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Condensed Consolidated Statements of Income	3 Months Ended			6 Months Ended
Condensed Consolidated Statements of Income	Jun. 30, 2009 USD ($) $ / shares shares	Jun. 30, 2008 shares	Jun. 30, 2008 USD ($) $ / shares	Jun. 30, 2009 USD ($) $ / shares shares	Jun. 30, 2008 USD ($) $ / shares shares
REVENUES
Coal sales	$ 554,612,000		$ 785,117,000	$ 1,235,652,000	$ 1,484,467,000
COSTS, EXPENSES AND OTHER
Cost of coal sales	467,521,000		568,483,000	1,014,647,000	1,082,887,000
Depreciation, depletion and amortization	68,477,000		71,953,000	141,518,000	144,995,000
Selling, general and administrative expenses	21,627,000		33,022,000	46,741,000	58,702,000
Change in fair value of coal derivatives and coal trading activities, net	(6,458,000)		(53,160,000)	(6,986,000)	(83,718,000)
Costs related to acquisition of Jacobs Ranch	3,025,000		0	6,375,000	0
Other operating income, net	(6,889,000)		(4,405,000)	(12,524,000)	(4,347,000)
Total operating expenses	547,303,000		615,893,000	1,189,771,000	1,198,519,000
Gain (Loss) on Disposition of Assets [Abstract]
Income from operations	7,309,000		169,224,000	45,881,000	285,948,000
Interest expense, net
Interest expense	(20,657,000)		(18,721,000)	(40,675,000)	(39,209,000)
Interest income	417,000		468,000	6,885,000	893,000
Interest expense, net	(20,240,000)		(18,253,000)	(33,790,000)	(38,316,000)
Income (loss) before income taxes	(12,931,000)		150,971,000	12,091,000	247,632,000
Provision for (benefit from) income taxes	2,230,000		37,700,000	(3,320,000)	52,940,000
Net income (loss)	(15,161,000)		113,271,000	15,411,000	194,692,000
Less: Net (income) loss attributable to noncontrolling interest	35,000		(274,000)	42,000	(548,000)
Net income (loss) attributable to Arch Coal, Inc.	$ (15,126,000)		$ 112,997,000	$ 15,453,000	$ 194,144,000
EARNINGS (LOSS) PER COMMON SHARE
Basic earnings (loss) per common share \| $ / shares	$ (0.11)		$ 0.78	$ 0.11	$ 1.35
Diluted earnings (loss) per common share \| $ / shares	$ (0.11)		$ 0.78	$ 0.11	$ 1.34
Basic weighted average shares outstanding \| shares	142,815,000	144,120,000		142,802,000	143,809,000
Diluted weighted average shares outstanding \| shares	142,815,000	145,049,000		142,924,000	144,823,000
Dividends declared per common share \| (per share)	$ 0.09	shares 0.09		$ 0.18	$ 0.16

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2009	Dec. 31, 2008
Current assets:
Cash and cash equivalents	$ 50,560	$ 70,649
Trade accounts receivable	172,085	215,053
Other receivables	31,105	43,419
Inventories	240,828	191,568
Prepaid royalties	23,582	43,780
Deferred income taxes	23,872	52,918
Coal derivative assets	23,408	43,173
Other	40,461	45,818
Total current assets	605,901	706,378
Assets Held-for-sale, Current [Abstract]
Property, plant and equipment, net	2,783,686	2,703,083
Other assets:
Prepaid royalties	92,468	66,918
Goodwill	46,832	46,832
Deferred income taxes	315,605	294,682
Equity investments	88,864	87,761
Other	95,641	73,310
Total other assets	639,410	569,503
Total assets	4,028,997	3,978,964
Current liabilities:
Accounts payable	140,739	186,322
Coal derivative liabilities	7,036	10,757
Accrued expenses and other current liabilities	187,068	249,203
Current maturities of debt and short-term borrowings	195,522	213,465
Total current liabilitiies	530,365	659,747
Customer Advances and Deposits, Current [Abstract]
Long-term debt	1,240,793	1,098,948
Asset retirement obligations	265,904	255,369
Accrued pension benefits	75,976	73,486
Accrued postretirement benefits other than pension	60,250	58,163
Accrued workers' compensation	26,527	30,107
Other noncurrent liabilities	69,724	65,526
Total liabilities	2,269,539	2,241,346
Temporary Equity [Abstract]
Redeemable noncontrolling interest	8,844	8,885
Stockholders' equity:
Common stock, $0.01 par value, authorized 260,000 shares, issued 144,400 and 144,345 shares, respectively	1,448	1,447
Paid-in capital	1,388,454	1,381,496
Treasury stock, 1,512 shares at June 30, 2009 and December 31, 2008, at cost	(53,848)	(53,848)
Retained earnings	468,462	478,734
Accumulated other comprehensive loss	(53,902)	(79,096)
Total stockholders' equity	1,750,614	1,728,733
Total liabilities and stockholders' equity	$ 4,028,997	$ 3,978,964

Condensed Consolidated Balance Sheets [Parenthetical] shares in Thousands	Jun. 30, 2009 shares	Dec. 31, 2008 shares
Condensed Consolidated Balance Sheets [Parenthetical]
Common Stock, Par or Stated Value Per Share	pure 0.01	pure 0.01
Common Stock, Shares Authorized	260,000	260,000
Common Stock, Shares, Issued	144,400	144,345
Treasury Stock, Shares	1,512	1,512

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2009	Jun. 30, 2008
OPERATING ACTIVITIES
Net income	$ 15,411	$ 194,692
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation, depletion and amortization	141,518	144,995
Prepaid royalties expensed	17,173	16,544
Gain on dispositions of property, plant and equipment	(286)	(179)
Employee stock-based compensation	6,901	6,921
Changes in:
Receivables	60,982	(21,572)
Inventories	(49,260)	500
Coal derivative assets and liabilities	16,830	(88,769)
Accounts payable, accrued expenses and other current liabilities	(51,760)	52,239
Deferred income taxes	(5,751)	10,926
Other	8,433	19,218
Increase (Decrease) in over (under) Energy Recovery [Abstract]
Cash provided by operating activities	160,191	335,515
INVESTING ACTIVITIES
Capital expenditures	(246,562)	(336,080)
Proceeds from dispositions of property, plant and equipment	715	1,070
Purchases of investments and advances to affiliates	(9,463)	(2,994)
Additions to prepaid royalties	(22,524)	(19,079)
Reimbursement of deposits on equipment	3,209	2,455
Cash used in investing activities	(274,625)	(354,628)
FINANCING ACTIVITIES
Net increase in borrowings under lines of credit and commercial paper program	134,349	41,016
Net payments on other debt	(9,763)	(8,895)
Debt financing costs	(4,574)	(219)
Dividends paid	(25,725)	(22,996)
Issuance of common stock under incentive plans	58	6,288
Cash provided by financing activities	94,345	15,194
Effect of Exchange Rate on Cash and Cash Equivalents [Abstract]
Decrease in cash and cash equivalents	(20,089)	(3,919)
Cash and cash equivalents, beginning of period	70,649	5,080
Cash and cash equivalents, end of period	$ 50,560	$ 1,161

Basis of Presentation	6 Months Ended
Basis of Presentation	Jun. 30, 2009
Basis of Presentation
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	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. The Company’s mines are located in southern West Virginia, eastern Kentucky, Virginia, 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 and six month periods ended June 30, 2009 are not necessarily indicative of results to be expected for the year ending December 31, 2009. 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, 2008 included in the Company’s Annual Report on Form 10-K 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.

