Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Accumulated Other Comprehensive Income [Roll Forward]
Foreign Currency Translation Adjustment, Beginning Balance	$ 42,394
Foreign Currency Translation Adjustment, Current Period Change	6,246	6,676
Foreign Currency Translation Adjustment, Ending Balance	48,640
Defined Benefit Plans, Beginning Balance	(20)
Defined Benefit Plans, Current Period Change	(409)	(171)
Defined Benefit Plans, Ending Balance	(429)
Net Unrealized Gain/(Loss) on Cash Flow Hedges, Beginning Balance	(4,479)
Net Unrealized Losses on Cash Flow Hedges, Current Period Change	446	690
Net Unrealized Gain/(Loss) on Cash Flow Hedges, Ending Balance	(4,033)
Accumulated Other Comprehensive Income, Beginning Balance	37,895
Accumulated Other Comprehensive Income, Current Period Change	6,283	7,195
Accumulated Other Comprehensive Income, Ending Balance	$ 44,178