Income Taxes (Details 6) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 6,965	$ 7,102	$ 7,017
Tax positions taken during prior periods	0	0	240
Tax positions taken during the current period	0	215	17
Acquisition	2,528	0	0
Settlements with taxing authorities	(172)	(175)	0
Lapse of the applicable statute of limitations	0	(177)	(172)
Balance at December 31	9,321	6,965	7,102
The liability for unrecognized tax benefits included accrued interest	$ 0	$ 0	$ 39