,408	26,499	(1,116)

	19,720	267,804	483,176	-	770,700

Income from investment in subsidiaries	125,003	–	–	(125,003)	–

Income from operations	105,283	70,729	51,229	(125,003)	102,238
Interest expense, net:
Interest expense	(40,621)	(714)	(10,982)	17,737	(34,580)
Interest income	3,742	296	14,445	(17,737)	746
	(36,879)	(418)	3,463	-	(33,834)

Income (loss) before income taxes	68,404	70,311	54,692	(125,003)	68,404
Benefit from income taxes	12,530	–	–	–	12,530

Net income	55,874	70,311	54,692	(125,003)	55,874
Less: Net income attributable to noncontrolling interest	(273)	–	–	–	(273)

Net income attributable to Arch Coal	$ 55,601	$ 70,311	$ 54,692	$ (125,003)	$ 55,601

Total comprehensive income	$ 66,372	$ 70,253	$ 52,949	$ (125,003)	$ 64,571

Schedule Of Condensed Consolidating Balance Sheets

Condensed Consolidating Balance Sheets

March 31, 2012


		Guarantor	Non-Guarantor
	Parent/Issuer	Subsidiaries	Subsidiaries	Eliminations	Consolidated
	(In thousands)
Assets
Cash and cash equivalents	$ 35,196	$ 308	$ 82,266	$ –	$ 117,770
Restricted cash-retirement of ICG obligations	8,866	-	-	–	8,866
Receivables	46,832	20,771	295,844	(1,733)	361,714
Inventories	–	256,896	231,790	–	488,686
Other	108,080	79,817	14,186	–	202,083
Total current assets	198,974	357,792	624,086	(1,733)	1,179,119

Property, plant and equipment, net	29,966	6,367,590	1,495,177	–	7,892,733

Investment in subsidiaries	8,886,286	–	–	(8,886,286)	–
Intercompany receivables	(1,443,557)	(41,436)	1,484,993	–	–
Note receivable from Arch Western	225,000	-	-	(225,000)	–
Other	450,008	626,788	16,470	–	1,093,266
Total other assets	8,117,737	585,352	1,501,463	(9,111,286)	1,093,266
Total assets	$ 8,346,677	$ 7,310,734	$ 3,620,726	$ (9,113,019)	$ 10,165,118

Liabilities and Stockholders' Equity
Accounts payable	$ 26,036	$ 134,697	$ 133,608	$ –	$ 294,341
Accrued expenses and other current liabilities	98,109	110,821	159,289	(1,733)	366,486
Current maturities of debt and short-term borrowings	10,876	1,180	90,300	–	102,356
Total current liabilities	135,021	246,698	383,197	(1,733)	763,183
Long-term debt	3,514,463	2,524	450,809		3,967,796
Note payable to Arch Coal	-	–	225,000	(225,000)	-
Asset retirement obligations	891	142,014	289,715	–	432,620
Accrued pension benefits	21,409	4,001	23,968	–	49,378
Accrued postretirement benefits other than pension	13,731	6,272	22,781	–	42,784
Accrued workers' compensation	21,350	45,823	6,839	–	74,012
Deferred income taxes	905,635	76,961	-	–	982,596
Other noncurrent liabilities	150,013	64,098	54,474	–	268,585
Total liabilities	4,762,513	588,391	1,456,783	(226,733)	6,580,954
Redeemable noncontrolling interest	11,739	–	–	–	11,739
Stockholders' equity	3,572,425	6,722,343	2,163,943	(8,886,286)	3,572,425
Total liabilities and stockholders' equity	$ 8,346,677	$ 7,310,734	$ 3,620,726	$ (9,113,019)	$ 10,165,118

Condensed Consolidating Balance Sheets

December 31, 2011

(unaudited)


		Guarantor	Non-Guarantor
	Parent/Issuer	Subsidiaries	Subsidiaries	Eliminations	Consolidated
	(In thousands)
Assets
Cash and cash equivalents	$ 61,375	$ 332	$ 76,442	$ –	$ 138,149
Restricted cash-retirement of ICG obligations	10,322	-	-	–	10,322
Receivables	65,187	22,037	383,572	(1,617)	469,179
Inventories	–	207,050	170,440	–	377,490
Other	81,732	83,122	22,780	–	187,634
Total current assets	218,616	312,541	653,234	(1,617)	1,182,774
Property, plant and equipment, net	21,241	6,403,658	1,524,251	–	7,949,150

Investment in subsidiaries	8,805,731	–	–	(8,805,731)	–
Intercompany receivables	(1,457,864)	7,010	1,450,854	–	–
Note receivable from Arch Western	225,000	-	-	(225,000)	–
Other	184,266	884,613	13,156	–	1,082,035
Total other assets	7,757,133	891,623	1,464,010	(9,030,731)	1,082,035
Total assets	$ 7,996,990	$ 7,607,822	$ 3,641,495	$ (9,032,348)	$ 10,213,959

Liabilities and Stockholders' Equity
Accounts payable	$ 25,409	$ 175,196	$ 183,177	$ –	$ 383,782
Accrued expenses and other current liabilities	75,133	115,685	166,834	(1,617)	356,035
Current maturities of debt and short-term borrowings	172,564	1,987	106,300	–	280,851
Total current liabilities	273,106	292,868	456,311	(1,617)	1,020,668
Long-term debt	3,308,674	2,652	450,971		3,762,297
Note payable to Arch Coal	-	–	225,000	(225,000)	-
Asset retirement obligations	877	140,861	305,046	–	446,784
Accrued pension benefits	19,198	4,203	24,843	–	48,244
Accrued postretirement benefits other than pension	13,843	6,271	22,195	–	42,309
Accrued workers' compensation	17,272	48,111	6,565	–	71,948
Deferred income taxes	621,483	355,270	-	–	976,753
Total liabilities	4,407,416	915,031	1,528,555	(226,617)	6,624,385
Redeemable noncontrolling interest	11,534	–	–	–	11,534
Stockholders' equity	3,578,040	6,692,791	2,112,940	(8,805,731)	3,578,040
Total liabilities and stockholders' equity	$ 7,996,990	$ 7,607,822	$ 3,641,495	$ (9,032,348)	$ 10,213,959