Accounting Policies	6 Months Ended
Accounting Policies	Jun. 30, 2009
Accounting Policies
Significant Accounting Policies [Text Block]	2. Accounting Policies *New Accounting Pronouncements* On January 1, 2009, the Company adopted Statement of Financial Accounting Standards No. 160, Noncontrolling Interests in Consolidated Financial Statements, an amendment of ARB No. 51 (“Statement No. 160”). Statement No. 160 requires that a noncontrolling interest (previously referred to as minority interest) in a consolidated subsidiary be displayed in the consolidated balance sheet as a separate component of equity and the amount of net income attributable to the noncontrolling interest be included in consolidated net income on the face of the consolidated statement of income. Because the noncontrolling interest in Arch Western is redeemable, it is presented in the “mezzanine” between liabilities and equity. The adoption of Statement No. 160 resulted in a decrease in other liabilities of $8.9 million as of December 31, 2008 from what was previously reported for the reclassification of the noncontrolling interest in Arch Western. The adoption of Statement No. 160 resulted in an increase in other operating income, net and an increase in net income of $0.3 million for the three months ended June 30, 2008 from what was previously reported for the amount of income attributable to the noncontrolling interest in Arch Western. For the six months ended June 30, 2008 the adoption of Statement No. 160 resulted in an increase in other operating income, net and an increase in net income of $0.5 million from what was previously reported for the amount of income attributable to the noncontrolling interest in Arch Western. On January 1, 2009, the Company adopted Statement of Financial Accounting Standards No. 161, Disclosures about Derivative Instruments and Hedging Activities, an amendment of FASB Statement No. 133 (“Statement No. 161”). Statement No. 161 requires additional disclosures about derivatives and hedging activities, including qualitative disclosures about objectives for using derivatives. It also requires tabular disclosures about the gross fair value of derivative instruments, gains and losses from derivative instruments by type of contract, and the locations of these amounts in the interim and annual financial statements. See Note 5, “Derivatives” for the disclosures required by Statement No. 161. On January 1, 2009, Statement of Financial Accounting Standards No. 141(R), Business Combinations (“Statement No. 141(R)”) and Staff Position FAS 141(R)-1, Accounting for Assets Acquired and Liabilities Assumed in Business Combination that Arise from Contingencies, (“FSP FAS 141(R)-1”) became effective. The provisions of Statement No. 141(R) are effective for any business combinations that occur on or after January 1, 2009. Statement No. 141(R) clarifies and amends the accounting guidance for the acquirer’s recognition and measurement of the assets acquired, liabilities assumed and any noncontrolling interest in the acquiree in a business combination. FSP FAS 141(R)-1 amends Statement No. 141(R) and previous guidance, requiring that assets acquired and liabilities assumed in a business combination that arise from pre-acquisition contingencies be recognized at fair value in accordance with Statement of Financial Accounting Standards No. 157 (“Statement No. 157”) and amending disclosure requirements to include changes in the range of possible outcomes for both recognized and reasonably possible unrecognized pre-acquisition contingencies. On January 1, 2009, the Company adopted Staff Position No. EITF 03-6-01 Determining Whether Instruments Granted in Share-Based Payment Transactions Are Participating Securities(“FSP EITF 03-6-01”). FSP EITF 03-6-01 clarifies whether instruments granted in share-based payment transactions are participating securities prior to vesting and therefore need to be included in the earnings allocation in computing earnings per share under the two-class method. FSP EITF 03-6-01 had no effect on basic or diluted earnings per share for the three and six months ended June 30, 2009 and June 30, 2008. On January 1, 2009, the Company adopted Staff Position FAS 157-2, Effective Date of FASB Statement No. 157, (“FSP FAS 157-2”) prospectively for the Company’s fair value measurements other than those that are recognized or disclosed at fair value in the financial statements on a recurring basis. FSP FAS 157-2 deferred the effective date of Statement No. 157 for nonfinancial assets and nonfinancial liabilities. FSP FAS 157-2 is effective for all fair value measurements prescribed by generally accepted accounting principles for nonfinancial assets and nonfinancial liabilities after the date of adoption; however, there was no transition impact upon initial adoption. In June 2009, Statement of Financial Accounting Standards No. 165, Subsequent Events (“Statement No. 165”) became effective. Statement No. 165 describes circumstances under which an entity shall recognize events or transactions occurring after the balance sheet date in its financial statements and requires disclosures related to those events. See Note 17, “Subsequent Events” for the disclosures required by Statement No. 165.

Business Combination	6 Months Ended
Business Combination	Jun. 30, 2009
Business Combinations
Business Combinations	3. Business Combinations On March 8, 2009, the Company entered into an agreement to purchase the Jacobs Ranch mining complex in the Powder River Basin from Rio Tinto Energy America for a purchase price of $761.0 million. At December 31, 2008, Jacobs Ranch controlled approximately 381 million tons of coal reserves as reported by Rio Tinto Energy America, which are adjacent to the Company’s Black Thunder mining complex. The Company recognized costs of $3.0 million and $6.4 million related to the potential acquisition in the accompanying condensed consolidated statement of income for the three and six months ended June 30, 2009, respectively, in accordance with Statement No. 141(R). The completion of the transaction is subject to certain governmental and regulatory conditions and approvals, including those under competition laws and regulations, and other customary conditions. There can be no assurance that the transaction will be completed as contemplated in the agreement.

Fair Value Measurements

6 Months Ended

Jun. 30, 2009

Fair Value Measurements

Fair Value Disclosures [Text Block]

4. Fair Value Measurements

Statement No. 157 establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy, as defined below, gives 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 not observable.

