Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Balance at January 1	$ 2,069	$ 1,877	$ 1,750
Changes in unrecognized tax benefits as a result of tax positions taken during a prior year	(140)	287	560
Changes in unrecognized tax benefits as a result of tax position taken during the current year	419	475	555
Decreases in unrecognized tax benefits relating to settlements with taxing authorities	0	0	(466)
Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations	(463)	(570)	(522)
Balance at December 31	$ 1,885	$ 2,069	$ 1,877