Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of the beginning and ending uncertain tax positions
Gross unrecognized tax benefits, Beginning Balance	$ 2,526	$ 2,471
Increases in tax positions for prior years	152
Decreases in tax positions for prior years
Increases in tax positions for current year		55
Settlements
Lapse in statute of limitations
Gross unrecognized tax benefits, Ending Balance	$ 2,678	$ 2,526