The table below sets forth, by level, the Company’s financial assets and liabilities that are accounted for at fair value:

	Fair Value at June 30, 2009
	Total	Level 1	Level 2	Level 3
	(In thousands)
Assets:
Investments in equity securities..........................	$ 3,018	$ 2,329	$ —	$ 689
Derivatives..............................................................	23,408	2,130	20,447	831
Total assets.......................................................	$ 26,426	$ 4,459	$ 20,447	$ 1,520

Liabilities:
Derivatives..............................................................	$ 22,068	$ —	$ 26,232	$ (4,164)

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 June 30, 2009	Six Months Ended June 30, 2009
	(In thousands)
Beginning balance..................................................................................................	$ 2,666	$ 1,050
Realized and unrealized losses recognized in earnings....................................	(801)	(1,188)
Realized and unrealized gains recognized in other comprehensive income..	2,160	2,480
Settlements, purchases and issuances...............................................................	1,659	3,342
Ending balance.......................................................................................................	$ 5,684	$ 5,684

Net unrealized gains during the three and six months ended June 30, 2009 related to level 3 financial instruments held on June 30, 2009 were $0.6 million and $0.8 million, respectively.

Derivatives

6 Months Ended

Jun. 30, 2009

Derivatives

Derivatives Text Block

5. Derivatives

The Company generally utilizes derivative financial instruments to manage exposures to commodity prices. Additionally, the Company may hold certain coal derivative financial instruments for trading purposes.

All derivative financial instruments are recognized in the balance sheet at fair value. In a fair value hedge, the Company hedges the risk of changes in the fair value of a firm commitment, typically a fixed-price coal sales contract. Changes in both the hedged firm commitment and the fair value of a derivative used as a hedge instrument in a fair value hedge are recorded in earnings. In a cash flow hedge, the Company hedges the risk of changes in future cash flows related to a forecasted purchase or sale. Changes in the fair value of the derivative instrument used as a hedge instrument in a cash flow hedge are recorded in other comprehensive income. Amounts in other comprehensive income are reclassified to earnings when the hedged transaction affects earnings and are classified in a manner consistent with the transaction being hedged. The Company formally documents the relationships between hedging instruments and the respective hedged items, as well as its risk management objectives for hedge transactions.

The Company evaluates the effectiveness of its hedging relationships both at the hedge’s inception and on an ongoing basis. Any ineffective portion of the change in fair value of a derivative instrument used as a hedge instrument in a fair value or cash flow hedge is recognized immediately in earnings. The ineffective portion is based on the extent to which exact offset is not achieved between the change in fair value of the hedge instrument and the cumulative change in expected future cash flows on the hedged transaction from inception of the hedge in a cash flow hedge or the change in the fair value of the firm commitment in a fair value hedge.

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 purchases approximately 45-50 million gallons of diesel fuel annually in its operations. 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 June 30, 2009, the Company had protected the price of approximately 67% of its remaining expected purchases for fiscal year 2009 and 54% of its expected purchases for fiscal year 2010. Since the changes in the price of heating oil highly correlate to changes in the price of the hedged diesel fuel purchases, the heating oil swaps and purchased call options qualify for cash flow hedge accounting. The Company held heating oil swaps and purchased call options for approximately 34.7 million gallons as of June 30, 2009.

Coal risk management positions

The Company may sell or purchase forward contracts 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 June 30, 2009, the Company held derivatives for risk management purposes totaling 0.4 million tons of coal purchases that are expected to settle during the remainder of 2009 and 0.1 million tons of coal purchases that are expected to settle in 2010.

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 may also include nonderivative contracts in its trading portfolio. The Company is exposed to the risk of changes in coal prices on its coal trading portfolio. The timing of the estimated future realization of the value of the trading portfolio is 63% in the remainder of 2009, 25% in 2010 and 12% in 2011.

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 our credit exposure related to these counterparties. For classification purposes, the Company records the net fair value of all the positions with these counterparties as a net asset or liability. The amounts shown in the table below represent the fair value position of individual contracts, regardless of the net position presented in the accompanying condensed consolidated balance sheet. The fair value and location of derivatives reflected in the accompanying condensed consolidated balance sheet are as follows:

As of June 30, 2009 (in thousands)	Fair Value
	Asset Derivatives		Liability Derivatives
Derivatives Designated as Hedging Instruments
Heating oil	$ 9,171	1	$ (24,203)	1
Coal	3,172	2	(19,846)	2
Total	12,343		(44,049)
Derivatives Not Designated as Hedging Instruments
Coal held for trading purposes	122,801	2	(95,531)	2
Coal	6,593	2	(817)	2
Total	129,394		(96,348)
Total derivatives	141,737		(140,397)
Effect of counterparty netting	(118,329)		118,329
Total derivatives as classified in the balance sheet	$ 23,408		$ (22,068)

Location in the Balance Sheet
1 - Accrued expenses and other current liabilities ($15,032)
2 - Coal derivative assets ($23,408) and Coal derivative liabilities ($7,036)

The Company had a current liability for the obligation to return cash collateral of $0.1 million at June 30, 2009 and had a current asset for the right to reclaim cash collateral of $6.6 million at December 31, 2008. These amounts are not included with the derivatives presented in the table above.

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

Three Months Ended June 30, 2009
(in thousands)
	Gain on Derivatives		Hedged Items in		Loss on Hedged Items
Derivatives used in	Used in Fair Value		Fair Value Hedge		In Fair Value Hedge
Fair Value Hedging Relationships	Hedge Relationships		Relationships		Relationships
Coal	$ 1,604	1	Firm commitments		$ (1,604)	1

					Gain (Loss)
					Recognized in
			Losses		Income (Ineffective
	Gain (Loss)		Reclassified from		Portion and Amount
Derivatives used in	Recognized in OCI		OCI into Income		Excluded from
Cash Flow Hedging Relationships	(Effective Portion)		(Effective Portion)		Effectiveness Testing)
Heating oil	$ 11,604		$ (14,367)	2	$ —
Coal sales	374		—	1	—
Coal purchases	(570)		(5,440)	2	—
Totals	$ 11,408		$ (19,807)		$ —

Derivatives Not Designated as
Hedging Instruments	Gain
Coal	$ 507	3
Location in Statement of Income:
1-Coal sales
2-Cost of coal sales
3-Change in fair value of coal derivatives and coal trading activities, net

During the three months ended June 30, 2009, the Company recognized net unrealized and realized gains related to its trading portfolio (including derivative and non-derivative contracts) of $6.0 million as included in the caption “Change in fair value of coal derivatives and coal trading activities, net” in the accompanying condensed consolidated statement of income. These gains are not included in the above table.

