Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Unrecognized tax benefits for permanent and temporary book/tax differences for continuing operations, exclusive of interest
Balance at January 1	$ 9,237	$ 7,517	$ 7,623
Settlements for tax positions of prior years	(15,969)	0	(164)
Additions for tax positions of the current year	987	1,686	934
Additions for tax positions of prior years	7,837	62	18
Reductions for tax positions of prior years	(572)	(28)	(894)
Reductions for lapse of statute of limitations	(533)
Balance at December 31	$ 987	$ 9,237	$ 7,517