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Fair Value Measurements (Details) (Fair value measured on recurring basis, USD $)
Sep. 30, 2013
Dec. 31, 2012
Level 1
    
Assets and liabilities measured at fair value on a recurring basis    
Assets $ 30,913,000 $ 18,087,000
Liabilities 14,141,000 20,970,000
Level 2
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 53,037,000 60,934,000
Liabilities 66,467,000 49,102,000
Level 3
    
Assets and liabilities measured at fair value on a recurring basis    
Debt 458,600,000 380,300,000
Notes receivable 9,500,000 12,700,000
Sub-Total
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 83,950,000 79,021,000
Liabilities 80,608,000 70,072,000
Netting and Collateral
    
Assets and liabilities measured at fair value on a recurring basis    
Assets (51,430,000) (58,929,000)
Liabilities (51,095,000) (52,376,000)
Total
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 32,520,000 20,092,000
Liabilities 29,513,000 17,696,000
Commodity contracts | Level 1
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities 14,141,000 20,970,000
Commodity contracts | Level 2
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities 42,960,000 44,732,000
Commodity contracts | Sub-Total
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities 57,101,000 65,702,000
Commodity contracts | Netting and Collateral
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities (43,113,000) (49,562,000)
Commodity contracts | Total
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities 13,988,000 16,140,000
Foreign currency contracts | Level 2
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities 16,555,000 3,845,000
Foreign currency contracts | Sub-Total
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities 16,555,000 3,845,000
Foreign currency contracts | Netting and Collateral
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities (7,982,000) (2,289,000)
Foreign currency contracts | Total
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities 8,573,000 1,556,000
Inventories | Level 2
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities 6,952,000 525,000
Inventories | Sub-Total
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities 6,952,000 525,000
Inventories | Netting and Collateral
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities   (525,000)
Inventories | Total
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities 6,952,000  
Commodity contracts | Level 1
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 30,913,000 18,087,000
Commodity contracts | Level 2
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 44,481,000 57,682,000
Commodity contracts | Sub-Total
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 75,394,000 75,769,000
Commodity contracts | Netting and Collateral
    
Assets and liabilities measured at fair value on a recurring basis    
Assets (43,448,000) (56,115,000)
Commodity contracts | Total
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 31,946,000 19,654,000
Foreign currency contracts | Level 2
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 8,556,000 2,434,000
Foreign currency contracts | Sub-Total
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 8,556,000 2,434,000
Foreign currency contracts | Netting and Collateral
    
Assets and liabilities measured at fair value on a recurring basis    
Assets (7,982,000) (2,289,000)
Foreign currency contracts | Total
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 574,000 145,000
Inventories | Level 2
    
Assets and liabilities measured at fair value on a recurring basis    
Assets   818,000
Inventories | Sub-Total
    
Assets and liabilities measured at fair value on a recurring basis    
Assets   818,000
Inventories | Netting and Collateral
    
Assets and liabilities measured at fair value on a recurring basis    
Assets   (525,000)
Inventories | Total
    
Assets and liabilities measured at fair value on a recurring basis    
Assets   $ 293,000