Consolidated Statements of Comprehensive Income (loss) (Unaudited) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Consolidated Statements of Comprehensive Income (loss) [Abstract]
Net income (loss)	$ 19,583	$ (23,079)	$ 22,788	$ (76,080)
Other comprehensive income (loss):
Change in fair value of derivatives, net of tax	(2,087)		(2,087)
Accumulated losses on derivatives reclassified to income, net of tax	4,003	9,941	8,683	20,903
Total other comprehensive income	1,916	9,941	6,596	20,903
Comprehensive income (loss)	$ 21,499	$ (13,138)	$ 29,384	$ (55,177)