Consolidated Statements of Comprehensive Income (loss) (Unaudited) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statements of Comprehensive Income (loss) [Abstract]
Net income (loss)	$ 30,950	$ (1,019)	$ 53,738	$ (77,099)
Other comprehensive income (loss):
Change in fair value of derivatives, net of tax	(3,314)		(5,401)
Accumulated losses on derivatives reclassified to income, net of tax	3,384	7,382	12,067	28,285
Total other comprehensive income	70	7,382	6,666	28,285
Comprehensive income (loss)	$ 31,020	$ 6,363	$ 60,404	$ (48,814)