Derivative Instruments And Hedging Activities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Derivative Instruments And Hedging Activities
Foreign exchange forward contracts durations (months)			36
Cash flow hedges notional amounts	$ 404,578		$ 404,578
Reclassified gain on other comprehensive income			13,431
Foreign exchange forward contracts durations (days)			30
Notional amount of foreign exchange contracts that do not qualify for hedge accounting			146,390
(Loss) gain in other income and expense	$ (5,433)	$ 6,445	$ (12,390)	$ 9,953