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Derivative Instruments and Hedges (Fair Value of Forward Exchange Contracts Not Designated as Heding Instruments) (Details) (Nondesignated [Member], Forward Exchange Contracts [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Nondesignated [Member] | Forward Exchange Contracts [Member]
   
Derivative [Line Items]    
(Loss) gain recognized in income $ (1,118) $ 5,575