Schedule Of Condensed Consolidating Statements Of Cash Flows

17. Supplemental Condensed Consolidating Financial Information

Condensed Consolidating Statements of Income

Three Months Ended March 31, 2012


		Guarantor	Non-Guarantor
	Parent/Issuer	Subsidiaries	Subsidiaries	Eliminations	Consolidated
	(In thousands)

Revenues	$ –	$ 498,728	$ 540,923	$ –	$ 1,039,651

Costs, expenses and other
Cost of sales	2,964	425,009	448,054	(25,156)	850,871
Depreciation, depletion and amortization	1,217	100,006	38,744	(1)	139,966
Amortization of acquired sales contracts, net	–	(13,201)	(816)	–	(14,017)
Selling, general and administrative expenses	18,642	1,987	12,046	(1,814)	30,861
Change in fair value of coal derivatives and coal trading activities, net	–	(3,613)	–	–	(3,613)
Other operating (income) expense, net	(3,110)	(37,700)	(4,659)	26,971	(18,498)

	19,713	472,488	493,369	-	985,570

Income from investment in subsidiaries	77,312	–	–	(77,312)	–

Income from operations	57,599	26,240	47,554	(77,312)	54,081
Interest expense, net:
Interest expense	(82,096)	(1,179)	(11,344)	19,847	(74,772)
Interest income	4,827	248	15,793	(19,847)	1,021
	(77,269)	(931)	4,449	-	(73,751)


Income (loss) before income taxes	(19,670)	25,309	52,003	(77,312)	(19,670)
Benefit from income taxes	(22,660)	–	1,581	–	(21,079)

Net income	2,990	25,309	50,422	(77,312)	1,409
Less: Net income attributable to noncontrolling interest	(203)	–	–	–	(203)

Net income attributable to Arch Coal	$ 2,787	$ 25,309	$ 50,422	$ (77,312)	$ 1,206

Total comprehensive income	$ 3,948	$ 27,242	$ 54,831	$ (77,312)	$ 8,709

Condensed Consolidating Statements of Income

Three Months Ended March 31, 2011


		Guarantor	Non-Guarantor
	Parent/Issuer	Subsidiaries	Subsidiaries	Eliminations	Consolidated
	(In thousands)

Revenues	$ –	$ 338,533	$ 534,405	$ –	$ 872,938

Costs, expenses and other
Cost of sales	3,279	251,884	423,323	(24,802)	653,684
Depreciation, depletion and amortization	672	43,277	39,588	–	83,537
Amortization of acquired sales contracts, net	–	–	5,944	–	5,944
Selling, general and administrative expenses	20,336	1,883	9,913	(1,697)	30,435
Change in fair value of coal derivatives and coal trading activities, net	–	(1,784)	–	–	(1,784)
Other operating (income) expense, net	(4,567)	(27,456)	4,408	26,499	(1,116)

	19,720	267,804	483,176	-	770,700

Income from investment in subsidiaries	125,003	–	–	(125,003)	–

Income from operations	105,283	70,729	51,229	(125,003)	102,238
Interest expense, net:
Interest expense	(40,621)	(714)	(10,982)	17,737	(34,580)
Interest income	3,742	296	14,445	(17,737)	746
	(36,879)	(418)	3,463	-	(33,834)

Income (loss) before income taxes	68,404	70,311	54,692	(125,003)	68,404
Benefit from income taxes	12,530	–	–	–	12,530

Net income	55,874	70,311	54,692	(125,003)	55,874
Less: Net income attributable to noncontrolling interest	(273)	–	–	–	(273)

Net income attributable to Arch Coal	$ 55,601	$ 70,311	$ 54,692	$ (125,003)	$ 55,601

Total comprehensive income	$ 66,372	$ 70,253	$ 52,949	$ (125,003)	$ 64,571

Condensed Consolidating Balance Sheets

March 31, 2012


		Guarantor	Non-Guarantor
	Parent/Issuer	Subsidiaries	Subsidiaries	Eliminations	Consolidated
	(In thousands)
Assets
Cash and cash equivalents	$ 35,196	$ 308	$ 82,266	$ –	$ 117,770
Restricted cash-retirement of ICG obligations	8,866	-	-	–	8,866
Receivables	46,832	20,771	295,844	(1,733)	361,714
Inventories	–	256,896	231,790	–	488,686
Other	108,080	79,817	14,186	–	202,083
Total current assets	198,974	357,792	624,086	(1,733)	1,179,119

Property, plant and equipment, net	29,966	6,367,590	1,495,177	–	7,892,733

Investment in subsidiaries	8,886,286	–	–	(8,886,286)	–
Intercompany receivables	(1,443,557)	(41,436)	1,484,993	–	–
Note receivable from Arch Western	225,000	-	-	(225,000)	–
Other	450,008	626,788	16,470	–	1,093,266
Total other assets	8,117,737	585,352	1,501,463	(9,111,286)	1,093,266
Total assets	$ 8,346,677	$ 7,310,734	$ 3,620,726	$ (9,113,019)	$ 10,165,118

Liabilities and Stockholders' Equity
Accounts payable	$ 26,036	$ 134,697	$ 133,608	$ –	$ 294,341
Accrued expenses and other current liabilities	98,109	110,821	159,289	(1,733)	366,486
Current maturities of debt and short-term borrowings	10,876	1,180	90,300	–	102,356
Total current liabilities	135,021	246,698	383,197	(1,733)	763,183
Long-term debt	3,514,463	2,524	450,809		3,967,796
Note payable to Arch Coal	-	–	225,000	(225,000)	-
Asset retirement obligations	891	142,014	289,715	–	432,620
Accrued pension benefits	21,409	4,001	23,968	–	49,378
Accrued postretirement benefits other than pension	13,731	6,272	22,781	–	42,784
Accrued workers' compensation	21,350	45,823	6,839	–	74,012
Deferred income taxes	905,635	76,961	-	–	982,596
Other noncurrent liabilities	150,013	64,098	54,474	–	268,585
Total liabilities	4,762,513	588,391	1,456,783	(226,733)	6,580,954
Redeemable noncontrolling interest	11,739	–	–	–	11,739
Stockholders' equity	3,572,425	6,722,343	2,163,943	(8,886,286)	3,572,425
Total liabilities and stockholders' equity	$ 8,346,677	$ 7,310,734	$ 3,620,726	$ (9,113,019)	$ 10,165,118

Condensed Consolidating Balance Sheets

December 31, 2011

(unaudited)


