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Fair Value Measurements (Details) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Assets and liabilities measured at estimated fair value on a recurring basis    
Derivative asset $ 187,767,000 $ 59,940,000
Derivative liability 143,046,000 57,818,000
Debt 767,275,000 463,711,000
Level 1
    
Assets and liabilities measured at estimated fair value on a recurring basis    
Subtotal Assets 53,620,000 11,574,000
Subtotal Liabilities 62,655,000 14,032,000
Level 2
    
Assets and liabilities measured at estimated fair value on a recurring basis    
Inventories asset 11,000 1,690,000
Subtotal Assets 132,997,000 50,056,000
Inventories liability 12,233,000 207,000
Subtotal Liabilities 92,535,000 43,993,000
Level 3
    
Assets and liabilities measured at estimated fair value on a recurring basis    
Subtotal Assets 3,259,000  
Subtotal Liabilities 89,000  
Cash surrender value of life insurance | Level 2
    
Assets and liabilities measured at estimated fair value on a recurring basis    
Investments 1,686,000  
Mutual funds | Level 1
    
Assets and liabilities measured at estimated fair value on a recurring basis    
Investments 412,000  
Fair value measured on recurring basis
    
Assets and liabilities measured at estimated fair value on a recurring basis    
Inventories asset 11,000 1,690,000
Subtotal Assets 189,876,000 61,630,000
Netting and collateral,inventories asset (11,000) (207,000)
Netting and collateral, asset (87,861,000) (42,540,000)
Total, inventories asset   1,483,000
Total Assets 102,015,000 19,090,000
Inventories liability 12,233,000 207,000
Subtotal Liabilities 155,279,000 58,025,000
Netting and collateral, inventories liability (11,000) (207,000)
Netting and collateral, liability (119,664,000) (37,886,000)
Total, inventories liability 12,222,000  
Total Liabilities 35,615,000 20,139,000
Fair value measured on recurring basis | Level 3
    
Assets and liabilities measured at estimated fair value on a recurring basis    
Debt 767,300,000 463,700,000
Notes receivable 14,000,000 20,900,000
Fair value measured on recurring basis | Cash surrender value of life insurance
    
Assets and liabilities measured at estimated fair value on a recurring basis    
Investments 1,686,000  
Fair value measured on recurring basis | Mutual funds
    
Assets and liabilities measured at estimated fair value on a recurring basis    
Investments 412,000  
Commodity contracts
    
Assets and liabilities measured at estimated fair value on a recurring basis    
Total, derivative asset 88,578,000 15,471,000
Total, derivative liability 21,545,000 14,686,000
Commodity contracts | Level 1
    
Assets and liabilities measured at estimated fair value on a recurring basis    
Derivative asset 53,208,000 11,574,000
Derivative liability 62,655,000 14,032,000
Commodity contracts | Level 2
    
Assets and liabilities measured at estimated fair value on a recurring basis    
Derivative asset 111,443,000 39,880,000
Derivative liability 69,936,000 31,983,000
Commodity contracts | Level 3
    
Assets and liabilities measured at estimated fair value on a recurring basis    
Derivative asset 3,259,000  
Derivative liability 89,000  
Commodity contracts | Fair value measured on recurring basis
    
Assets and liabilities measured at estimated fair value on a recurring basis    
Derivative asset 167,910,000 51,454,000
Netting and collateral, derivative asset (79,332,000) (35,983,000)
Total, derivative asset 88,578,000 15,471,000
Derivative liability 132,680,000 46,015,000
Netting and collateral, derivative liability (111,135,000) (31,329,000)
Total, derivative liability 21,545,000 14,686,000
Foreign currency contracts
    
Assets and liabilities measured at estimated fair value on a recurring basis    
Total, derivative asset 11,339,000 2,136,000
Total, derivative liability 1,848,000 5,453,000
Foreign currency contracts | Level 2
    
Assets and liabilities measured at estimated fair value on a recurring basis    
Derivative asset 19,857,000 8,486,000
Derivative liability 10,366,000 11,803,000
Foreign currency contracts | Fair value measured on recurring basis
    
Assets and liabilities measured at estimated fair value on a recurring basis    
Derivative asset 19,857,000 8,486,000
Netting and collateral, derivative asset (8,518,000) (6,350,000)
Total, derivative asset 11,339,000 2,136,000
Derivative liability 10,366,000 11,803,000
Netting and collateral, derivative liability (8,518,000) (6,350,000)
Total, derivative liability $ 1,848,000 $ 5,453,000
NQDC plan
    
Assets and liabilities measured at estimated fair value on a recurring basis    
Number of investment assets 2