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Derivative Financial Instruments (Schedule Of Derivatives Not Designated As Hedging Instruments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Income (Expense), net [Member] | Foreign Currency Forward Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gains or (Losses) Recognized in Income on Derivative $ (6,945) $ 3,789 $ 4,956