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Fair Value Measurements (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Fair value measurement, additional disclosure    
Cash collateral deposits held by financial counterparties $ 139,900,000  
Netting and Collateral
    
Fair value measurement, additional disclosure    
Cash collateral deposits held by financial counterparties 21,400,000 11,800,000
Amount recognized for the obligation to return cash collateral 63,000,000  
Amount recognized for the right to reclaim cash collateral 76,900,000  
Fair value measured on recurring basis | Level 1
    
Assets:    
Total assets 68,793,000 14,038,000
Liabilities:    
Total liabilities 94,341,000 10,148,000
Fair value measured on recurring basis | Level 1 | Commodity contracts
    
Assets:    
Total assets 68,793,000 14,038,000
Liabilities:    
Total liabilities 94,341,000 10,148,000
Fair value measured on recurring basis | Level 2
    
Assets:    
Total assets 187,190,000 57,449,000
Liabilities:    
Debt under Term Loan Facility 250,000,000 250,000,000
Total liabilities 160,888,000 47,796,000
Fair value measured on recurring basis | Level 2 | Commodity contracts
    
Assets:    
Total assets 179,333,000 51,033,000
Liabilities:    
Total liabilities 158,182,000 46,754,000
Fair value measured on recurring basis | Level 2 | Foreign currency contracts
    
Assets:    
Total assets 2,215,000 2,994,000
Liabilities:    
Total liabilities 2,098,000 1,018,000
Fair value measured on recurring basis | Level 2 | Hedged item inventories
    
Assets:    
Total assets 5,642,000 3,216,000
Liabilities:    
Total liabilities 608,000 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 6,700,000 6,800,000
Liabilities:    
All other debt 82,000,000 37,100,000
Total liabilities   4,194,000
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 255,983,000 71,487,000
Liabilities:    
Total liabilities 255,229,000 62,138,000
Fair value measured on recurring basis | Sub-Total | Commodity contracts
    
Assets:    
Total assets 248,126,000 65,071,000
Liabilities:    
Total liabilities 252,523,000 56,902,000
Fair value measured on recurring basis | Sub-Total | Foreign currency contracts
    
Assets:    
Total assets 2,215,000 2,994,000
Liabilities:    
Total liabilities 2,098,000 1,018,000
Fair value measured on recurring basis | Sub-Total | Hedged item inventories
    
Assets:    
Total assets 5,642,000 3,216,000
Liabilities:    
Total liabilities 608,000 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 (178,915,000) (44,168,000)
Liabilities:    
Total liabilities (234,404,000) (44,184,000)
Fair value measured on recurring basis | Netting and Collateral | Commodity contracts
    
Assets:    
Total assets (177,205,000) (43,275,000)
Liabilities:    
Total liabilities (232,694,000) (43,291,000)
Fair value measured on recurring basis | Netting and Collateral | Foreign currency contracts
    
Assets:    
Total assets (1,710,000) (893,000)
Liabilities:    
Total liabilities (1,710,000) (893,000)
Fair value measured on recurring basis | Total
    
Assets:    
Total assets 77,068,000 27,319,000
Liabilities:    
Total liabilities 20,825,000 17,954,000
Fair value measured on recurring basis | Total | Commodity contracts
    
Assets:    
Total assets 70,921,000 21,796,000
Liabilities:    
Total liabilities 19,829,000 13,611,000
Fair value measured on recurring basis | Total | Foreign currency contracts
    
Assets:    
Total assets 505,000 2,101,000
Liabilities:    
Total liabilities 388,000 125,000
Fair value measured on recurring basis | Total | Hedged item inventories
    
Assets:    
Total assets 5,642,000 3,216,000
Liabilities:    
Total liabilities 608,000 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