Six Months Ended June 30, 2009
(in thousands)
	Loss on Derivatives		Hedged Items in		Gain on Hedged Items
Derivatives used in	Used in Fair Value		Fair Value Hedge		In Fair Value Hedge
Fair Value Hedging Relationships	Hedge Relationships		Relationships		Relationships
Coal	$ (1,584)	1	Firm commitments		$ 1,584	1

					Gain (Loss)
					Recognized in
			Losses		Income (Ineffective
	Gain (Loss)		Reclassified from		Portion and Amount
Derivatives used in	Recognized in OCI		OCI into Income		Excluded from
Cash Flow Hedging Relationships	(Effective Portion)		(Effective Portion)		Effectiveness Testing)
Heating oil	$ 8,739		$ (26,584)	2	$ —
Coal sales	(1,316)		(2,984)	1	—
Coal purchases	(4,502)		(5,440)	2	—
Totals	$ 2,921		$ (35,008)		$ —

Derivatives Not Designated as
Hedging Instruments	Gain
Coal	$ 688	3
Location in Statement of Income:
1-Coal sales
2-Cost of coal sales
3-Change in fair value of coal derivatives and coal trading activities, net

During the six months ended June 30, 2009, the Company recognized net unrealized and realized gains related to its trading portfolio (including derivative and non-derivative contracts) of $6.3 million as included in the caption “Change in fair value of coal derivatives and coal trading activities, net” in the accompanying condensed consolidated statement of income. These gains are not included in the above table.

During the next twelve months, based on fair values at June 30, 2009, losses on derivative contracts designated as hedge instruments in cash flow hedges of approximately $29.1 million are expected to be reclassified from other comprehensive income into earnings.

Stock-Based Compensation	6 Months Ended
Stock-Based Compensation	Jun. 30, 2009
Stock-Based Compensation
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	<div> <p class="MsoNormal" align="left" style= "margin-bottom:6.0pt;text-align:left; mso-pagination:none;mso-outline-level:1;mso-layout-grid-align:none;text-autospace: none"> <a name="_AUCb46c29e203e2486bba00fde7d2edd842"><b style= "mso-bidi-font-weight: normal">6<span style= "mso-bidi-font-weight:bold">.<span style= "mso-spacerun:yes"> </span> Stock-Based Compensation</span></b></a> </p> <p class="MsoNormal" align="left" style= "margin-bottom:6.0pt;text-align:left; text-indent:.25in;mso-pagination:none;mso-layout-grid-align:none;text-autospace: none"> <span>During the six months ended June 30, 2009, the Company granted options to purchase approximately 1.0 million shares of common stock with a weighted average exercise price of $14.06 per share and a weighted average grant-date fair value of $6.62 per share.<span style="mso-spacerun:yes"> </span> The options’ fair value was determined using the Black-Scholes option pricing model, using a weighted average risk-free rate of 1.75%, a weighted average dividend yield of 2.56% and a weighted average volatility of 69.32%.<span style= "mso-spacerun:yes"> </span> The options vest ratably over four years.<span style="mso-spacerun:yes"> </span> <span style= "mso-spacerun:yes"> </span>The options provide for the continuation of vesting for retirement-eligible 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 part or all of the award.<span style= "mso-spacerun:yes"> </span> The Company also granted 35,000 shares of restricted stock during the six months ended June 30, 2009 at a weighted average grant-date fair value of $14.05 per share. The restricted stock vests in three to four years.<span style="mso-spacerun:yes"> </span></span> </p> <p class="MsoNormal" align="left" style= "margin-bottom:6.0pt;text-align:left; text-indent:.25in;mso-pagination:none;mso-layout-grid-align:none;text-autospace: none"> <span>The Company recognized stock-based compensation expense from all plans of $3.4 million and $3.3 million for the three months ended June 30, 2009 and 2008, respectively, and $6.9 million and $8.0 million for the six months ended June 30, 2009, and 2008, respectively. This expense is primarily included in selling, general and administrative expenses in the accompanying condensed consolidated statements of income.</span> </p> <style> /<![CDATA[/ <!-- /* Style Definitions / p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0in; margin-bottom:.0001pt; text-align:justify; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";} p.Char, li.Char, div.Char {mso-style-name:" Char"; mso-style-link:"Default Paragraph Font"; margin-top:0in; margin-right:0in; margin-bottom:12.0pt; margin-left:0in; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";} @page Section1 {size:8.5in 11.0in; margin:1.0in 1.25in 1.0in 1.25in; mso-header-margin:.5in; mso-footer-margin:.5in; mso-paper-source:0;} div.Section1 {page:Section1;} --> / Style Definitions / table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} /]]>*/ </style> </div>

Inventories

6 Months Ended

Jun. 30, 2009

Inventories

Inventory Disclosure [Text Block]

7. Inventories

Inventories consist of the following:

	June 30,	December 31,
	2009	2008
	(In thousands)
Coal............................................................................................................................................	$ 106,332	$ 64,683
Repair parts and supplies, net of allowance........................................................................	134,496	126,885
	$ 240,828	$ 191,568

The repair parts and supplies are stated net of an allowance for slow-moving and obsolete inventories of $12.9 million at June 30, 2009, and $12.7 million at December 31, 2008.

Debt

6 Months Ended

Jun. 30, 2009

Debt

Debt Disclosure [Text Block]

8. Debt

	June 30,	December 31,
	2009	2008
	(In thousands)
Commercial paper...................................................................................................................	$ 38,744	$ 65,671
Indebtedness to banks under credit facilities...................................................................	434,872	273,597
6.75% senior notes ($950.0 million face value) due July 1, 2013.....................................	955,465	956,148
Other........................................................................................................................................	7,234	16,997
	1,436,315	1,312,413
Less current maturities of debt and short-term borrowings............................................	195,522	213,465
Long-term debt.......................................................................................................................	$ 1,240,793	$ 1,098,948

The current maturities of debt include 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. The Company had availability of $425.0 million under its credit facilities at June 30, 2009.

On March 6, 2009, the Company entered into an amendment (the “Credit Amendment”) to its $800.0 million secured revolving credit facility. The Credit Amendment amended certain covenants to make them less restrictive, including those related to lien creation, restricted payments and subsidiary guarantees of debt, in addition to an increase in the maximum leverage ratio, as defined, that the Company must maintain. In connection with these changes, the borrowing pricing grid was increased by 200 basis points and the rate on the unused portion of the facility was increased to 50 basis points. As of June 30, 2009 and December 31, 2008, the Company had $375.0 million and $205.0 million of borrowings outstanding under the revolving credit facility, respectively. At June 30, 2009, the Company had availability of $425.0 million under the revolving credit facility.

