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Fair Value Measurements (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Fair value measurement, additional disclosure    
Cash collateral deposits held by financial counterparties $ 4,900,000 $ 11,800,000
Netting and Collateral
    
Fair value measurement, additional disclosure    
Cash collateral deposits held by financial counterparties 200,000  
Fair value measured on recurring basis | Level 1
    
Assets:    
Total assets 31,312,000 14,038,000
Liabilities:    
Total liabilities 32,699,000 10,148,000
Fair value measured on recurring basis | Level 1 | Commodity contracts
    
Assets:    
Total assets 31,312,000 14,038,000
Liabilities:    
Total liabilities 32,699,000 10,148,000
Fair value measured on recurring basis | Level 2
    
Assets:    
Total assets 112,387,000 57,449,000
Liabilities:    
Total liabilities 105,845,000 47,796,000
Fair value measured on recurring basis | Level 2 | Commodity contracts
    
Assets:    
Total assets 106,622,000 51,033,000
Liabilities:    
Total liabilities 96,007,000 46,754,000
Fair value measured on recurring basis | Level 2 | Foreign currency contracts
    
Assets:    
Total assets 5,190,000 2,994,000
Liabilities:    
Total liabilities 8,393,000 1,018,000
Fair value measured on recurring basis | Level 2 | Hedged item inventories
    
Assets:    
Total assets 575,000 3,216,000
Liabilities:    
Total liabilities 1,445,000 24,000
Fair value measured on recurring basis | Level 2 | Hedged item commitments
    
Assets:    
Total assets   206,000
Fair value measured on recurring basis | Level 3
    
Assets:    
Notes receivable 7,000,000 6,800,000
Total assets 1,747,000  
Liabilities:    
Debt 287,200,000 287,100,000
Total liabilities   4,194,000
Fair value measured on recurring basis | Level 3 | Commodity contracts
    
Assets:    
Total assets 1,747,000  
Fair value measured on recurring basis | Level 3 | Earn-out
    
Liabilities:    
Total liabilities   4,194,000
Fair value measured on recurring basis | Sub-Total
    
Assets:    
Total assets 145,446,000 71,487,000
Liabilities:    
Total liabilities 138,544,000 62,138,000
Fair value measured on recurring basis | Sub-Total | Commodity contracts
    
Assets:    
Total assets 139,681,000 65,071,000
Liabilities:    
Total liabilities 128,706,000 56,902,000
Fair value measured on recurring basis | Sub-Total | Foreign currency contracts
    
Assets:    
Total assets 5,190,000 2,994,000
Liabilities:    
Total liabilities 8,393,000 1,018,000
Fair value measured on recurring basis | Sub-Total | Hedged item inventories
    
Assets:    
Total assets 575,000 3,216,000
Liabilities:    
Total liabilities 1,445,000 24,000
Fair value measured on recurring basis | Sub-Total | Hedged item commitments
    
Assets:    
Total assets   206,000
Fair value measured on recurring basis | Sub-Total | Earn-out
    
Liabilities:    
Total liabilities   4,194,000
Fair value measured on recurring basis | Netting and Collateral
    
Assets:    
Total assets (106,965,000) (44,168,000)
Liabilities:    
Total liabilities (106,715,000) (44,184,000)
Fair value measured on recurring basis | Netting and Collateral | Commodity contracts
    
Assets:    
Total assets (101,945,000) (43,275,000)
Liabilities:    
Total liabilities (101,695,000) (43,291,000)
Fair value measured on recurring basis | Netting and Collateral | Foreign currency contracts
    
Assets:    
Total assets (5,020,000) (893,000)
Liabilities:    
Total liabilities (5,020,000) (893,000)
Fair value measured on recurring basis | Total
    
Assets:    
Total assets 38,481,000 27,319,000
Liabilities:    
Total liabilities 31,829,000 17,954,000
Fair value measured on recurring basis | Total | Commodity contracts
    
Assets:    
Total assets 37,736,000 21,796,000
Liabilities:    
Total liabilities 27,011,000 13,611,000
Fair value measured on recurring basis | Total | Foreign currency contracts
    
Assets:    
Total assets 170,000 2,101,000
Liabilities:    
Total liabilities 3,373,000 125,000
Fair value measured on recurring basis | Total | Hedged item inventories
    
Assets:    
Total assets 575,000 3,216,000
Liabilities:    
Total liabilities 1,445,000 24,000
Fair value measured on recurring basis | Total | Hedged item commitments
    
Assets:    
Total assets   206,000
Fair value measured on recurring basis | Total | Earn-out
    
Liabilities:    
Total liabilities   $ 4,194,000