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) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Norwegian Kroners [Member]
   
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount $ 6,883 $ 7,131
Derivative, Maturity Date Feb. 01, 2014 Feb. 01, 2014
British Pounds [Member]
   
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount 1,161 1,452
Derivative, Maturity Date Feb. 01, 2014 Feb. 01, 2014
Euros [Member]
   
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount 14,470 17,186
Derivative, Maturity Date Feb. 01, 2014 Feb. 01, 2014
Swiss Francs [Member]
   
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount 20,110 23,838
Derivative, Maturity Date Feb. 01, 2014 Feb. 01, 2014
Canadian Dollars [Member]
   
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount 8,750 10,499
Derivative, Maturity Date Feb. 01, 2014 Feb. 01, 2014
Japanese Yen [Member]
   
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount $ 553,175  
Derivative, Maturity Date Feb. 01, 2014