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Derivatives (Details 2) (Sales, USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sales
       
Company's Consolidated Statement of Income gains and location of line items        
Gains (losses) on commodity derivatives included in sales and merchandising revenues $ 30,894 $ (51,318) $ 99,896 $ (67,875)