Acquisitions (Tables)

12 Months Ended

Dec. 31, 2011

Acquisitions

Purchase consideration

Purchase consideration:
Cash	$	2,173,080
Fair value of shares of common stock issued		1,224,126
Fair value of stock options issued and warrants		34,765
Fair value of consideration transferred		3,431,971
Fair value of equity interest in Western Coal held before the acquisition		314,231
Total consideration	$	3,746,202

Fair value of assets acquired and liabilities assumed

	Preliminary September 30, 2011		Adjustments			Preliminary December 31, 2011		Recast Adjustments			Final
Fair value of assets acquired and liabilities assumed:
Cash and cash equivalents	$	34,065	$	—		$	34,065	$	—		$	34,065
Receivables		163,668		—			163,668		—			163,668
Inventories		122,012		(783	)		121,229		—			121,229
Other current assets		65,606		20,869			86,475		23			86,498
Mineral interests		4,399,000		(1,407,000	)		2,992,000		94,000			3,086,000
Property, plant and equipment		565,228		(4,334	)		560,894		(6,702	)		554,192
Goodwill		277,404		845,480			1,122,884		(57,844	)		1,065,040
Other long-term assets		54,150		—			54,150		—			54,150
Total assets		5,681,133		(545,768	)		5,135,365		29,477			5,164,842
Accounts payable and accrued liabilities		180,157		4,826			184,983		—			184,983
Other current liabilities		75,824		6,351			82,175		3,930			86,105
Deferred tax liability		1,576,896		(555,735	)		1,021,161		25,547			1,046,708
Other long-term liabilities		102,054		(1,210	)		100,844		—			100,844
Total liabilities		1,934,931		(545,768	)		1,389,163		29,477			1,418,640
Net assets acquired	$	3,746,202	$	—		$	3,746,202	$	—		$	3,746,202

Schedule of recast and previously reported condensed consolidated statement of operations

	Previously Reported		Recast Adjustments			As Recast
Depreciation and depletion	$	245,509	$	(14,828	)	$	230,681
Operating income		558,603		14,828			573,431
Income before income tax expense		479,995		14,828			494,823
Income tax expense		130,819		406			131,225
Net income		349,176		14,422			363,598
Net income per share:
Basic	$	5.79	$	0.24		$	6.03
Diluted	$	5.76	$	0.24		$	6.00

Schedule of recast and previously reported condensed consolidated statement of cash flows

	Previously Reported		Recast Adjustments			As Recast
Net Income	$	349,176	$	14,422		$	363,598
Adjustments to reconcile net income to net cash flows provided by (used in) operating activities:
Depreciation and depletion		245,509		(14,828	)		230,681
Deferred income tax credit		66,397		406			66,803

Revenue and earnings of the acquiree included in the Company's consolidated statements of operations

	For the year ended December 31, 2011 Recast
Revenues	$	846,682
Net income	$	74,960

Schedule of unaudited pro forma financial information

	For the years ended December 31,
	2011		2010
Revenues	$	2,795,566	$	2,358,040
Net income	$	418,419	$	342,693

Schedule of revenues and earnings from acquisition date

Fair value of assets acquired and liabilities assumed:
Receivables	$	5,439
Other current assets		340
Property, plant and equipment		210,323
Identifiable intangible asset		1,505
Total assets		217,607
Accounts payable & accrued liabilities		(4,282	)
Asset retirement obligations		(3,361	)
Total liabilities		(7,643	)
Net assets acquired	$	209,964