Derivative Financial Instruments (Schedule Of Contracts Designated As Hedged Instruments) (Details) € in Thousands, £ in Thousands, SFr in Thousands, CAD in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016 CAD	Dec. 31, 2015 GBP (£)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 CHF (SFr)	Dec. 31, 2015 CAD	Dec. 31, 2015 USD ($)
Not Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount							$ 0
Canadian Dollars [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount | CAD	CAD 8,955					CAD 1,302
Canadian Dollars [Member] | Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Line Items]
Derivative, Maturity Date	Aug. 01, 2017	Feb. 01, 2016
British Pounds [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount | £		£ 2,047
British Pounds [Member] | Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Line Items]
Derivative, Maturity Date		Feb. 01, 2017
British Pounds [Member] | Not Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount			$ 1,104
Derivative, Maturity Date	Feb. 01, 2017
Euro [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount | €				€ 13,295
Euro [Member] | Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Line Items]
Derivative, Maturity Date		Feb. 01, 2017
Euro [Member] | Not Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount			8,678
Derivative, Maturity Date	Feb. 01, 2017
Swiss Francs [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount | SFr					SFr 17,738
Swiss Francs [Member] | Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Line Items]
Derivative, Maturity Date		Feb. 01, 2017
Swiss Francs [Member] | Not Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount			$ 10,993
Derivative, Maturity Date	Feb. 01, 2017