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Fair Value Measurements (Details) (Fair value measured on recurring basis, USD $)
Dec. 31, 2013
Dec. 31, 2012
Level 1
    
Assets and liabilities measured at fair value on a recurring basis    
Assets $ 11,574,000 $ 18,087,000
Liabilities 14,032,000 20,970,000
Level 2
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 50,056,000 60,934,000
Liabilities 43,993,000 49,102,000
Level 3
    
Assets and liabilities measured at fair value on a recurring basis    
Debt 463,700,000 380,300,000
Notes receivable 20,900,000 12,700,000
Sub-Total
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 61,630,000 79,021,000
Liabilities 58,025,000 70,072,000
Netting and Collateral
    
Assets and liabilities measured at fair value on a recurring basis    
Assets (42,540,000) (58,929,000)
Liabilities (37,886,000) (52,376,000)
Total
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 19,090,000 20,092,000
Liabilities 20,139,000 17,696,000
Commodity contracts | Level 1
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities 14,032,000 20,970,000
Commodity contracts | Level 2
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities 31,983,000 44,732,000
Commodity contracts | Sub-Total
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities 46,015,000 65,702,000
Commodity contracts | Netting and Collateral
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities (31,329,000) (49,562,000)
Commodity contracts | Total
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities 14,686,000 16,140,000
Foreign currency contracts | Level 2
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities 11,803,000 3,845,000
Foreign currency contracts | Sub-Total
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities 11,803,000 3,845,000
Foreign currency contracts | Netting and Collateral
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities (6,350,000) (2,289,000)
Foreign currency contracts | Total
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities 5,453,000 1,556,000
Inventories | Level 2
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities 207,000 525,000
Inventories | Sub-Total
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities 207,000 525,000
Inventories | Netting and Collateral
    
Assets and liabilities measured at fair value on a recurring basis    
Liabilities (207,000) (525,000)
Commodity contracts | Level 1
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 11,574,000 18,087,000
Commodity contracts | Level 2
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 39,880,000 57,682,000
Commodity contracts | Sub-Total
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 51,454,000 75,769,000
Commodity contracts | Netting and Collateral
    
Assets and liabilities measured at fair value on a recurring basis    
Assets (35,983,000) (56,115,000)
Commodity contracts | Total
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 15,471,000 19,654,000
Foreign currency contracts | Level 2
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 8,486,000 2,434,000
Foreign currency contracts | Sub-Total
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 8,486,000 2,434,000
Foreign currency contracts | Netting and Collateral
    
Assets and liabilities measured at fair value on a recurring basis    
Assets (6,350,000) (2,289,000)
Foreign currency contracts | Total
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 2,136,000 145,000
Inventories | Level 2
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 1,690,000 818,000
Inventories | Sub-Total
    
Assets and liabilities measured at fair value on a recurring basis    
Assets 1,690,000 818,000
Inventories | Netting and Collateral
    
Assets and liabilities measured at fair value on a recurring basis    
Assets (207,000) (525,000)
Inventories | Total
    
Assets and liabilities measured at fair value on a recurring basis    
Assets $ 1,483,000 $ 293,000