Income Taxes (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Contingency [Line Items]
Balance at beginning of year	$ 0	$ 146	$ 2,921
Increase for tax positions related to prior years	0	0	0
Increase for tax positions related to the current year	0	0	0
Settlements and lapse of statutes of limitations	0	(146)	(2,745)
Reductions for tax positions of prior years	0	0	(30)
Balance at end of year	$ 0	$ 0	$ 146