Comprehensive Income (Details 2) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Accumulated Other Comprehensive Income [Roll Forward]
Foreign Currency Translation Adjustment, Beginning Balance			$ 45,905
Foreign Currency Translation Adjustment, Current Period Change	(34,142)	20,479	(17,919)	8,287
Foreign Currency Translation Adjustment, Ending Balance	27,986		27,986
Defined Benefit Plans, Beginning Balance			22
Defined Benefit Plans, Current Period Change	41	35	(84)	309
Defined Benefit Plans, Ending Balance	(62)		(62)
Net Unrealized Losses on Cash Flow Hedges, Beginning Balance			(5,813)
Net Unrealized Losses on Cash Flow Hedges, Ending Balance	(5,181)		(5,181)
Accumulated Other Comprehensive Income, Beginning Balance			40,114
Accumulated Other Comprehensive Income, Current Period Change			(17,371)
Accumulated Other Comprehensive Income, Ending Balance	22,743		22,743
Interest Rate Swap [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Net Unrealized Losses on Cash Flow Hedges, Current Period Change	$ 187	$ (755)	$ 632	$ (2,733)