Derivative Financial Instruments (Schedule Of Effect Of Derivative Instruments On Financial Performance) (Details) (Foreign Currency Exchange Contracts [Member], Forward Contracts [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating Expenses [Member]
Amount of Loss Recognized in Other Comprehensive Income (effective portion)	$ 3,561	$ 2,837
Amount of Loss Reclassified from Accumulated Other Comprehensive Income (loss)	(1,527)	(620)
Derivatives Not Designated As Hedging Instruments [Member] | Other Expenses [Member]
Amount of Loss Recognized in Income on Derivative	$ (176)	$ 866