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Fair Value Measurements (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Fair value measurement, additional disclosure    
Cash collateral deposits held by financial counterparties $ 26,600,000 $ 22,900,000
Cash collateral deposits held by financial counterparties, offset against liabilities 4,300,000  
Cash collateral deposits held by financial counterparties, not offset 22,300,000  
Cash collateral received from customers 8,400,000 6,600,000
Fair value measured on recurring basis | Level 1
    
Assets:    
Assets 21,689,000 18,087,000
Liabilities:    
Liabilities 25,593,000 20,970,000
Fair value measured on recurring basis | Level 1 | Commodity contracts
    
Assets:    
Assets 21,689,000 18,087,000
Liabilities:    
Liabilities 25,593,000 20,970,000
Fair value measured on recurring basis | Level 2
    
Assets:    
Assets 81,260,000 60,934,000
Liabilities:    
Liabilities 64,583,000 49,102,000
Fair value measured on recurring basis | Level 2 | Commodity contracts
    
Assets:    
Assets 63,644,000 57,682,000
Liabilities:    
Liabilities 50,905,000 44,732,000
Fair value measured on recurring basis | Level 2 | Foreign currency contracts
    
Assets:    
Assets 16,797,000 2,434,000
Liabilities:    
Liabilities 12,680,000 3,845,000
Fair value measured on recurring basis | Level 2 | Inventories
    
Assets:    
Assets 819,000 818,000
Liabilities:    
Liabilities 998,000 525,000
Fair value measured on recurring basis | Level 3
    
Liabilities:    
Debt 276,700,000 380,300,000
Notes receivable 10,700,000 12,700,000
Fair value measured on recurring basis | Sub-Total
    
Assets:    
Assets 102,949,000 79,021,000
Liabilities:    
Liabilities 90,176,000 70,072,000
Fair value measured on recurring basis | Sub-Total | Commodity contracts
    
Assets:    
Assets 85,333,000 75,769,000
Liabilities:    
Liabilities 76,498,000 65,702,000
Fair value measured on recurring basis | Sub-Total | Foreign currency contracts
    
Assets:    
Assets 16,797,000 2,434,000
Liabilities:    
Liabilities 12,680,000 3,845,000
Fair value measured on recurring basis | Sub-Total | Inventories
    
Assets:    
Assets 819,000 818,000
Liabilities:    
Liabilities 998,000 525,000
Fair value measured on recurring basis | Netting and Collateral
    
Assets:    
Assets (80,697,000) (58,929,000)
Liabilities:    
Liabilities (76,582,000) (52,376,000)
Fair value measured on recurring basis | Netting and Collateral | Commodity contracts
    
Assets:    
Assets (67,929,000) (56,115,000)
Liabilities:    
Liabilities (63,814,000) (49,562,000)
Fair value measured on recurring basis | Netting and Collateral | Foreign currency contracts
    
Assets:    
Assets (11,949,000) (2,289,000)
Liabilities:    
Liabilities (11,949,000) (2,289,000)
Fair value measured on recurring basis | Netting and Collateral | Inventories
    
Assets:    
Assets (819,000) (525,000)
Liabilities:    
Liabilities (819,000) (525,000)
Fair value measured on recurring basis | Total
    
Assets:    
Assets 22,252,000 20,092,000
Liabilities:    
Liabilities 13,594,000 17,696,000
Fair value measured on recurring basis | Total | Commodity contracts
    
Assets:    
Assets 17,404,000 19,654,000
Liabilities:    
Liabilities 12,684,000 16,140,000
Fair value measured on recurring basis | Total | Foreign currency contracts
    
Assets:    
Assets 4,848,000 145,000
Liabilities:    
Liabilities 731,000 1,556,000
Fair value measured on recurring basis | Total | Inventories
    
Assets:    
Assets   293,000
Liabilities:    
Liabilities $ 179,000