Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
Balance, value at Dec. 31, 2008	$ 204,400	$ 9	$ 100,918	$ 21,340	$ 82,133
Balance, shares at Dec. 31, 2008		877,000
Net income (loss)	(144,318)			(144,318)
Unrealized loss on hedges, net of taxes	(51,683)				(51,683)
Reclassification adjustment for hedge (gains) losses included in net income (loss), net of taxes	(12,832)				(12,832)
Total comprehensive income (loss)	(208,833)
Balance, value at Dec. 31, 2009	(4,433)	9	100,918	(122,978)	17,618
Balance, shares at Dec. 31, 2009		877,000
Net income (loss)	33,713			33,713
Unrealized loss on hedges, net of taxes	(648)				(648)
Reclassification adjustment for hedge (gains) losses included in net income (loss), net of taxes	18,004				18,004
Total comprehensive income (loss)	51,069
Common stock issuance for cash, shares		475,043
Common stock issuance for cash, value	313,231	5	313,226
Restricted stock issuances, shares		51,346
Stock-based compensation	3,690		3,690
Balance, value at Dec. 31, 2010	363,557	14	417,834	(89,265)	34,974
Balance, shares at Dec. 31, 2010		1,403,389
Net income (loss)	42,048			42,048
Reclassification adjustment for hedge (gains) losses included in net income (loss), net of taxes	16,872	0	0	0	16,872
Total comprehensive income (loss)	58,920
Restricted stock issuances, shares		17,642
Stock-based compensation	4,137		4,137
Restricted stock forfeitures, shares		(2,295)
Restricted stock repurchased, shares		(528)
Modification of Time Vesting awards to liability plan	(2,640)		(2,640)
Time Vesting awards settled in restricted stock	39		39
Balance, value at Dec. 31, 2011	$ 424,013	$ 14	$ 419,370	$ (47,217)	$ 51,846
Balance, shares at Dec. 31, 2011		1,418,208