Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Accumulated Other Comprehensive Income [Roll Forward]
Foreign Currency Translation Adjustment, Beginning Balance			$ 42,394
Foreign Currency Translation Adjustment, Current Period Change	6,750	(34,142)	7,195	(17,919)
Foreign Currency Translation Adjustment, Ending Balance	49,589		49,589
Defined Benefit Plans, Beginning Balance			(20)
Defined Benefit Plans, Current Period Change	42	41	(335)	(84)
Defined Benefit Plans, Ending Balance	(355)		(355)
Net Unrealized Losses on Cash Flow Hedges, Beginning Balance			(4,479)
Net Unrealized Losses on Cash Flow Hedges, Current Period Change	(592)	(187)	(1,655)	(632)
Net Unrealized Losses on Cash Flow Hedges, Ending Balance	(2,824)		(2,824)
Accumulated Other Comprehensive Income, Beginning Balance			37,895
Accumulated Other Comprehensive Income, Current Period Change	7,384	(33,914)	8,515	(17,371)
Accumulated Other Comprehensive Income, Ending Balance	46,410		46,410
Interest Rate Swap [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Net Unrealized Losses on Cash Flow Hedges, Current Period Change	$ (592)	$ (187)	$ (1,655)	$ (632)