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