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Derivative Financial Instruments (Schedule Of Contracts Designated As Hedged Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Canadian Dollars [Member]
    
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount $ 4,376 $ 10,499
Derivative, Maturity Date Feb. 01, 2014 Feb. 01, 2014
Norwegian Kroner [Member]
    
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount 7,320 7,131
Derivative, Maturity Date Aug. 01, 2014 Feb. 01, 2014
British Pounds [Member]
    
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount 1,228 1,452
Derivative, Maturity Date Aug. 01, 2014 Feb. 01, 2014
Euros [Member]
    
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount 25,706 17,186
Derivative, Maturity Date Feb. 01, 2015 Feb. 01, 2014
Swiss Francs [Member]
    
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount 34,297 23,838
Derivative, Maturity Date Feb. 01, 2015 Feb. 01, 2014
Japanese Yen [Member]
    
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount 946,547  
Derivative, Maturity Date Feb. 01, 2015  
Swedish Kronor [Member]
    
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount $ 6,034  
Derivative, Maturity Date Feb. 01, 2015