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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
3 Months Ended 12 Months Ended
Mar. 31, 2016
GBP (£)
Dec. 31, 2015
GBP (£)
Mar. 31, 2016
EUR (€)
Mar. 31, 2016
CHF (SFr)
Mar. 31, 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 8,129     CAD 1,302
Derivative, Maturity Date Feb. 01, 2017 Feb. 01, 2016            
British Pounds [Member]                
Foreign Exchange Contracts [Line Items]                
Foreign exchange contracts, Notional Amount | £ £ 1,600 £ 2,047            
Derivative, Maturity Date Feb. 01, 2017 Feb. 01, 2017            
Euro [Member]                
Foreign Exchange Contracts [Line Items]                
Foreign exchange contracts, Notional Amount | €     € 13,727     € 13,295    
Derivative, Maturity Date Feb. 01, 2017 Feb. 01, 2017            
Swiss Francs [Member]                
Foreign Exchange Contracts [Line Items]                
Foreign exchange contracts, Notional Amount | SFr       SFr 17,200     SFr 17,738  
Derivative, Maturity Date Feb. 01, 2017 Feb. 01, 2017