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Derivative Financial Instruments (Schedule Of Contracts Designated As Hedged Instruments) (Details) - Designated as Hedging Instrument [Member]
€ in Thousands, SFr in Thousands, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
CHF (SFr)
Dec. 31, 2018
EUR (€)
Sep. 30, 2019
EUR (€)
Sep. 30, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Canadian Dollars [Member]          
Foreign Exchange Contracts [Line Items]          
Foreign exchange contracts, Notional Amount | $       $ 11,344 $ 6,166
Derivative, Maturity Date Aug. 01, 2020 Aug. 01, 2019      
Euro [Member]          
Foreign Exchange Contracts [Line Items]          
Foreign exchange contracts, Notional Amount | €   € 10,710 € 18,064    
Derivative, Maturity Date Aug. 01, 2020 Feb. 01, 2020      
Swiss Francs [Member]          
Foreign Exchange Contracts [Line Items]          
Foreign exchange contracts, Notional Amount | SFr SFr 661        
Derivative, Maturity Date Aug. 01, 2020