Consolidated Statement of Changes in Stockholder's Equity (USD $) In Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Beginning Balance at Dec. 31, 2008	$ 577,478	$ 394	$ (860)	$ 1,257,633	$ (764,688)	$ 84,912	$ 87
Net income (loss)	(218,271)				(218,298)		27
Adjustment for fair value accounting of derivatives, net of tax	(100,292)					(100,292)
Acquisition of non-controlling interest	(41)			73			(114)
Exercise of stock options and vesting of restricted stock	(514)			(514)
Amortization of stock compensation expense	8,845			8,845
Tax deficit from stock option exercises and restricted stock vesting	(1,647)			(1,647)
Stock repurchase and cancellation	(346)			(346)
Issuance of common stock	60,447	81		60,366
Ending Balance at Dec. 31, 2009	325,659	475	(860)	1,324,410	(982,986)	(15,380)
Net income (loss)	96,429				96,429
Adjustment for fair value accounting of derivatives, net of tax	1,176					1,176
Exercise of stock options and vesting of restricted stock	(1,367)	3		(1,370)
Amortization of stock compensation expense	8,462			8,462
Tax deficit from stock option exercises and restricted stock vesting	(2)			(2)
Ending Balance at Dec. 31, 2010	430,357	478	(860)	1,331,500	(886,557)	(14,204)
Net income (loss)	194,332				194,332
Adjustment for fair value accounting of derivatives, net of tax	36,072					36,072
Exercise of stock options and vesting of restricted stock	(2,581)	3		(2,584)
Amortization of stock compensation expense	8,914			8,914
Net tax benefit from stock option exercises and restricted stock vesting	735			735
Ending Balance at Dec. 31, 2011	$ 667,829	$ 481	$ (860)	$ 1,338,565	$ (692,225)	$ 21,868