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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, 2012
Dec. 31, 2011
Norwegian Kroners [Member]
   
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount $ 322 $ 3,633
Derivative, Maturity Date Sep. 01, 2012 Sep. 01, 2012
British Pounds [Member]
   
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount 940 1,632
Derivative, Maturity Date Feb. 01, 2013 Feb. 01, 2013
Euros [Member]
   
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount 12,878 14,937
Derivative, Maturity Date Aug. 01, 2013 Feb. 01, 2013
Swiss Francs [Member]
   
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount 16,892 24,225
Derivative, Maturity Date Aug. 01, 2013 Feb. 01, 2013
Canadian Dollars [Member]
   
Foreign Exchange Contracts [Line Items]    
Foreign exchange contracts, Notional Amount $ 6,828 $ 9,141
Derivative, Maturity Date Mar. 01, 2013 Mar. 01, 2013