Income Taxes Schedule of Income before Tax, Domestic and Foreign (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Disclosure [Abstract]
Domestic	$ 55,537	$ 113,145	$ 10,686
Foreign	3,435	3,384	5,964
Income before income tax	$ 58,972	$ 116,529	$ 16,650