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Derivative Financial Instruments (Schedule Of Contracts Designated As Hedged Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Canadian Dollars [Member]
    
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount   $ 1,062
Derivative, Maturity Date   Feb. 01, 2014
Norwegian Kroner [Member]
    
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount 6,787 9,253
Derivative, Maturity Date Aug. 01, 2014 Aug. 01, 2014
British Pounds [Member]
    
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount 2,221 2,626
Derivative, Maturity Date Feb. 01, 2015 Feb. 01, 2015
Euros [Member]
    
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount 17,375 20,772
Derivative, Maturity Date Feb. 01, 2015 Feb. 01, 2015
Swiss Francs [Member]
    
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount 25,631 30,698
Derivative, Maturity Date Feb. 01, 2015 Feb. 01, 2015
Japanese Yen [Member]
    
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount 690,115 792,696
Derivative, Maturity Date Feb. 01, 2015 Feb. 01, 2015
Swedish Kronor [Member]
    
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount $ 5,688 $ 6,034
Derivative, Maturity Date Feb. 01, 2015 Feb. 01, 2015