Acquisitions and Divestitures (Tables)

12 Months Ended

Dec. 31, 2011

Acquisitions and Divestitures [Abstract]

Allocation of total purchase price

Proved oil and gas properties.	$	208,680
Unevaluated oil and gas properties.		17,314
Asset retirement obligations.		(58,363	)
Total fair value of net assets.	$	167,631

Pro forma combined statement of operations data

	Year Ended December 31,
	2011		2010
	(Unaudited)
Revenues	$	1,007,376	$	799,461
Income from operations		392,054		243,387
Net income		242,118		141,763
Basic earnings per share	$	4.95	$	2.93
Diluted earnings per share	$	4.95	$	2.92