On March 31, 2009, the Company entered into an amendment to its accounts receivable securitization program revising certain terms to strengthen the credit quality of the pool of receivables and increasing the interest rate. The credit facility supporting the borrowings under the program was also renewed and now expires March 31, 2010. The size of the program continues to allow for aggregate borrowings and letters of credit of up to $175.0 million, as limited by eligible accounts receivable. The Company had borrowings under the program of $59.9 million at June 30, 2009 and $68.6 million at December 31, 2008. The Company also had letters of credit outstanding under the securitization program of $60.5 million as of June 30, 2009. At June 30, 2009, the Company had no availability under the accounts receivable securitization program.

Economic conditions have impacted the Company’s ability to issue commercial paper up to the $100.0 million maximum aggregate principal amount of the program. The commercial paper placement program is supported by a line of credit that has been renewed and expires on April 30, 2010.

At June 30, 2009 and December 31, 2008, the fair value of the Company’s senior notes and other long-term debt, including amounts classified as current, was $1,347.7 million and $1,178.0 million, respectively.

Taxes	6 Months Ended
Taxes	Jun. 30, 2009
Taxes
Unusual or Infrequent Items Disclosure [Text Block]	9. Taxes As part of the Emergency Economic Stabilization Act enacted on October 3, 2008, the Company filed for black lung excise tax refunds on taxes paid on export sales subsequent to October 1, 1990, along with interest computed at statutory rates. The Company recognized refunds of $11.0 million, plus interest of $10.3 million, in the fourth quarter of 2008. The Internal Revenue Service has approved the Company’s claim for refund and the Company recorded income of $6.8 million during the six months ended June 30, 2009, to adjust the estimated amount to be received, of which $6.1 million is reflected in the caption interest income in the accompanying condensed consolidated income statement, with the remainder in cost of coal sales. As of June 30, 2009 the Company has received all of the refunds recognized.

Workers' Compensation Expense

6 Months Ended

Jun. 30, 2009

Workers' Compensation Expense

Workers' Compensation Expense

10. Workers’ Compensation Expense

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

	Three Months Ended June 30		Six Months Ended June 30
	2009	2008	2009	2008
	(In thousands)
Self-insured occupational disease benefits:
Service cost..........................................................	$ 145	$ 325	$ 265	$ 650
Interest cost.........................................................	167	275	279	550
Net amortization...................................................	(469)	(450)	(1,440)	(900)
Total occupational disease..................................	(157)	150	(896)	300
Traumatic injury claims and assessments.........	2,047	2,062	3,552	5,260
Total workers’ compensation expense...............	$ 1,890	$ 2,212	$ 2,656	$ 5,560

Employee Benefit Plans

6 Months Ended

Jun. 30, 2009

Employee Benefit Plans

Pension and Other Postretirement Benefits Disclosure [Text Block]

11. Employee Benefit Plans

The following table details the components of pension benefit costs:

	Three Months Ended June 30		Six Months Ended June 30
	2009	2008	2009	2008
	(In thousands)
Service cost...........................................................................	$ 3,493	$ 3,150	$ 6,722	$ 6,300
Interest cost..........................................................................	4,303	3,675	7,962	7,350
Expected return on plan assets..........................................	(4,377)	(4,600)	(8,860)	(9,200)
Amortization of prior service cost.....................................	150	(50)	97	(100)
Amortization of other actuarial gains and losses............	1,180	625	1,983	1,250
Curtailments..........................................................................	586	—	586	—
	$ 5,335	$ 2,800	$ 8,490	$ 5,600

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

	Three Months Ended June 30		Six Months Ended June 30
	2009	2008	2009	2008
	(In thousands)
Service cost...........................................................................	$ 897	$ 668	$ 1,631	$ 1,468
Interest cost..........................................................................	1,088	883	2,017	1,858
Amortization of prior service cost.....................................	1,026	879	1,890	1,729
Amortization of other actuarial gains and losses............	(795)	(1,047)	(1,706)	(1,822)
	$ 2,216	$ 1,383	$ 3,832	$ 3,233

