Derivative Instruments (Effect Of Derivative Instruments Designated As Hedges On AOCI) (Details) (Foreign Currency Contracts [Member], USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Amount of (loss) gain recognized in AOCI (effective portion)	$ 306	$ (388)	$ (100)	$ 51
Revenues [Member]
Amount of (loss) gain reclassified from accumulated AOCI (effective portion)	(271)	554	(1,301)	686
Operating Expenses [Member]
Amount of (loss) gain reclassified from accumulated AOCI (effective portion)	$ 628	$ 62	$ 1,128	$ 384