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Fair Value Measurements (Details) (Fair value measured on recurring basis, USD $)
Dec. 31, 2012
Dec. 31, 2011
Level 1
    
Assets:    
Assets $ 18,087,000 $ 14,038,000
Liabilities:    
Liabilities 20,970,000 10,148,000
Level 1 | Commodity contracts
    
Assets:    
Assets 18,087,000 14,038,000
Liabilities:    
Liabilities 20,970,000 10,148,000
Level 2
    
Assets:    
Assets 60,934,000 57,449,000
Liabilities:    
Liabilities 49,102,000 47,796,000
Level 2 | Commodity contracts
    
Assets:    
Assets 57,682,000 51,033,000
Liabilities:    
Liabilities 44,732,000 46,754,000
Level 2 | Foreign currency contracts
    
Assets:    
Assets 2,434,000 2,994,000
Liabilities:    
Liabilities 3,845,000 1,018,000
Level 2 | Hedged item inventories
    
Assets:    
Assets 818,000 3,216,000
Liabilities:    
Liabilities 525,000  
Level 2 | Hedged item commitments
    
Assets:    
Assets   206,000
Liabilities:    
Liabilities   24,000
Level 3
    
Liabilities:    
Liabilities   4,194,000
Debt 380,300,000 287,100,000
Notes receivable 12,700,000 6,800,000
Cash collateral deposits held by financial counterparties 22,900,000 11,800,000
Amount recognized for the obligation to return cash collateral 6,600,000  
Level 3 | Earn-out
    
Liabilities:    
Liabilities   4,194,000
Sub-Total
    
Assets:    
Assets 79,021,000 71,487,000
Liabilities:    
Liabilities 70,072,000 62,138,000
Sub-Total | Commodity contracts
    
Assets:    
Assets 75,769,000 65,071,000
Liabilities:    
Liabilities 65,702,000 56,902,000
Sub-Total | Foreign currency contracts
    
Assets:    
Assets 2,434,000 2,994,000
Liabilities:    
Liabilities 3,845,000 1,018,000
Sub-Total | Hedged item inventories
    
Assets:    
Assets 818,000 3,216,000
Liabilities:    
Liabilities 525,000  
Sub-Total | Hedged item commitments
    
Assets:    
Assets   206,000
Liabilities:    
Liabilities   24,000
Netting and Collateral
    
Assets:    
Assets (58,404,000) (44,168,000)
Liabilities:    
Liabilities (51,851,000) (44,184,000)
Netting and Collateral | Commodity contracts
    
Assets:    
Assets (56,115,000) (43,275,000)
Liabilities:    
Liabilities (49,562,000) (43,291,000)
Netting and Collateral | Foreign currency contracts
    
Assets:    
Assets (2,289,000) (893,000)
Liabilities:    
Liabilities (2,289,000) (893,000)
Total
    
Assets:    
Assets 20,617,000 27,319,000
Liabilities:    
Liabilities 18,221,000 17,954,000
Total | Commodity contracts
    
Assets:    
Assets 19,654,000 21,796,000
Liabilities:    
Liabilities 16,140,000 13,611,000
Total | Foreign currency contracts
    
Assets:    
Assets 145,000 2,101,000
Liabilities:    
Liabilities 1,556,000 125,000
Total | Hedged item inventories
    
Assets:    
Assets 818,000 3,216,000
Liabilities:    
Liabilities 525,000  
Total | Hedged item commitments
    
Assets:    
Assets   206,000
Liabilities:    
Liabilities   24,000
Total | Earn-out
    
Liabilities:    
Liabilities   $ 4,194,000