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, 2019 CHF (SFr)	Dec. 31, 2018 EUR (€)	Sep. 30, 2019 EUR (€)	Sep. 30, 2019 CAD ($)	Dec. 31, 2018 CAD ($)
Canadian Dollars [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount \| $				$ 11,344	$ 6,166
Derivative, Maturity Date	Aug. 01, 2020	Aug. 01, 2019
Euro [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount \| €		€ 10,710	€ 18,064
Derivative, Maturity Date	Aug. 01, 2020	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