Income Taxes - Continuing and Discontinuing Tax (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Contingency [Line Items]
Continuing operations	$ 2,994	$ (1,333)	$ 1,883
Discontinued operations	(289)	(166)	(2,085)
Total income tax benefit	$ 2,705	$ (1,499)	$ (202)