Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Movement in uncertain tax positions
Uncertain tax positions at the beginning of the period	$ 14,858	$ 36,097	$ 36,887
Gross increase - tax position in prior periods	1,287	679	1,493
Gross decrease - tax position in prior periods	(761)	(19,077)	(288)
Gross increase - current period tax position	18	17
Settlements	(891)	(2,201)	(125)
Lapse in statute of limitations	(287)	(541)	(756)
Foreign exchange	458	(116)	(1,114)
Uncertain tax positions at the end of the period	14,682	14,858	36,097
Interest and penalties included within uncertain tax positions	3,151
Impact of uncertain tax positions on effective tax rate, if recognized	$ 14,335