Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]
Net income (loss)	$ (132,079)	$ 10,548	$ 47,126
Change in fair value of derivatives, net of income tax (expense) benefit of $2,079, ($2,388), and $1,028, respectively	(3,510)	5,120	(2,857)
Comprehensive income (loss)	$ (135,589)	$ 15,668	$ 44,269