Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliations of unrecognized tax benefits
Unrecognized tax benefits, opening balance	$ 1,232	$ 1,902	$ 2,052
Gross increases - tax positions in prior period
Gross decreases - tax positions in prior period	(569)	(795)	(90)
Gross increases - current period tax positions	44	213	152
Settlements		(38)
Foreign currency translation	23	(8)	(16)
Lapse of statute of limitations	(441)	(42)	(196)
Unrecognized tax benefits, ending balance	$ 289	$ 1,232	$ 1,902