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Derivative Financial Instruments (Details 6) (Derivatives not designated as either fair value hedges or cash flow hedges, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Derivative Financial Instruments    
Amount of Gain (Loss) Recognized in Income on Derivatives $ 15,486 $ 345
Product contracts | Cost of sales
   
Derivative Financial Instruments    
Amount of Gain (Loss) Recognized in Income on Derivatives 15,543 666
Foreign currency derivatives | Cost of sales
   
Derivative Financial Instruments    
Amount of Gain (Loss) Recognized in Income on Derivatives $ (57) $ (321)