Derivative Financial Instruments (Schedule Of Effect Of Derivative Instruments On Financial Performance) (Details) - Cash flow hedging - Foreign currency - Forward contracts - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Derivatives Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive (Loss) Income (Effective Portion)	$ 6,090	$ (11,197)
Derivatives Designated as Hedging Instruments | Operating expenses
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Reclassified from Accumulated Other Comprehensive Loss (Effective Portion)	(13,027)	2,123
Derivatives Not Designated as Hedging Instruments | Other expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized in Income on Derivative	$ 1,669	$ 3,551