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Fair Value Measurements (Details) (Fair value measured on recurring basis, USD $) | Sep. 30, 2013 | Dec. 31, 2012
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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

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