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Derivative Instruments and Hedging Activities - Additional Information (Details) (Cost of sales, Commodity contracts, USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Cost of sales | Commodity contracts
       
Derivatives, Fair Value [Line Items]        
Recognized gain (loss) in cost of sales on commodity contracts not designated as hedging instruments $ 207 $ 291 $ (874) $ 835