Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Income tax expense (benefit)
Continuing operations	$ 20,786	[1]	$ 20,302	[1]	$ 5,363	[1]
Discontinued operations	(597)		(735)		175
Income tax expense benefit continuing and discontinue operations	$ 20,189		$ 19,567		$ 5,538

[1] Restated