Derivative Financial Instruments (Schedule Of Company's Derivative Instruments On Other Comprehensive Income And The Consolidated Statement Of Operations) (Details) - Derivatives Designated As Hedging Instruments [Member] - Foreign Currency Forward Contracts [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in OCI-Effective Portion	$ 453	$ 292	$ 775
Gain or (Loss) Reclassified from OCI into Income-Effective Portion	453	314	686
Amount of Gain or (Loss) Recognized in Income and Excluded from Effectiveness Testing	(52)	(144)	(117)
Net Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Reclassified from OCI into Income-Effective Portion	462	459	844
Cost Of Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Reclassified from OCI into Income-Effective Portion	6	4	(9)
Operating Expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Reclassified from OCI into Income-Effective Portion	(15)	(149)	(149)
Other Income (Expense), net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income and Excluded from Effectiveness Testing	$ (52)	$ (144)	$ (117)