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Hedging Instruments (Schedule Of Fair Values And Balance Sheet Classifications Of Derivatives Designated As Hedging Instruments) (Details) - Derivatives Designated As Hedging Instruments [Member] - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Hedging Assets, Total derivative instruments presented as cash flow hedges on the balance sheet $ 477 $ 8,926
Hedging Assets, Gross amounts subject to master netting arrangements not offset on the balance sheet 477 679
Hedging Assets, Net amount   8,247
Hedging Liabilities, Total hedging instruments presented on the balance sheet 113,035 94,745
Hedging Liabilities, Gross amounts subject to master netting arrangements not offset on the balance sheet 477 679
Hedging Liabilities, Net amount 112,558 94,066
Cash Flow Hedges [Member]    
Derivatives, Fair Value [Line Items]    
Hedging Liabilities, Total hedging instruments presented on the balance sheet 6,468 1,081
Foreign Currency Exchange Contracts [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Hedging Assets, Total derivative instruments presented as cash flow hedges on the balance sheet 477 8,926
Foreign Currency Exchange Contracts [Member] | Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Hedging Liabilities, Total hedging instruments presented on the balance sheet 6,468 1,081
Foreign Currency Borrowings Designated As Net Investment Hedge On The Balance Sheet [Member] | Long-term Debt [Member]    
Derivatives, Fair Value [Line Items]    
Hedging Liabilities, Total hedging instruments presented on the balance sheet $ 106,567 $ 93,664