Derivative Financial Instruments (Schedule Of Contracts Designated As Hedged Instruments) (Details) € in Thousands, SFr in Thousands, $ in Thousands	Dec. 31, 2020 CAD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2019 CAD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 CHF (SFr)
Canadian Dollars [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount \| $	$ 14,587		$ 15,932
Euro [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount \| €		€ 24,481		€ 18,168
Swiss Francs [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount \| SFr					SFr 661