Income Taxes - Current and Deferred Tax (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Disclosure [Abstract]
Current	$ 283	$ (639)	$ 4,692
Deferred	2,422	(860)	(4,894)
Total income tax benefit	$ 2,705	$ (1,499)	$ (202)