Income Taxes - Components of Income Tax Expense (Benefit) by Jurisdiction and by Classification (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
U.S. Federal
Current	$ (3,214)	$ (12,386)	$ 6,923
Deferred	(2,174)	6,736	4,754
Total	(5,388)	(5,650)	11,677
State and local
Current	220	847	77
Deferred	528	(1,544)	205
Total	748	(697)	282
Total Income Taxes
Current	(2,994)	(11,539)	7,000
Deferred	(1,646)	5,192	4,959
Total	$ (4,640)	$ (6,347)	$ 11,959