Comprehensive Income	6 Months Ended
Comprehensive Income	Jun. 30, 2009
Comprehensive Income
Comprehensive Income Note [Text Block]	<div> <p class="MsoNormal" align="left" style= "margin-bottom:6.0pt;text-align:left; mso-pagination:none;mso-outline-level:1;mso-layout-grid-align:none;text-autospace: none"> <a name= "_AUCabf32e28323e4afb91a54aef485a57f8"><b>12.<span style= "mso-spacerun:yes"> </span> Comprehensive Income</b></a> </p> <p class="MsoNormal" align="left" style= "margin-bottom:6.0pt;text-align:left; text-indent:.25in;mso-pagination:none;mso-layout-grid-align:none;text-autospace: none"> <span>Comprehensive income consists of net income and other comprehensive income.<span style="mso-spacerun:yes"> </span> Other comprehensive income items are transactions recorded in stockholders’ equity during the year, excluding net income and transactions with stockholders.</span> </p> <p class="MsoNormal" style= "margin-bottom:6.0pt;text-indent:.25in;mso-layout-grid-align: none;text-autospace:none"> <span>The following table presents the components of comprehensive income:</span> </p> <table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style= "border-collapse:collapse;mso-table-layout-alt:fixed;mso-padding-alt: 0in 5.4pt 0in 5.4pt"> <tr style="mso-yfti-irow:0;mso-yfti-firstrow:yes"> <td width="331" valign="top" style= "width:3.45in;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal"> <span><span style= "font-size:8.0pt;color:black"> </span></span> </p> </td> <td width="162" colspan="2" valign="top" style= "width:121.5pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" align="center" style= "text-align:center;text-indent:.6pt"> <span><b><span style= "font-size:8.0pt;color:black">Three Months Ended</span></b></span> </p> <div style= "mso-element:para-border-div;border:none;border-bottom:solid windowtext 1.0pt; mso-border-bottom-alt:solid windowtext .5pt;padding:0in 0in 1.0pt 0in"> <p class="MsoNormal" align="center" style= "text-align:center;text-indent:.6pt; border:none;mso-border-bottom-alt:solid windowtext .5pt;padding:0in; mso-padding-alt:0in 0in 1.0pt 0in"> <span><b><span style="font-size:8.0pt;color:black">June 30</span></b></span> </p> </div> </td> <td width="162" colspan="2" valign="top" style= "width:121.5pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" align="center" style= "text-align:center;text-indent:.6pt"> <span><b><span style="font-size:8.0pt;color:black">Six Months Ended</span></b></span> </p> <div style= "mso-element:para-border-div;border:none;border-bottom:solid windowtext 1.0pt; mso-border-bottom-alt:solid windowtext .5pt;padding:0in 0in 1.0pt 0in"> <p class="MsoNormal" align="center" style= "text-align:center;text-indent:.6pt; border:none;mso-border-bottom-alt:solid windowtext .5pt;padding:0in; mso-padding-alt:0in 0in 1.0pt 0in"> <span><b><span style="font-size:8.0pt;color:black">June 30</span></b></span> </p> </div> </td> </tr> <tr style="mso-yfti-irow:1"> <td width="331" valign="top" style= "width:3.45in;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal"> <span><span style= "font-size:8.0pt;color:black"> </span></span> </p> </td> <td width="84" valign="top" style= "width:63.0pt;padding:0in 5.4pt 0in 5.4pt"> <div style= "mso-element:para-border-div;border:none;border-bottom:solid windowtext 1.0pt; mso-border-bottom-alt:solid windowtext .5pt;padding:0in 0in 1.0pt 0in"> <p class="MsoNormal" align="center" style= "text-align:center;text-indent:.6pt; border:none;mso-border-bottom-alt:solid windowtext .5pt;padding:0in; mso-padding-alt:0in 0in 1.0pt 0in"> <span><b><span style= "font-size:8.0pt;color:black">2009</span></b></span> </p> </div> </td> <td width="78" valign="top" style= "width:58.5pt;padding:0in 5.4pt 0in 5.4pt"> <div style= "mso-element:para-border-div;border:none;border-bottom:solid windowtext 1.0pt; mso-border-bottom-alt:solid windowtext .5pt;padding:0in 0in 1.0pt 0in"> <p class="MsoNormal" align="center" style= "text-align:center;text-indent:.6pt; border:none;mso-border-bottom-alt:solid windowtext .5pt;padding:0in; mso-padding-alt:0in 0in 1.0pt 0in"> <span><b><span style= "font-size:8.0pt;color:black">2008</span></b></span> </p> </div> </td> <td width="78" valign="top" style= "width:58.5pt;padding:0in 5.4pt 0in 5.4pt"> <div style= "mso-element:para-border-div;border:none;border-bottom:solid windowtext 1.0pt; mso-border-bottom-alt:solid windowtext .5pt;padding:0in 0in 1.0pt 0in"> <p class="MsoNormal" align="center" style= "text-align:center;text-indent:.6pt; border:none;mso-border-bottom-alt:solid windowtext .5pt;padding:0in; mso-padding-alt:0in 0in 1.0pt 0in"> <span><b><span style= "font-size:8.0pt;color:black">2009</span></b></span> </p> </div> </td> <td width="84" valign="top" style= "width:63.0pt;padding:0in 5.4pt 0in 5.4pt"> <div style= "mso-element:para-border-div;border:none;border-bottom:solid windowtext 1.0pt; mso-border-bottom-alt:solid windowtext .5pt;padding:0in 0in 1.0pt 0in"> <p class="MsoNormal" align="center" style= "text-align:center;text-indent:.6pt; border:none;mso-border-bottom-alt:solid windowtext .5pt;padding:0in; mso-padding-alt:0in 0in 1.0pt 0in"> <span><b><span style= "font-size:8.0pt;color:black">2008</span></b></span> </p> </div> </td> </tr> <tr style="mso-yfti-irow:2"> <td width="331" valign="top" style= "width:3.45in;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:right dotted 337.5pt"> <span><span style="color:black"> </span></span> </p> </td> <td width="324" colspan="4" valign="top" style= "width:243.0pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" align="center" style= "text-align:center"> <span><b style= "mso-bidi-font-weight:normal"><span style= "font-size:8.0pt;color:black">(In thousands)</span></b></span> </p> </td> </tr> <tr style="mso-yfti-irow:3"> <td width="331" valign="top" style= "width:3.45in;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:right dotted 238.5pt"> <span><a name="_Hlk235698004"><span style= "color:black">Net income (loss)<span style= "mso-tab-count:1 dotted">.........................................................................</span></span></a></span> </p> </td> <td width="84" valign="top" style= "width:63.0pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 48.6pt"> <span><span>$<span style= "mso-tab-count:1"> </span> (15,161)</span></span> </p> </td> <td width="78" valign="top" style= "width:58.5pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 44.1pt"> <span><span>$<span style="mso-tab-count:1"> </span> 113,271</span></span> </p> </td> <td width="78" valign="top" style= "width:58.5pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 44.1pt"> <span><span>$<span style= "mso-tab-count:1"> </span> 15,411</span></span> </p> </td> <td width="84" valign="top" style= "width:63.0pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 48.6pt"> <span><span>$<span style= "mso-tab-count:1"> </span> 194,692</span></span> </p> </td> </tr> <tr style="mso-yfti-irow:4"> <td width="331" valign="top" style= "width:3.45in;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:right dotted 222.0pt 238.5pt"> <span><span><span style="color:black">Other comprehensive income, net of income taxes:</span></span></span> </p> </td> <td width="84" valign="top" style= "width:63.0pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 48.6pt"> <span><span> </span></span> </p> </td> <td width="78" valign="top" style= "width:58.5pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 44.1pt"> <span><span> </span></span> </p> </td> <td width="78" valign="top" style= "width:58.5pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 44.1pt"> <span><span> </span></span> </p> </td> <td width="84" valign="top" style= "width:63.0pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 48.6pt"> <span><span> </span></span> </p> </td> </tr> <tr style="mso-yfti-irow:5"> <td width="331" valign="top" style= "width:3.45in;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "margin-left:13.5pt;tab-stops:right dotted 238.5pt"> <span><span><span style="color:black">Pension, postretirement and other post-employment benefits, net of reclassifications into net income<span style= "mso-tab-count:1 dotted">..............</span></span></span></span> </p> </td> <td width="84" valign="top" style= "width:63.0pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 48.6pt"> <span><span> </span></span> </p> <p class="MsoNormal" style= "tab-stops:.05in decimal 48.6pt"> <span><span><span style= "mso-tab-count:2"> </span> 1,073</span></span> </p> </td> <td width="78" valign="top" style= "width:58.5pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 44.1pt"> <span><span> </span></span> </p> <p class="MsoNormal" style= "tab-stops:.05in decimal 44.1pt"> <span><span><span style= "mso-tab-count:2"> </span> (45)</span></span> </p> </td> <td width="78" valign="top" style= "width:58.5pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 44.1pt"> <span><span> </span></span> </p> <p class="MsoNormal" style= "tab-stops:.05in decimal 44.1pt"> <span><span><span style= "mso-tab-count:2"> </span> 902</span></span> </p> </td> <td width="84" valign="top" style= "width:63.0pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 48.6pt"> <span><span> </span></span> </p> <p class="MsoNormal" style= "tab-stops:.05in decimal 48.6pt"> <span><span><span style= "mso-tab-count:2"> </span> 100</span></span> </p> </td> </tr> <tr style="mso-yfti-irow:6"> <td width="331" valign="top" style= "width:3.45in;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "margin-left:13.5pt;tab-stops:right dotted 238.5pt"> <span><span><span style= "color:black">Available-for-sale securities, net of reclassifications into net income<span style= "mso-tab-count: 1 dotted">...............................................................................</span></span></span></span> </p> </td> <td width="84" valign="bottom" style= "width:63.0pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 48.6pt"> <span><span><span style= "mso-tab-count:2"> </span> (56)</span></span> </p> </td> <td width="78" valign="bottom" style= "width:58.5pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 44.1pt"> <span><span><span style= "mso-tab-count:2"> </span> 119</span></span> </p> </td> <td width="78" valign="bottom" style= "width:58.5pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 44.1pt"> <span><span><span style= "mso-tab-count:2"> </span> (94)</span></span> </p> </td> <td width="84" valign="bottom" style= "width:63.0pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 48.6pt"> <span><span><span style= "mso-tab-count:2"> </span> 1,175</span></span> </p> </td> </tr> <tr style="mso-yfti-irow:7"> <td width="331" valign="top" style= "width:3.45in;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "margin-left:13.5pt;tab-stops:right dotted 238.5pt"> <span><span><span style="color:black">Unrealized gains and losses on derivatives:</span></span></span> </p> </td> <td width="84" valign="bottom" style= "width:63.0pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 48.6pt"> <span><span><span style= "mso-tab-count:2"> </span></span></span> </p> </td> <td width="78" valign="bottom" style= "width:58.5pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 44.1pt"> <span><span><span style= "mso-tab-count:2"> </span></span></span> </p> </td> <td width="78" valign="bottom" style= "width:58.5pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 44.1pt"> <span><span><span style= "mso-tab-count:2"> </span></span></span> </p> </td> <td width="84" valign="bottom" style= "width:63.0pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 48.6pt"> <span><span><span style= "mso-tab-count:2"> </span></span></span> </p> </td> </tr> <tr style="mso-yfti-irow:8"> <td width="331" valign="top" style= "width:3.45in;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "text-indent:27.0pt;tab-stops:right dotted 238.5pt"> <span><span><span style="color:black">Unrealized gains on derivatives<span style= "mso-tab-count:1 dotted">.....................................</span></span></span></span> </p> </td> <td width="84" valign="top" style= "width:63.0pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 48.6pt"> <span><span><span style= "mso-tab-count:2"> </span> 7,301</span></span> </p> </td> <td width="78" valign="top" style= "width:58.5pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 44.1pt"> <span><span><span style= "mso-tab-count:2"> </span> 5,577</span></span> </p> </td> <td width="78" valign="top" style= "width:58.5pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 44.1pt"> <span><span><span style= "mso-tab-count:2"> </span> 1,870</span></span> </p> </td> <td width="84" valign="top" style= "width:63.0pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "tab-stops:.05in decimal 48.6pt"> <span><span><span style= "mso-tab-count:2"> </span> 9,894</span></span> </p> </td> </tr> <tr style="mso-yfti-irow:9"> <td width="331" valign="top" style= "width:3.45in;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "margin-top:0in;margin-right:0in;margin-bottom:6.0pt; margin-left:.25in;text-indent:9.0pt;tab-stops:right dotted 238.5pt"> <span><span><span style="color:black">Reclassifications of losses into net income<span style= "mso-tab-count:1 dotted">.................</span></span></span></span> </p> </td> <td width="84" valign="top" style= "width:63.0pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "margin-bottom:6.0pt;tab-stops:.05in decimal 48.6pt"> <span><span><u><span style= "mso-tab-count:2"> </span> 12,678</u></span></span> </p> </td> <td width="78" valign="top" style= "width:58.5pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "margin-bottom:6.0pt;tab-stops:.05in decimal 44.1pt"> <span><span><u><span style= "mso-tab-count:2"> </span> 2,218</u></span></span> </p> </td> <td width="78" valign="top" style= "width:58.5pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "margin-bottom:6.0pt;tab-stops:.05in decimal 44.1pt"> <span><span><u><span style= "mso-tab-count:2"> </span> 22,405</u></span></span> </p> </td> <td width="84" valign="top" style= "width:63.0pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "margin-bottom:6.0pt;tab-stops:.05in decimal 48.6pt"> <span><span><u><span style= "mso-tab-count:2"> </span> 633</u></span></span> </p> </td> </tr> <tr style="mso-yfti-irow:10;mso-yfti-lastrow:yes"> <td width="331" valign="top" style= "width:3.45in;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "margin-top:0in;margin-right:0in;margin-bottom:6.0pt; margin-left:.25in;text-indent:-.25in;tab-stops:right dotted 238.5pt"> <span><span><span style="color:black">Total comprehensive income<span style= "mso-tab-count:1 dotted">.....................................................</span></span></span></span> </p> </td> <td width="84" valign="top" style= "width:63.0pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "margin-bottom:6.0pt;tab-stops:.05in decimal 48.6pt"> <span><span><u style= "text-underline:double">$<span style= "mso-tab-count:1"> </span> 5,835</u></span></span> </p> </td> <td width="78" valign="top" style= "width:58.5pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "margin-bottom:6.0pt;tab-stops:.05in decimal 44.1pt"> <span><span><u style= "text-underline:double">$<span style= "mso-tab-count:1"> </span> 121,140</u></span></span> </p> </td> <td width="78" valign="top" style= "width:58.5pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "margin-bottom:6.0pt;tab-stops:.05in decimal 44.1pt"> <span><span><u style= "text-underline:double">$<span style= "mso-tab-count:1"> </span> 40,494</u></span></span> </p> </td> <td width="84" valign="top" style= "width:63.0pt;padding:0in 5.4pt 0in 5.4pt"> <p class="MsoNormal" style= "margin-bottom:6.0pt;tab-stops:.05in decimal 48.6pt"> <span><span><u style= "text-underline:double">$<span style= "mso-tab-count:1"> </span> 206,494</u></span></span> </p> </td> </tr> </table> <style> /<![CDATA[/ <!-- /* Style Definitions / p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0in; margin-bottom:.0001pt; text-align:justify; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times 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Earnings Per Share

