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Derivative Financial Instruments (Schedule Of Derivative Instruments Included In Balance Sheets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Interest Rate Swap [Member] | Accrued Liabilities [Member]    
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]    
Interest Rate Fair Value Hedge Liability at Fair Value $ 356 $ 0
Interest Rate Swap [Member] | Prepaid Expenses and Other Current Assets [Member]    
Derivative Instruments Not Designated as Hedging Instruments [Abstract]    
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 0 1,444
Foreign Exchange Forward [Member] | Accrued Liabilities [Member]    
Derivative Instruments Not Designated as Hedging Instruments [Abstract]    
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 700 1,223
Foreign Exchange Forward [Member] | Other Assets [Member]    
Derivative Instruments Not Designated as Hedging Instruments [Abstract]    
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 2,057 2,858
Foreign Exchange Forward [Member] | Prepaid Expenses and Other Current Assets [Member]    
Derivative Instruments Not Designated as Hedging Instruments [Abstract]    
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 1,452 943
Foreign Exchange Forward [Member] | Other Liabilities [Member]    
Derivative Instruments Not Designated as Hedging Instruments [Abstract]    
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 2,421 3,252
Other Contract [Member] | Other Assets [Member]    
Derivative Instruments Not Designated as Hedging Instruments [Abstract]    
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value $ 0 $ 37,065