Derivative Financial Instruments (Schedule Of Contracts Designated As Hedged Instruments) (Details) € in Thousands, SFr in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CHF (SFr)	Dec. 31, 2018 EUR (€)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 CAD ($)	Dec. 31, 2018 CAD ($)
Canadian Dollars [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount \| $				$ 15,932	$ 6,166
Derivative, Maturity Date	Feb. 01, 2021	Aug. 01, 2019
Euro [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount \| €		€ 10,710	€ 18,168
Derivative, Maturity Date	Feb. 01, 2021	Feb. 01, 2020
Swiss Francs [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount \| SFr	SFr 661
Derivative, Maturity Date	Aug. 01, 2020