6 Months Ended

Jun. 30, 2009

Earnings Per Share

Earnings Per Share, Policy [Text Block]

13. Earnings per Share

The following table provides the basis for earnings per share calculations by presenting the income available to common stockholders of the Company and by reconciling basic and diluted weighted average shares outstanding:

	Three Months Ended June 30		Six Months Ended June 30
	2009	2008	2009	2008
	(In thousands)
Income (loss) for basic earnings per share calculation:
Net income (loss) allocated to common stockholders.......	$ (15,109)	$ 112,871	$ 15,436	$ 193,928


Weighted average shares outstanding:
Basic weighted average shares outstanding ......................	142,815	144,120	142,802	143,809
Effect of common stock equivalents under incentive plans	—	929	122	945
Effect of common stock equivalents arising from Preferred Stock.......................................................................	—	—	—	69

Diluted weighted average shares outstanding ..................	142,815	145,049	142,924	144,823

The effect of options to purchase 1.7 million shares of common stock were excluded from the calculation of diluted weighted average shares outstanding for both the three and six months ended June 30, 2009 because the exercise price of these options exceeded the average market price of the Company’s common stock for these periods. The additional dilutive effect of options, restricted stock and restricted stock units totaling 2.5 million shares of common stock were excluded from the calculation of diluted weighted average shares outstanding for the three months ended June 30, 2009 because of the net loss for the quarter.

