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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
6 Months Ended 12 Months Ended
Jun. 30, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Jun. 30, 2020
EUR (€)
Jun. 30, 2020
CHF (SFr)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
CHF (SFr)
Canadian Dollars [Member]            
Foreign Exchange Contracts [Line Items]            
Foreign exchange contracts, Notional Amount | $ $ 10,333 $ 15,932        
Derivative, Maturity Date Feb. 01, 2021 Feb. 01, 2021        
Euro [Member]            
Foreign Exchange Contracts [Line Items]            
Foreign exchange contracts, Notional Amount | €     € 23,562   € 18,168  
Derivative, Maturity Date Aug. 01, 2021 Feb. 01, 2021        
Swiss Francs [Member]            
Foreign Exchange Contracts [Line Items]            
Foreign exchange contracts, Notional Amount | SFr       SFr 194   SFr 661
Derivative, Maturity Date Aug. 01, 2020 Aug. 01, 2020