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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, 2016
GBP (£)
Dec. 31, 2015
GBP (£)
Sep. 30, 2016
EUR (€)
Sep. 30, 2016
CAD
Dec. 31, 2015
EUR (€)
Dec. 31, 2015
CHF (SFr)
Dec. 31, 2015
CAD
Canadian Dollars [Member]              
Foreign Exchange Contracts [Line Items]              
Foreign exchange contracts, Notional Amount | CAD       CAD 14,796     CAD 1,302
Canadian Dollars [Member] | Designated as Hedging Instrument [Member]              
Foreign Exchange Contracts [Line Items]              
Derivative, Maturity Date Feb. 01, 2018 Feb. 01, 2016          
British Pounds [Member]              
Foreign Exchange Contracts [Line Items]              
Foreign exchange contracts, Notional Amount | £ £ 2,333 £ 2,047          
British Pounds [Member] | Designated as Hedging Instrument [Member]              
Foreign Exchange Contracts [Line Items]              
Derivative, Maturity Date Feb. 01, 2018 Feb. 01, 2017          
Euro [Member]              
Foreign Exchange Contracts [Line Items]              
Foreign exchange contracts, Notional Amount | €     € 19,104   € 13,295    
Euro [Member] | Designated as Hedging Instrument [Member]              
Foreign Exchange Contracts [Line Items]              
Derivative, Maturity Date Feb. 01, 2018 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