Guarantees	6 Months Ended
Guarantees	Jun. 30, 2009
Guarantees
Schedule of Guarantee Obligations [Text Block]	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. 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. At June 30, 2009, the Company had approximately $91.6 million of surety bonds related to properties sold to Magnum. As a result of Magnum’s purchase by Patriot Coal Corporation, Magnum will be required to post letters of credit in the Company’s favor for the full amount of the reclamation obligation on or before February 2011. 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. In addition, certain contracts were assigned to Magnum, but the Company has guaranteed Magnum’s performance under the contracts. The longest of the coal supply contracts extends to the year 2017. If Magnum is unable to supply the coal for these coal sales contracts then the Company would be required to purchase coal on the open market or supply contracts from its existing operations. At market prices effective at June 30, 2009, the cost of purchasing 13.6 million tons of coal to supply the contracts that have not been assigned over their duration would exceed the sales price under the contracts by approximately $208.7 million, and the cost of purchasing 3.3 million tons of coal to supply the assigned and guaranteed contracts over their duration would exceed the sales price under the contracts by approximately $62.8 million. The Company has also guaranteed Magnum’s performance under certain operating leases, the longest of which extends through 2011. If the Company were required to perform under its guarantees of the operating lease agreements, it would be required to make $4.4 million of lease payments. As the Company does not believe that it is probable that it would have to purchase replacement coal or fulfill its obligations under the lease guarantees, no losses have been recorded in the consolidated financial statements as of June 30, 2009. 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 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 was $46.9 million at June 30, 2009, which is not recorded as a liability in the Company’s 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	6 Months Ended
Contingencies	Jun. 30, 2009
Contingencies
Commitments and Contingencies Disclosure [Text Block]	15. Contingencies 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 estimable. After conferring with counsel, it is the opinion of management that the ultimate resolution of pending claims will not have a material adverse effect on the consolidated financial condition, results of operations or liquidity of the Company.

Segment Information

6 Months Ended

Jun. 30, 2009

Segment Information

Segment Reporting Disclosure [Text Block]

16. Segment Information

The Company has three reportable business segments, which are based on the major low-sulfur coal 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 generally consistent within 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; and the Central Appalachia (CAPP) segment, with operations in southern West Virginia, eastern Kentucky and Virginia.

Operating segment results for the three and six months ended June 30, 2009 and 2008 are presented below. Results for the operating segments include all direct costs of mining. 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.

	PRB	WBIT	CAPP	Corporate, Other and Eliminations	Consolidated
	(In thousands)
Three months ended June 30, 2009
Coal sales....................................................	$ 268,558	$ 112,081	$ 173,973	$ —	$ 554,612
Income (loss) from operations.................	18,093	(4,457)	12,282	(18,609)	7,309
Depreciation, depletion and amortization	27,695	18,879	21,416	487	68,477
Capital expenditures..................................	8,092	27,412	17,548	1,624	54,676

Three months ended June 30, 2008
Coal sales....................................................	$ 284,347	$ 194,576	$ 306,194	$ —	$ 785,117
Income from operations............................	24,720	44,127	79,503	20,874	169,224
Depreciation, depletion and amortization	28,501	19,843	23,148	461	71,953
Capital expenditures..................................	38,385	34,498	17,987	719	91,589

Six months ended June 30, 2009
Coal sales....................................................	$ 579,800	$ 234,638	$ 421,214	$ —	$ 1,235,652
Income (loss) from operations.................	49,307	(12,112)	55,833	(47,147)	45,881
Total assets................................................	1,880,823	2,070,520	1,141,956	(1,064,302)	4,028,997
Depreciation, depletion and amortization.	57,162	38,363	45,050	943	141,518
Capital expenditures..................................	41,871	43,506	30,529	130,656	246,562

	PRB	WBIT	CAPP	Corporate, Other and Eliminations	Consolidated

Six months ended June 30, 2008
Coal sales....................................................	$ 573,348	$ 356,629	$ 554,490	$ —	$ 1,484,467
Income from operations............................	57,205	78,188	129,085	21,470	285,948
Total assets................................................	1,763,537	2,032,949	904,545	(752,357)	3,948,674
Depreciation, depletion and amortization.	57,821	41,301	44,952	921	144,995
Capital expenditures..................................	76,562	94,818	40,569	124,131	336,080

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

	Three Months Ended June 30		Six Months Ended June 30
	2009	2008	2009	2008
	(In thousands)
Income from operations..............................................................	$ 7,309	$ 169,224	$ 45,881	$ 285,948
Interest expense...........................................................................	(20,657)	(18,721)	(40,675)	(39,209)
Interest income.............................................................................	417	468	6,885	893
Income (loss) before income taxes............................................	$ (12,931)	$ 150,971	$ 12,091	$ 247,632

Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2009
Subsequent Events
Schedule of Subsequent Events [Text Block]	17. Subsequent Events The Company’s management evaluated the period from June 30, 2009 to August 7, 2009 for items requiring recognition or disclosure in the financial statements. No events that require recognition in the financial statements were identified. On July 31, 2009, the Company sold 17 million shares of its common stock at a public offering price of $17.50 per share and issued $600 million in aggregate principal amount of 8.750% senior unsecured notes due 2016 at an initial issue price of 97.464%. On August 6, 2009, the Company issued an additional 2.55 million shares of its common stock under the same terms and conditions to cover over-allotments. The Company plans to use the net proceeds from these offerings to finance the acquisition of the Jacobs Ranch mining complex, as discussed in Note 3, “Business Combinations”. There were no other events occurring during the evaluation period that require disclosure.

Document Information	6 Months Ended
Document Information	Jun. 30, 2009
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2009

Entity Information - USD ($)	6 Months Ended
Entity Information - USD ($)	Jun. 30, 2009	Jun. 30, 2008
Entity Information [Line Items]
Entity Registrant Name	Arch Coal, Inc.
Entity Central Index Key	0001037676
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float		$ 10,800,000,000
Entity Common Stock, Shares Outstanding	162,471,165