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Derivative Instruments (Schedule of Fair Value of Derivatives Designated as Fair Value Hedges (Details) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Derivatives designated as fair value hedges, Asset Derivatives $ 0 $ 0
Derivatives designated as fair value hedges, Liability Derivatives 126 0
Foreign Currency Derivatives [Member] | Other Receivables [Member]
   
Derivatives designated as fair value hedges, Asset Derivatives 0 0
Foreign Currency Derivatives [Member] | Other Payables [Member]
   
Derivatives designated as fair value hedges, Liability Derivatives $ 126 $ 0