Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments (Schedule Of Contracts Designated As Hedged Instruments) (Details)

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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, $ 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