Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of unrecognized tax benefits
Balance as of January 1	$ 1,969	$ 2,944
Additions to tax provisions related to the current year	149	0
Additions to tax positions related to prior years	174	878
Reduction to tax positions related to prior years	(20)	0
Lapses on statutes of limitations	(455)	(1,853)
Settlements	(50)	0
Balance as of December 31	$ 1,767	$ 1,969