		Guarantor	Non-Guarantor
	Parent/Issuer	Subsidiaries	Subsidiaries	Eliminations	Consolidated
	(In thousands)
Assets
Cash and cash equivalents	$ 61,375	$ 332	$ 76,442	$ –	$ 138,149
Restricted cash-retirement of ICG obligations	10,322	-	-	–	10,322
Receivables	65,187	22,037	383,572	(1,617)	469,179
Inventories	–	207,050	170,440	–	377,490
Other	81,732	83,122	22,780	–	187,634
Total current assets	218,616	312,541	653,234	(1,617)	1,182,774
Property, plant and equipment, net	21,241	6,403,658	1,524,251	–	7,949,150

Investment in subsidiaries	8,805,731	–	–	(8,805,731)	–
Intercompany receivables	(1,457,864)	7,010	1,450,854	–	–
Note receivable from Arch Western	225,000	-	-	(225,000)	–
Other	184,266	884,613	13,156	–	1,082,035
Total other assets	7,757,133	891,623	1,464,010	(9,030,731)	1,082,035
Total assets	$ 7,996,990	$ 7,607,822	$ 3,641,495	$ (9,032,348)	$ 10,213,959

Liabilities and Stockholders' Equity
Accounts payable	$ 25,409	$ 175,196	$ 183,177	$ –	$ 383,782
Accrued expenses and other current liabilities	75,133	115,685	166,834	(1,617)	356,035
Current maturities of debt and short-term borrowings	172,564	1,987	106,300	–	280,851
Total current liabilities	273,106	292,868	456,311	(1,617)	1,020,668
Long-term debt	3,308,674	2,652	450,971		3,762,297
Note payable to Arch Coal	-	–	225,000	(225,000)	-
Asset retirement obligations	877	140,861	305,046	–	446,784
Accrued pension benefits	19,198	4,203	24,843	–	48,244
Accrued postretirement benefits other than pension	13,843	6,271	22,195	–	42,309
Accrued workers' compensation	17,272	48,111	6,565	–	71,948
Deferred income taxes	621,483	355,270	-	–	976,753
Total liabilities	4,407,416	915,031	1,528,555	(226,617)	6,624,385
Redeemable noncontrolling interest	11,534	–	–	–	11,534
Stockholders' equity	3,578,040	6,692,791	2,112,940	(8,805,731)	3,578,040
Total liabilities and stockholders' equity	$ 7,996,990	$ 7,607,822	$ 3,641,495	$ (9,032,348)	$ 10,213,959

Condensed Consolidating Statements of Cash Flows

Three Months Ended March 31, 2012


		Guarantor	Non-Guarantor
	Parent/Issuer	Subsidiaries	Subsidiaries	Eliminations	Consolidated
	(In thousands)

Cash provided by (used in) operating activities	$ (18,535)	$ 34,078	$ 39,447	$ -	$ 54,990
Investing Activities
Change in restricted cash	1,455	-	-	-	1,455
Capital expenditures	(1,177)	(73,657)	(18,437)	-	(93,271)
Proceeds from dispositions of property, plant and equipment	–	546	21,559	-	22,105
Purchases of investments and advances to affiliates	(3,619)	(3,488)	-	1,330	(5,777)
Additions to prepaid royalties	–	(4,818)	(3,444)		(8,262)

Cash used in investing activities	(3,341)	(81,417)	(322)	1,330	(83,750)
Financing Activities
Contributions from parent	-	1,330		(1,330)	–
Payments to retire ICG debt	-	(1,330)	-	-	(1,330)
Net decrease in borrowings under lines of credit and commercial paper program	34,000	–	–	-	34,000
Net proceeds from other debt	(5,993)	–	–	-	(5,993)
Debt financing costs	(54)	–	(46)	-	(100)
Dividends paid	(23,327)	–	–	-	(23,327)
Issuance of common stock under incentive plans	5,131	–	–	-	5,131
Transactions with affiliates, net	(14,060)	47,315	(33,255)	-	–
Cash provided by (used in) financing activities	(4,303)	47,315	(33,301)	(1,330)	8,381
Increase (decrease) in cash and cash equivalents	(26,178)	(24)	5,823	-	(20,379)
Cash and cash equivalents, beginning of period	61,375	332	76,442	-	138,149
Cash and cash equivalents, end of period	$ 35,196	$ 308	$ 82,266	$ -	$ 117,770

Condensed Consolidating Statements of Cash Flows

Three Months Ended March 31, 2011


		Guarantor	Non-Guarantor
	Parent/Issuer	Subsidiaries	Subsidiaries	Consolidated
	(In thousands)

Cash provided by (used in) operating activities	$ (75,477)	$ 144,796	$ 16,826	$ 86,145
Investing Activities
Capital expenditures	(900)	(23,615)	(14,196)	(38,711)
Proceeds from dispositions of property, plant and equipment	–	502	14	516
Purchases of investments and advances to affiliates	(9,529)	(24,890)	–	(34,419)
Additions to prepaid royalties	–	(20,915)	–	(20,915)
Cash used in investing activities	(10,429)	(68,918)	(14,182)	(93,529)
Financing Activities
Net decrease in borrowings under lines of credit and commercial paper program	-	–	3,681	3,681
Net proceeds from other debt	(5,161)	–	–	(5,161)
Debt financing costs	-	–	(8)	(8)
Dividends paid	(16,269)	–	–	(16,269)
Issuance of common stock under incentive plans	768	–	–	768
Transactions with affiliates, net	95,911	(75,893)	(20,018)	–
Cash provided by (used in) financing activities	75,249	(75,893)	(16,345)	(16,989)
Increase (decrease) in cash and cash equivalents	(10,657)	(15)	(13,701)	(24,373)
Cash and cash equivalents, beginning of period	13,713	64	79,816	93,593
Cash and cash equivalents, end of period	$ 3,056	$ 49	$ 66,115	$ 69,220

Basis Of Presentation (Narrative) (Details)	3 Months Ended
Basis Of Presentation (Narrative) (Details)	Mar. 31, 2012
Basis Of Presentation [Abstract]
Number of mining complexes operated	23
Company's membership interest percentage in joint venture	99.00%

