Derivative Financial Instruments (Schedule Of Contracts Designated As Hedged Instruments) (Details) € in Thousands, £ in Thousands, SFr in Thousands, CAD in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015 CHF (SFr)	Dec. 31, 2014 CHF (SFr)	Sep. 30, 2015 EUR (€)	Sep. 30, 2015 CAD	Sep. 30, 2015 GBP (£)	Dec. 31, 2014 EUR (€)	Dec. 31, 2014 CAD	Dec. 31, 2014 GBP (£)
Canadian Dollars [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount \| CAD				CAD 5,858			CAD 12,053
Derivative, Maturity Date	Feb. 01, 2016	Feb. 01, 2016
British Pounds [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount					£ 1,180			£ 2,739
Derivative, Maturity Date	Feb. 01, 2016	Feb. 01, 2016
Euros [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount \| €			€ 18,866			€ 36,673
Derivative, Maturity Date	Feb. 01, 2016	Feb. 01, 2016
Swiss Francs [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount \| SFr	SFr 12,724	SFr 31,344
Derivative, Maturity Date	Feb. 01, 2016	Feb. 01, 2016