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Derivative Financial Instruments (Schedule Of Contracts Designated As Hedged Instruments) (Details) - Designated as Hedging Instrument [Member]
€ in Thousands, $ in Thousands
Mar. 31, 2021
CAD ($)
Mar. 31, 2021
EUR (€)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
EUR (€)
Canadian Dollars [Member]        
Foreign Exchange Contracts [Line Items]        
Foreign exchange contracts, Notional Amount | $ $ 11,594   $ 14,587  
Euro [Member]        
Foreign Exchange Contracts [Line Items]        
Foreign exchange contracts, Notional Amount | €   € 19,966   € 24,481