Debt (Narrative) (Details)	3 Months Ended
Debt (Narrative) (Details)	Mar. 31, 2012 USD ($)
Line of credit facility, maximum borrowing capacity	$ 2,000,000,000
Covenant terms, terms favorably reduced, period	2 years
Line of credit facility, current borrowing capacity	$ 1,000,000,000
Loans payable	1,000,000,000
6.75% Senior Notes Due 2013 [Member]
Debt Instrument, Face Amount	$ 450,000,000
Stated interest rate	6.75%
Maximum [Member] \| 6.75% Senior Notes Due 2013 [Member]
Tender offer, offering price per unit of principal	1.0025
Minimum [Member] \| 6.75% Senior Notes Due 2013 [Member]
Tender offer, offering price per unit of principal	0.9725

Debt (Debt) (Details) - USD ($)	Mar. 31, 2012	Dec. 31, 2011
Indebtedness to banks under credit facilities	$ 515,300,000	$ 481,300,000
Other	14,580,000	21,903,000
Total	4,070,152,000	4,043,148,000
Less current maturities of debt and short-term borrowings	102,356,000	280,851,000
Long-term debt	3,967,796,000	3,762,297,000
6.75% Senior Notes Due 2013 [Member]
Senior notes	450,809,000	450,971,000
Face value of senior notes	$ 450,000,000
Senior notes interest rate	6.75%
8.75% Senior Notes Due 2016 [Member]
Senior notes	$ 589,463,000	588,974,000
Face value of senior notes	$ 600,000,000
Senior notes interest rate	8.75%
7.00% Senior Notes Due 2019 [Member]
Senior notes	$ 1,000,000,000	1,000,000,000
Senior notes interest rate	7.00%
7.25% Senior Notes Due 2020 [Member]
Senior notes	$ 500,000,000	500,000,000
Senior notes interest rate	7.25%
7.25% Senior Notes Due 2021 [Member]
Senior notes	$ 1,000,000,000	$ 1,000,000,000
Senior notes interest rate	7.25%

Goodwill (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
Goodwill (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Percentage Increase (Decrease) of Company's stock price during period	(20.00%)
Goodwill	$ 596,103	$ 596,103
Black Thunder [Member]
Goodwill	$ 115,800

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-Clause 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph l
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Equity Investments And Membership Interests In Joint Ventures (Narrative) (Details) $ in Millions	Mar. 31, 2012 USD ($)
Equity Investments And Membership Interests In Joint Ventures [Abstract]
Future development costs, maximum limit	$ 73.0

Equity Investments And Membership Interests In Joint Ventures (Schedule Of Equity Method Investments) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2012 USD ($)
Schedule of Equity Method Investments [Line Items]
Balance at December 31, 2011	$ 225,605
Advances to (distributions from)	2,361
Equity in comprehensive income	2,553
Balance at March 31, 2012	230,519
Balance at December 31, 2011	35,810
Balance at March 31, 2012	38,592
Knight Hawk [Member]
Schedule of Equity Method Investments [Line Items]
Balance at December 31, 2011	135,225
Advances to (distributions from)	(1,801)
Equity in comprehensive income	5,243
Balance at March 31, 2012	138,667
DKRW [Member]
Schedule of Equity Method Investments [Line Items]
Balance at December 31, 2011	19,715
Equity in comprehensive income	(879)
Balance at March 31, 2012	18,836
Balance at December 31, 2011	30,751
Balance at March 31, 2012	33,561
DTA [Member]
Schedule of Equity Method Investments [Line Items]
Balance at December 31, 2011	16,086
Advances to (distributions from)	925
Equity in comprehensive income	(1,254)
Balance at March 31, 2012	15,757
Tenaska [Member]
Schedule of Equity Method Investments [Line Items]
Balance at December 31, 2011	15,266
Balance at March 31, 2012	15,266
Balance at December 31, 2011	5,059
Balance at March 31, 2012	5,031
Millennium [Member]
Schedule of Equity Method Investments [Line Items]
Balance at December 31, 2011	26,324
Advances to (distributions from)	2,562
Equity in comprehensive income	(557)
Balance at March 31, 2012	28,329
Tongue River [Member]
Schedule of Equity Method Investments [Line Items]
Balance at December 31, 2011	12,989
Advances to (distributions from)	675
Balance at March 31, 2012	$ 13,664

Equity Investments And Membership Interests in Joint Ventures (Summarized financial information Of The Company's Equity Method Investees) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Equity Investments And Membership Interests In Joint Ventures [Abstract]
Revenues	$ 51,743	$ 44,470
Gross profit	2,475	6,084
Income from operations	(376)	3,643
Net income (loss)	(2,437)	$ 2,283
Current assets	94,811		$ 94,645
Noncurrent assets	361,918		332,124
Total assets	456,729		426,769
Current liabilities	62,260		51,953
Noncurrent liabilities	125,350		120,494
Equity	268,918		254,161
Noncontrolling interest	201		161
Total liabilities and equity	$ 456,729		$ 426,769

Derivatives (Narrative) (Details) $ in Millions	3 Months Ended
Derivatives (Narrative) (Details) $ in Millions	Mar. 31, 2012 USD ($)	Mar. 31, 2011 USD ($)	Dec. 31, 2011 USD ($)
Current asset for the right to reclaim cash collateral	$ 15.0		$ 12.4
Net unrealized and realized gains (losses) related to trading portfolio	(3.9)	$ 2.8
Gain on derivative contracts designated as hedge instruments in cash flow hedges to be reclassified from OCI into earnings during the next twelve months	3.2
Gain (loss) on components excluded from assessment of price risk hedge effectiveness	$ 8.2
Minimum Purchase [Member]
Gallons of diesel fuel purchased annually	75,000,000
Maximum Purchase [Member]
Gallons of diesel fuel purchased annually	80,000,000
Year One [Member]
Percent of diesel purchases hedged	85.00%
Value of trading portfolio realized	$ (4.3)
Year Two [Member]
Value of trading portfolio realized	$ (2.2)
First Quarter of Year Two [Member]
Percent of diesel purchases hedged	55.00%
Heating Oil-Diesel Purchases [Member]
Quantities under derivative contracts	59,000,000
Heating Oil-Fuel Surchages [Member]
Quantities under derivative contracts	15,500,000

Derivatives (Schedule of Price Risk Derivatives) (Details)	Mar. 31, 2012
Year One [Member] \| Coal Sales [Member]
Derivative [Line Items]
Derivatives Held	(3,025)
Year One [Member] \| Coal Purchases [Member]
Derivative [Line Items]
Derivatives Held	417
Year Two [Member] \| Coal Sales [Member]
Derivative [Line Items]
Derivatives Held	(1,117)
Year Three [Member] \| Coal Sales [Member]
Derivative [Line Items]
Derivatives Held	(1,440)
Year Four [Member] \| Coal Sales [Member]
Derivative [Line Items]
Derivatives Held	(720)

