Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Consolidated Statements of Comprehensive Income [Abstract]
Net income (loss)	$ (53,232)	$ (1,758)	$ (70,558)	$ 1,419
Change in fair value of derivative instruments, accounted for as hedges, net of income taxes of ($1,049), ($330), ($597) and ($330), respectively	(1,772)	2,374	(1,008)	1,646
Comprehensive income (loss)	$ (55,004)	$ 616	$ (71,566)	$ 3,065