Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Components of income before income taxes
United States	$ (218,049)	$ 47,874	$ 73,130
Foreign	6,743	4,883	1,579
Income (loss) before income taxes	(211,306)	52,757	74,709
Current:
U.S. federal	(390)	11,028	11,852
State	1,343	5,891	2,593
Foreign	6,129	2,312	39
Total	7,082	19,231	14,484
Deferred:
U.S. federal	20,339	7,573	15,380
State	400	(264)	(457)
Foreign	(372)	(320)
Total	20,367	6,989	14,923
Provision for income taxes	$ 27,449	$ 26,220	$ 29,407

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