Derivatives (Disclosure Of Fair Value Of Derivatives) (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Derivative Assets	$ 68,398	$ 42,263
Derivative Liabilities	(39,748)	(25,962)
Effect of counterparty netting in derivative assets	(30,648)	(18,134)
Effect of counterparty netting in derivative liabilities	30,648	18,134
Net derivative assets as classified in the balance sheet	37,750	24,129
Net derivative liabilities as classified in the balance sheet	(9,100)	(7,828)
Net derivatives as classified in the balance sheet	28,650	16,301
Coal [Member]
Derivative Assets	22,043	13,335
Net derivative liabilities as classified in the balance sheet	9,100	7,828
Designated as Hedging Instrument [Member]
Derivative Assets	3,256	10,106
Derivative Liabilities	(218)
Designated as Hedging Instrument [Member] \| Coal [Member]
Derivative Assets	3,256	1,109
Derivative Liabilities	(218)
Designated as Hedging Instrument [Member] \| Heating Oil-Diesel Purchases [Member]
Derivative Assets		8,997
Not Designated as Hedging Instrument [Member]
Derivative Assets	65,142	32,157
Derivative Liabilities	(39,530)	(25,962)
Not Designated as Hedging Instrument [Member] \| Coal Held for Trading Purposes [Member]
Derivative Assets	26,945	15,505
Derivative Liabilities	(33,411)	(19,927)
Not Designated as Hedging Instrument [Member] \| Coal [Member]
Derivative Assets	22,491	14,855
Derivative Liabilities	(6,119)	(6,035)
Not Designated as Hedging Instrument [Member] \| Heating Oil-Diesel Purchases [Member]
Derivative Assets	12,869
Not Designated as Hedging Instrument [Member] \| Heating Oil-Fuel Surchages [Member]
Derivative Assets	$ 2,837	$ 1,797

Derivatives (Net Derivatives As Reflected On The Balance Sheets) (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Derivative assets	$ 68,398	$ 42,263
Net derivatives as reflected on the balance sheet	28,650	16,301
Derivative Liabilities	9,100	7,828
Coal [Member]
Derivative assets	22,043	13,335
Derivative Liabilities	(9,100)	(7,828)
Other Current Assets [Member] \| Heating Oil [Member]
Derivative assets	$ 15,707	$ 10,794

- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References + Details

Derivatives (Effects Of Derivatives On Measures Of Financial Performance) (Details) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2012

Mar. 31, 2011

Gain (Loss) Recognized in OCI (Effective Portion)

$ 2,291

$ 14,788

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

201

3,257

Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)

Firm Commitments [Member]

Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge

Coal [Member]

Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge

Coal Purchases [Member]

Gain (Loss) Recognized in OCI (Effective Portion)

^[1]

(202)

(876)

Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)

Coal Sales [Member]

Gain (Loss) Recognized in OCI (Effective Portion)

^[2]

2,493

1,406

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

^[2]

201

Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)

Coal [Member]

Derivatives Not Designated as Hedging Instruments, Losses, Unrealized

^[3]

7,552

(1,045)

Derivatives Not Designated as Hedging Instruments, Gain, Realized

^[3]

3,158

Heating Oil-Diesel Purchases [Member]

Gain (Loss) Recognized in OCI (Effective Portion)

^[1]

14,258

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

^[1]

3,170

Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)

Derivatives Not Designated as Hedging Instruments, Losses, Unrealized

^[3]

423

Heating Oil-Fuel Surchages [Member]

Derivatives Not Designated as Hedging Instruments, Losses, Unrealized

$ 367

[1]	Cost of sales
[2]	Revenues
[3]	Other operating income, net

Inventories (Inventories) (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Inventories [Abstract]
Coal	$ 298,744	$ 206,517
Repair parts and supplies	174,747	163,527
Work-in-process	15,195	7,446
Inventories	488,686	377,490
Allowance for slow-moving and obsolete inventories	$ 13,400	$ 13,100

- Definition

The amount of the valuation account as of the balance sheet date which reduces the carrying amount of inventory to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage. May also provide for estimated product returns or price concessions pertaining to product cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.BB)
-URI http://asc.fasb.org/extlink&oid=6386940&loc=d3e100047-122729

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Paragraph 14
-Chapter 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Paragraph 8, 9, 14
-Chapter 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Section A
-Paragraph 9
-Chapter 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 09
-Article 12

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 6
-Subparagraph a
-Article 5

+ Details

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Fair Value Measurements [Abstract]
Net unrealized gains related to level 3 financial instruments	$ 2.8
Fair value of senior notes and other long-term debt, including amounts classified as current	$ 3,900.0	$ 4,200.0

Fair Value Measurements (Summary Of Financial Assets And Liabilities Accounted For At Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Assets:
Investments in equity securities	$ 7,936
Derivatives	37,750	$ 24,129
Total assets	45,686
Liabilities:
Derivatives	9,100	$ 7,828
Level 1 [Member]
Assets:
Investments in equity securities	7,936
Derivatives	20,177
Total assets	28,113
Level 2 [Member]
Assets:
Derivatives	2,068
Total assets	2,068
Liabilities:
Derivatives	6,836
Level 3 [Member]
Assets:
Derivatives	15,505
Total assets	15,505
Liabilities:
Derivatives	$ 2,264

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References + Details

- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References + Details

- Definition

+ References + Details

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, 2012 USD ($)
Fair Value Measurements [Abstract]
Balance, beginning of period	$ 6,211
Realized and unrealized losses recognized in earnings, net	2,496
Purchases	5,261
Settlements	(727)
Ending balance	$ 13,241

Stock-Based Compensation And Other Incentive Plans (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2012	Jan. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Options issued during period	1.1
Weighted average exercise price of options granted	$ 13.93
Options granted, weighted average grant date fair value	$ 5.42
Option, weighted average risk free rate	0.767%
Option, weighted average dividend yield	3.16%
Option, weighted average volatility	60.18%
Amounts unpaid for all grants	$ 7.5		$ 7.5	$ 9.6
Stock Option [Member]
Expected life of options (Years)		4 years 6 months
Share based awards vesting period		3 years
Restricted Stock [Member]
Share based awards vesting period			3 years

