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Derivative Financial Instruments (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Inventories
         
Fair values of derivative financial instruments          
Asset Derivatives $ 0   $ 0   $ 0
Liability Derivatives 0   0   0
Amount of Gain (Loss) Recognized in Income on Hedged Items 4,545 100,765 (15,033) 110,368  
Derivatives in Fair Value Hedging Relationships | Futures contracts
         
Fair values of derivative financial instruments          
Asset Derivatives 0   0   0
Liability Derivatives 0   0   0
Amount of Gain (Loss) Recognized in Income on Derivatives $ (4,348) $ (100,666) $ 15,753 $ (110,114)