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Derivative Financial Instruments (Schedule Of Contracts Designated As Hedged Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Norwegian Kroners [Member]
   
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount $ 5,113 $ 7,131
Derivative, Maturity Date Feb. 01, 2014 Feb. 01, 2014
British Pounds [Member]
   
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount 932 1,452
Derivative, Maturity Date Feb. 01, 2014 Feb. 01, 2014
Euros [Member]
   
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount 10,365 17,186
Derivative, Maturity Date Feb. 01, 2014 Feb. 01, 2014
Swiss Francs [Member]
   
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount 14,582 23,838
Derivative, Maturity Date Feb. 01, 2014 Feb. 01, 2014
Canadian Dollars [Member]
   
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount 6,295 10,499
Derivative, Maturity Date Feb. 01, 2014 Feb. 01, 2014
Japanese Yen [Member]
   
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount $ 1,000,526  
Derivative, Maturity Date Feb. 01, 2015