Workers' Compensation Expense (Worker's Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Traumatic injury claims and assessments	$ 5,176	$ 2,325
Total workers' compensation expense	7,101	2,671
Workers' Compensation [Member]
Service cost	968	193
Interest cost	680	254
Net amortization	277	(101)
Net benefit cost (credit)	$ 1,925	$ 346

- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References + Details

- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Service Cost (Component of Net Periodic Pension Cost)
-URI http://asc.fasb.org/extlink&oid=6525008

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
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-Subparagraph a, h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Employee Benefit Plans (Pension And Other Postretirement Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 7,596	$ 4,319
Interest cost	3,980	4,131
Expected return on plan assets	(5,538)	(5,468)
Amortization of prior service cost (credit)	(36)	47
Amortization of other actuarial (gains) losses	3,571	2,140
Net benefit cost (credit)	9,573	5,169
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	549	405
Interest cost	491	498
Amortization of prior service cost (credit)	(2,995)	(591)
Amortization of other actuarial (gains) losses	(90)	(598)
Net benefit cost (credit)	$ (2,045)	$ (287)

- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Glossary Expected Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512136

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 715
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-Glossary Expected Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512171

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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 106
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+ Details

- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References + Details

- Definition

+ References

+ Details

Earnings Per Common Share (Narrative) (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Earnings Per Common Share
Basic, weighted average shares outstanding	211,687	162,576
Effect of common stock equivalents under incentive plans	221	1,197
Diluted weighted average shares outstanding	211,908	163,773
Effect of options to purchase common stock	3,000	1,100

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
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-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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-Subparagraph c
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References + Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
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-Paragraph 1
-Subparagraph (a)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 128
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 128
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 128
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Guarantees (Narrative) (Details) $ in Millions	3 Months Ended
Guarantees (Narrative) (Details) $ in Millions	Mar. 31, 2012 USD ($)
Surety bonds posted in the company's favor	$ 48.9
Letters of credit posted in the Company's favor	16.7
Guarantee obligations, maximum exposure, undiscounted	$ 38.5
Volume of purchased coal in tons	573
Performance Guarantee [Member] \| Magnum [Member]
Guarantee obligations, maximum exposure, undiscounted	$ 64.1
Excess of the current market cost of purchasing coal over the selling price	12.2
Indemnification Agreement [Member]
Guarantee obligations, maximum exposure, undiscounted	$ 16.3

Contingencies (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
Contingencies (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2012	Dec. 31, 2011	Aug. 25, 2011	May 16, 2011	Aug. 13, 2007
Purchase replacement coal					$ 100.0
Damages and interest awarded			$ 104.1
Appeal Bond				$ 124.9
Amount accrued	$ 109.8	$ 108.3
Maximum [Member]
Aggregate amount of past and future damages	377.0
Minimum [Member]
Aggregate amount of past and future damages	$ 228.0

- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
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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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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Segment Information (Narrative) (Details)	3 Months Ended
Segment Information (Narrative) (Details)	Mar. 31, 2012
Segment Information [Abstract]
Number of reportable business segments	three

Segment Information (Schedule Of Operating Segment Results) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Segment Reporting Information [Line Items]
Revenues	$ 1,039,651	$ 872,938
Income (loss) from operations	54,081	102,238
Total assets	10,165,118		$ 10,213,959
Depreciation, depletion and amortization	139,966	83,537
Amortization of acquired sales contacts, net	(14,017)	5,944
Capital expenditures	93,271	38,711
PRB [Member]
Segment Reporting Information [Line Items]
Revenues	401,177	393,113
Income (loss) from operations	32,543	46,874
Depreciation, depletion and amortization	41,223	41,691
Amortization of acquired sales contacts, net	(816)	5,944
Capital expenditures	3,986	2,838
APP [Member]
Segment Reporting Information [Line Items]
Revenues	469,058	155,439
Income (loss) from operations	15,835	26,892
Depreciation, depletion and amortization	76,017	20,529
Amortization of acquired sales contacts, net	(13,088)
Capital expenditures	66,303	11,777
WBIT [Member]
Segment Reporting Information [Line Items]
Revenues	144,559	324,386
Income (loss) from operations	31,241	54,394
Depreciation, depletion and amortization	18,600	21,016
Capital expenditures	15,137	17,302
Other [Member]
Segment Reporting Information [Line Items]
Revenues	24,857
Income (loss) from operations	(3,750)
Depreciation, depletion and amortization	3,687
Amortization of acquired sales contacts, net	(113)
Capital expenditures	5,644
Corporate, Other and Eliminations [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	(21,788)	(25,922)
Depreciation, depletion and amortization	439	301
Capital expenditures	$ 2,201	$ 6,794

Segment Information (Reconciliation Statement Of Segment Income from Operations To Consolidated Income Before Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Income from operations	$ 54,081	$ 102,238
Interest expense	(74,772)	(34,580)
Interest income	1,021	746
Income before income taxes	(19,670)	68,404
Parent/Issuer [Member]
Income from operations	57,599	105,283
Interest expense	(82,096)	(40,621)
Interest income	$ 4,827	$ 3,742

