Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments (Schedule Of Contracts Designated As Hedged Instruments) (Details)

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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, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Sep. 30, 2020
EUR (€)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
CHF (SFr)
Canadian Dollars [Member]          
Foreign Exchange Contracts [Line Items]          
Foreign exchange contracts, Notional Amount | $ $ 8,279 $ 15,932      
Derivative, Maturity Date Aug. 31, 2021 Feb. 01, 2021      
Euro [Member]          
Foreign Exchange Contracts [Line Items]          
Foreign exchange contracts, Notional Amount | €     € 25,962 € 18,168  
Derivative, Maturity Date Feb. 28, 2022 Feb. 01, 2021      
Swiss Francs [Member]          
Foreign Exchange Contracts [Line Items]          
Foreign exchange contracts, Notional Amount | SFr         SFr 661
Derivative, Maturity Date   Aug. 01, 2020