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Foreign Currency Exchange Rate Risk Foreign Currency Exchange Rate Risk (Details 2) (Foreign exchange contracts, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Other Current Assets
   
Derivatives, Fair Value [Line Items]    
Carrying amount of derivative asset $ 2,106 $ 245
Other Current Liabilities
   
Derivatives, Fair Value [Line Items]    
Carrying amount of derivative liability $ 229 $ 640