Supplemental Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Statements Of Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenues	$ 1,039,651	$ 872,938
Costs, expenses and other
Cost of sales	850,871	653,684
Depreciation, depletion and amortization	139,966	83,537
Amortization of acquired sales contracts, net	(14,017)	5,944
Selling, general and administrative expenses	30,861	30,435
Change in fair value of coal derivatives and coal trading activities, net	(3,613)	(1,784)
Other operating (income) expense, net	(18,498)	(1,116)
Total operating expenses	985,570	770,700
Income from operations	54,081	102,238
Interest expense	(74,772)	(34,580)
Interest income	1,021	746
Interest expense, net	(73,751)	(33,834)
Income before income taxes	(19,670)	68,404
Benefit from income taxes	(21,079)	12,530
Net income	1,409	55,874
Less: Net income attributable to noncontrolling interest	(203)	(273)
Net income attributable to Arch Coal, Inc.	1,206	55,601
Total comprehensive income	8,709	64,571
Total comprehensive income	8,709	64,571
Parent/Issuer [Member]
Costs, expenses and other
Cost of sales	2,964	3,279
Depreciation, depletion and amortization	1,217	672
Selling, general and administrative expenses	18,642	20,336
Other operating (income) expense, net	(3,110)	(4,567)
Total operating expenses	19,713	19,720
Income from investment in subsidiaries	77,312	125,003
Income from operations	57,599	105,283
Interest expense	(82,096)	(40,621)
Interest income	4,827	3,742
Interest expense, net	(77,269)	(36,879)
Income before income taxes	(19,670)	68,404
Benefit from income taxes	(22,660)	12,530
Net income	2,990	55,874
Less: Net income attributable to noncontrolling interest	(203)	(273)
Net income attributable to Arch Coal, Inc.	2,787	55,601
Total comprehensive income	3,948	66,372
Total comprehensive income	3,948	66,372
Guarantor Subsidiaries [Member]
Revenues	498,728	338,533
Costs, expenses and other
Cost of sales	425,009	251,884
Depreciation, depletion and amortization	100,006	43,277
Amortization of acquired sales contracts, net	(13,201)
Selling, general and administrative expenses	1,987	1,883
Change in fair value of coal derivatives and coal trading activities, net	(3,613)	(1,784)
Other operating (income) expense, net	(37,700)	(27,456)
Total operating expenses	472,488	267,804
Income from operations	26,240	70,729
Interest expense	(1,179)	(714)
Interest income	248	296
Interest expense, net	(931)	(418)
Income before income taxes	25,309	70,311
Net income	25,309	70,311
Net income attributable to Arch Coal, Inc.	25,309	70,311
Total comprehensive income	27,242	70,253
Total comprehensive income	27,242	70,253
Non-Guarantor Subsidiaries [Member]
Revenues	540,923	534,405
Costs, expenses and other
Cost of sales	448,054	423,323
Depreciation, depletion and amortization	38,744	39,588
Amortization of acquired sales contracts, net	(816)	5,944
Selling, general and administrative expenses	12,046	9,913
Other operating (income) expense, net	(4,659)	4,408
Total operating expenses	493,369	483,176
Income from operations	47,554	51,229
Interest expense	(11,344)	(10,982)
Interest income	15,793	14,445
Interest expense, net	4,449	3,463
Income before income taxes	52,003	54,692
Benefit from income taxes	1,581
Net income	50,422	54,692
Net income attributable to Arch Coal, Inc.	50,422	54,692
Total comprehensive income	54,831	52,949
Total comprehensive income	54,831	52,949
Eliminations [Member]
Costs, expenses and other
Cost of sales	(25,156)	(24,802)
Depreciation, depletion and amortization	(1)
Selling, general and administrative expenses	(1,814)	(1,697)
Other operating (income) expense, net	26,971	26,499
Income from investment in subsidiaries	(77,312)	(125,003)
Income from operations	(77,312)	(125,003)
Interest expense	19,847	17,737
Interest income	(19,847)	(17,737)
Income before income taxes	(77,312)	(125,003)
Net income	(77,312)	(125,003)
Net income attributable to Arch Coal, Inc.	(77,312)	(125,003)
Total comprehensive income	(77,312)	(125,003)
Total comprehensive income	$ (77,312)	$ (125,003)

Supplemental Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 117,770	$ 138,149	$ 69,220	$ 93,593
Restricted cash	8,866	10,322
Receivables	361,714	469,179
Inventories	488,686	377,490
Other	202,083	187,634
Total current assets	1,179,119	1,182,774
Property, plant and equipment, net	7,892,733	7,949,150
Other	1,093,266	1,082,035
Total other assets	1,093,266	1,082,035
Total assets	10,165,118	10,213,959
Liabilities and Stockholders' Equity
Accounts payable	294,341	383,782
Accrued expenses and other current liabilities	366,486	356,035
Current maturities of debt and short-term borrowings	102,356	280,851
Total current liabilities	763,183	1,020,668
Long-term debt	3,967,796	3,762,297
Asset retirement obligations	432,620	446,784
Accrued pension benefits	49,378	48,244
Accrued postretirement benefits other than pension	42,784	42,309
Accrued workers' compensation	74,012	71,948
Deferred income taxes	982,596	976,753
Other noncurrent liabilities	268,585	255,382
Total liabilities	6,580,954	6,624,385
Redeemable noncontrolling interest	11,739	11,534
Stockholders' equity	3,572,425	3,578,040
Total liabilities and stockholders' equity	10,165,118	10,213,959
Parent/Issuer [Member]
Assets
Cash and cash equivalents	35,196	61,375	3,056	13,713
Restricted cash	8,866	10,322
Receivables	46,832	65,187
Other	108,080	81,732
Total current assets	198,974	218,616
Property, plant and equipment, net	29,966	21,241
Investment in subsidiaries	8,886,286	8,805,731
Intercompany receivables	(1,443,557)	(1,457,864)
Note receivable from Arch Western	225,000	225,000
Other	450,008	184,266
Total other assets	8,117,737	7,757,133
Total assets	8,346,677	7,996,990
Liabilities and Stockholders' Equity
Accounts payable	26,036	25,409
Accrued expenses and other current liabilities	98,109	75,133
Current maturities of debt and short-term borrowings	10,876	172,564
Total current liabilities	135,021	273,106
Long-term debt	3,514,463	3,308,674
Asset retirement obligations	891	877
Accrued pension benefits	21,409	19,198
Accrued postretirement benefits other than pension	13,731	13,843
Accrued workers' compensation	21,350	17,272
Deferred income taxes	905,635	621,483
Other noncurrent liabilities	150,013
Total liabilities	4,762,513	4,407,416
Redeemable noncontrolling interest	11,739	11,534
Stockholders' equity	3,572,425	3,578,040
Total liabilities and stockholders' equity	8,346,677	7,996,990
Guarantor Subsidiaries [Member]
Assets
Cash and cash equivalents	308	332	49	64
Receivables	20,771	22,037
Inventories	256,896
Other	79,817	83,122
Total current assets	357,792	312,541
Property, plant and equipment, net	6,367,590	6,403,658
Intercompany receivables	(41,436)	7,010
Other	626,788	884,613
Total other assets	585,352	891,623
Total assets	7,310,734	7,607,822
Liabilities and Stockholders' Equity
Accounts payable	134,697	175,196
Accrued expenses and other current liabilities	110,821	115,685
Current maturities of debt and short-term borrowings	1,180	1,987
Total current liabilities	246,698	292,868
Long-term debt	2,524	2,652
Asset retirement obligations	142,014	140,861
Accrued pension benefits	4,001	4,203
Accrued postretirement benefits other than pension	6,272	6,271
Accrued workers' compensation	45,823	48,111
Deferred income taxes	76,961	355,270
Other noncurrent liabilities	64,098
Total liabilities	588,391	915,031
Stockholders' equity	6,722,343	6,692,791
Total liabilities and stockholders' equity	7,310,734	7,607,822
Non-Guarantor Subsidiaries [Member]
Assets
Cash and cash equivalents	82,266	76,442	$ 66,115	$ 79,816
Receivables	295,844	383,572
Inventories	231,790
Other	14,186	22,780
Total current assets	624,086	653,234
Property, plant and equipment, net	1,495,177	1,524,251
Intercompany receivables	1,484,993	1,450,854
Other	16,470	13,156
Total other assets	1,501,463	1,464,010
Total assets	3,620,726	3,641,495
Liabilities and Stockholders' Equity
Accounts payable	133,608	183,177
Accrued expenses and other current liabilities	159,289	166,834
Current maturities of debt and short-term borrowings	90,300	106,300
Total current liabilities	383,197	456,311
Long-term debt	450,809	450,971
Note payable to Arch Coal	225,000	225,000
Asset retirement obligations	289,715	305,046
Accrued pension benefits	23,968	24,843
Accrued postretirement benefits other than pension	22,781	22,195
Accrued workers' compensation	6,839	6,565
Other noncurrent liabilities	54,474
Total liabilities	1,456,783	1,528,555
Stockholders' equity	2,163,943	2,112,940
Total liabilities and stockholders' equity	3,620,726	3,641,495
Eliminations [Member]
Assets
Receivables	(1,733)	(1,617)
Total current assets	(1,733)	(1,617)
Investment in subsidiaries	(8,886,286)	(8,805,731)
Note receivable from Arch Western	(225,000)	(225,000)
Total other assets	(9,111,286)	(9,030,731)
Total assets	(9,113,019)	(9,032,348)
Liabilities and Stockholders' Equity
Accrued expenses and other current liabilities	(1,733)	(1,617)
Total current liabilities	(1,733)	(1,617)
Note payable to Arch Coal	(225,000)	(225,000)
Total liabilities	(226,733)	(226,617)
Stockholders' equity	(8,886,286)	(8,805,731)
Total liabilities and stockholders' equity	$ (9,113,019)	$ (9,032,348)

