Income Taxes (Details 6) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 7,102	$ 7,017	$ 7,611
Tax positions taken during prior periods	0	240	0
Tax positions taken during the current period	215	17	59
Settlements with taxing authorities	(175)	0	(320)
Lapse of the applicable statute of limitations	(177)	(172)	(333)
Balance at December 31	6,965	7,102	7,017
The liability for unrecognized tax benefits included accrued interest	$ 0	$ 39	$ 29