Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal	$ (29,202)	$ 20,752	$ 54,095
State and local	3,201	3,862	3,999
Total current	(26,001)	24,614	58,094
Deferred:
Federal	52,969	14,305	(16,692)
State and local	912	(204)	(299)
Total deferred	53,881	14,101	(16,991)
Total income tax expense	$ 27,880	$ 38,715	$ 41,103