Supplemental Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Statements Of Cash Flows) (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Dec. 31, 2011	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Cash provided by (used in) operating activities		$ 54,990	$ 86,145
Investing Activities
Change in restricted cash		1,455
Capital expenditures		(93,271)	(38,711)
Proceeds from dispositions of property, plant and equipment		22,105	516
Purchases of investments and advances to affiliates		(5,777)	(34,419)
Additions to prepaid royalties		(8,262)	(20,915)
Cash used in investing activities		(83,750)	(93,529)
Financing Activities
Payments to retire debt		(1,330)
Net increase (decrease) in borrowings under lines of credit and commercial paper program		34,000	3,681
Net proceeds on other debt		(5,993)	(5,161)
Debt financing costs		(100)	(8)
Dividends paid		(23,327)	(16,269)
Issuance of common stock under incentive plans		5,131	768
Cash provided by (used in) financing activities	$ 8,381	8,381	(16,989)
Increase (decrease) in cash and cash equivalents		(20,379)	(24,373)	$ (20,379)
Cash and cash equivalents, beginning of period		138,149	93,593	93,593
Cash and cash equivalents, end of period	138,149	117,770	69,220	138,149
Parent/Issuer [Member]
Cash provided by (used in) operating activities		(18,535)	(75,477)
Investing Activities
Change in restricted cash		1,455
Capital expenditures		(1,177)	(900)
Purchases of investments and advances to affiliates		(3,619)	(9,529)
Cash used in investing activities		(3,341)	(10,429)
Financing Activities
Net increase (decrease) in borrowings under lines of credit and commercial paper program		34,000
Net proceeds on other debt		(5,993)	(5,161)
Debt financing costs		(54)
Dividends paid		(23,327)	(16,269)
Issuance of common stock under incentive plans		5,131	768
Transactions with affiliates, net		(14,060)	95,911
Cash provided by (used in) financing activities	(4,303)		75,249
Increase (decrease) in cash and cash equivalents			(10,657)	(26,178)
Cash and cash equivalents, beginning of period		61,375	13,713	13,713
Cash and cash equivalents, end of period	61,375	35,196	3,056	61,375
Guarantor Subsidiaries [Member]
Cash provided by (used in) operating activities		34,078	144,796
Investing Activities
Capital expenditures		(73,657)	(23,615)
Proceeds from dispositions of property, plant and equipment		546	502
Purchases of investments and advances to affiliates		(3,488)	(24,890)
Additions to prepaid royalties		(4,818)	(20,915)
Cash used in investing activities		(81,417)	(68,918)
Financing Activities
Contributions from parent		1,330
Payments to retire debt		(1,330)
Transactions with affiliates, net		47,315	(75,893)
Cash provided by (used in) financing activities	47,315		(75,893)
Increase (decrease) in cash and cash equivalents			(15)	(24)
Cash and cash equivalents, beginning of period		332	64	64
Cash and cash equivalents, end of period	332	308	49	332
Non-Guarantor Subsidiaries [Member]
Cash provided by (used in) operating activities		39,447	16,826
Investing Activities
Capital expenditures		(18,437)	(14,196)
Proceeds from dispositions of property, plant and equipment		21,559	14
Additions to prepaid royalties		(3,444)
Cash used in investing activities		(322)	(14,182)
Financing Activities
Net increase (decrease) in borrowings under lines of credit and commercial paper program			3,681
Debt financing costs		(46)	(8)
Transactions with affiliates, net		(33,255)	(20,018)
Cash provided by (used in) financing activities	(33,301)		(16,345)
Increase (decrease) in cash and cash equivalents			(13,701)	5,823
Cash and cash equivalents, beginning of period		76,442	79,816	79,816
Cash and cash equivalents, end of period	76,442	82,266	$ 66,115	$ 76,442
Eliminations [Member]
Investing Activities
Purchases of investments and advances to affiliates		1,330
Cash used in investing activities		1,330
Financing Activities
Contributions from parent		$ (1,330)
Cash provided by (used in) financing activities	$ (1,330)