Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
United States federal and state income tax expense (benefit) from operations
Current	$ (5,922)	$ (3,295)	$ 958
Deferred	6,827	(99)	(1,663)
Change in valuation allowance	(64)	(1,169)	(1,377)
Total	$ 841	$ (3,394)	$ (2,082)