Derivative Financial Instruments (Schedule Of Contracts Designated As Hedged Instruments) (Details) - Designated as Hedging Instrument [Member] € in Thousands, SFr in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020 EUR (€)	Dec. 31, 2019 EUR (€)	Mar. 31, 2020 CHF (SFr)	Mar. 31, 2020 CAD ($)	Dec. 31, 2019 CHF (SFr)	Dec. 31, 2019 CAD ($)
Canadian Dollars [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount \| $				$ 13,762		$ 15,932
Derivative, Maturity Date	Feb. 01, 2021	Feb. 01, 2021
Euro [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount \| €	€ 23,555	€ 18,168
Derivative, Maturity Date	Feb. 01, 2021	Feb. 01, 2021
Swiss Francs [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount \| SFr			SFr 580		SFr 661
Derivative, Maturity Date	Aug. 01, 2020	Aug. 01, 2020