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Fair Value Measurements (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Fair value measurement, additional disclosure    
Cash collateral deposits held by financial counterparties $ 34,300,000 $ 22,900,000
Cash collateral deposits held by financial counterparties, offset against liabilities 10,700,000  
Cash collateral deposits held by financial counterparties, not offset 23,600,000  
Cash collateral received from customers 600,000 6,600,000
Fair value measured on recurring basis | Level 1
    
Assets:    
Assets 21,781,000 18,087,000
Liabilities:    
Liabilities 12,717,000 20,970,000
Fair value measured on recurring basis | Level 1 | Commodity contracts
    
Assets:    
Assets 21,781,000 18,087,000
Liabilities:    
Liabilities 12,717,000 20,970,000
Fair value measured on recurring basis | Level 2
    
Assets:    
Assets 69,635,000 60,934,000
Liabilities:    
Liabilities 68,164,000 49,102,000
Fair value measured on recurring basis | Level 2 | Commodity contracts
    
Assets:    
Assets 56,741,000 57,682,000
Liabilities:    
Liabilities 55,926,000 44,732,000
Fair value measured on recurring basis | Level 2 | Foreign currency contracts
    
Assets:    
Assets 12,331,000 2,434,000
Liabilities:    
Liabilities 10,385,000 3,845,000
Fair value measured on recurring basis | Level 2 | Inventories
    
Assets:    
Assets 563,000 818,000
Liabilities:    
Liabilities 1,853,000 525,000
Fair value measured on recurring basis | Level 3
    
Liabilities:    
Liabilities 89,000  
Debt 351,400,000 380,300,000
Notes receivable 10,100,000 12,700,000
Fair value measured on recurring basis | Level 3 | Commodity contracts
    
Liabilities:    
Liabilities 89,000  
Fair value measured on recurring basis | Sub-Total
    
Assets:    
Assets 91,416,000 79,021,000
Liabilities:    
Liabilities 80,970,000 70,072,000
Fair value measured on recurring basis | Sub-Total | Commodity contracts
    
Assets:    
Assets 78,522,000 75,769,000
Liabilities:    
Liabilities 68,732,000 65,702,000
Fair value measured on recurring basis | Sub-Total | Foreign currency contracts
    
Assets:    
Assets 12,331,000 2,434,000
Liabilities:    
Liabilities 10,385,000 3,845,000
Fair value measured on recurring basis | Sub-Total | Inventories
    
Assets:    
Assets 563,000 818,000
Liabilities:    
Liabilities 1,853,000 525,000
Fair value measured on recurring basis | Netting and Collateral
    
Assets:    
Assets (52,348,000) (58,929,000)
Liabilities:    
Liabilities (62,438,000) (52,376,000)
Fair value measured on recurring basis | Netting and Collateral | Commodity contracts
    
Assets:    
Assets (42,995,000) (56,115,000)
Liabilities:    
Liabilities (53,085,000) (49,562,000)
Fair value measured on recurring basis | Netting and Collateral | Foreign currency contracts
    
Assets:    
Assets (8,790,000) (2,289,000)
Liabilities:    
Liabilities (8,790,000) (2,289,000)
Fair value measured on recurring basis | Netting and Collateral | Inventories
    
Assets:    
Assets (563,000) (525,000)
Liabilities:    
Liabilities (563,000) (525,000)
Fair value measured on recurring basis | Total
    
Assets:    
Assets 39,068,000 20,092,000
Liabilities:    
Liabilities 18,532,000 17,696,000
Fair value measured on recurring basis | Total | Commodity contracts
    
Assets:    
Assets 35,527,000 19,654,000
Liabilities:    
Liabilities 15,647,000 16,140,000
Fair value measured on recurring basis | Total | Foreign currency contracts
    
Assets:    
Assets 3,541,000 145,000
Liabilities:    
Liabilities 1,595,000 1,556,000
Fair value measured on recurring basis | Total | Inventories
    
Assets:    
Assets   293,000
Liabilities:    
Liabilities $ 1,290,000