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Fair Value Measurements (Details) (USD $) | Sep. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Fair value measured on recurring basis | Level 1 |  |
Assets: |  |
Total assets | $ 28,889,000 | $ 785,000
Liabilities: |  |
Total liabilities | 30,144,000 | 2,226,000
Fair value measured on recurring basis | Level 1 | Cash equivalents |  |
Assets: |  |
Total assets |  | 32,000
Fair value measured on recurring basis | Level 1 | Commodity contracts |  |
Assets: |  |
Total assets | 28,889,000 | 753,000
Liabilities: |  |
Total liabilities | 30,144,000 | 2,226,000
Fair value measured on recurring basis | Level 2 |  |
Assets: |  |
Total assets | 85,404,000 | 17,915,000
Liabilities: |  |
Total liabilities | 72,975,000 | 15,861,000
Fair value measured on recurring basis | Level 2 | Commodity contracts |  |
Assets: |  |
Total assets | 81,682,000 | 14,139,000
Liabilities: |  |
Total liabilities | 70,796,000 | 14,926,000
Fair value measured on recurring basis | Level 2 | Foreign currency contracts |  |
Assets: |  |
Total assets | 4,096,000 | 461,000
Liabilities: |  |
Total liabilities | 1,191,000 | 574,000
Fair value measured on recurring basis | Level 2 | Hedged item inventories |  |
Assets: |  |
Total assets | (3,864,000) | 2,518,000
Liabilities: |  |
Total liabilities |  | 361,000
Fair value measured on recurring basis | Level 2 | Hedged item commitments |  |
Assets: |  |
Total assets | 3,490,000 | 797,000
Liabilities: |  |
Total liabilities | 988,000 |
Fair value measured on recurring basis | Level 3 |  |
Assets: |  |
Total assets |  | 123,000
Liabilities: |  |
Total liabilities | 5,007,000 | 5,045,000
Fair value measured on recurring basis | Level 3 | Commodity contracts |  |
Assets: |  |
Total assets |  | 123,000
Liabilities: |  |
Total liabilities |  | 33,000
Fair value measured on recurring basis | Level 3 | Earn-out |  |
Liabilities: |  |
Total liabilities | 5,007,000 | 5,012,000
Fair value measured on recurring basis | Sub-Total |  |
Assets: |  |
Total assets | 114,293,000 | 18,823,000
Liabilities: |  |
Total liabilities | 108,126,000 | 23,132,000
Fair value measured on recurring basis | Sub-Total | Cash equivalents |  |
Assets: |  |
Total assets |  | 32,000
Fair value measured on recurring basis | Sub-Total | Commodity contracts |  |
Assets: |  |
Total assets | 110,571,000 | 15,015,000
Liabilities: |  |
Total liabilities | 100,940,000 | 17,185,000
Fair value measured on recurring basis | Sub-Total | Foreign currency contracts |  |
Assets: |  |
Total assets | 4,096,000 | 461,000
Liabilities: |  |
Total liabilities | 1,191,000 | 574,000
Fair value measured on recurring basis | Sub-Total | Hedged item inventories |  |
Assets: |  |
Total assets | (3,864,000) | 2,518,000
Liabilities: |  |
Total liabilities |  | 361,000
Fair value measured on recurring basis | Sub-Total | Hedged item commitments |  |
Assets: |  |
Total assets | 3,490,000 | 797,000
Liabilities: |  |
Total liabilities | 988,000 |
Fair value measured on recurring basis | Sub-Total | Earn-out |  |
Liabilities: |  |
Total liabilities | 5,007,000 | 5,012,000
Fair value measured on recurring basis | Netting and Collateral |  |
Assets: |  |
Total assets | (91,118,000) | (7,542,000)
Liabilities: |  |
Total liabilities | (96,288,000) | (8,933,000)
Fair value measured on recurring basis | Netting and Collateral | Commodity contracts |  |
Assets: |  |
Total assets | (89,894,000) | (7,000,000)
Liabilities: |  |
Total liabilities | (95,064,000) | (8,391,000)
Fair value measured on recurring basis | Netting and Collateral | Foreign currency contracts |  |
Assets: |  |
Total assets | (920,000) | (277,000)
Liabilities: |  |
Total liabilities | (920,000) | (277,000)
Fair value measured on recurring basis | Netting and Collateral | Hedged item inventories |  |
Liabilities: |  |
Total liabilities |  | (265,000)
Fair value measured on recurring basis | Netting and Collateral | Hedged item commitments |  |
Assets: |  |
Total assets | (304,000) | (265,000)
Liabilities: |  |
Total liabilities | (304,000) |
Fair value measured on recurring basis | Total |  |
Assets: |  |
Total assets | 23,175,000 | 11,281,000
Liabilities: |  |
Total liabilities | 11,838,000 | 14,199,000
Fair value measured on recurring basis | Total | Cash equivalents |  |
Assets: |  |
Total assets |  | 32,000
Fair value measured on recurring basis | Total | Commodity contracts |  |
Assets: |  |
Total assets | 20,677,000 | 8,015,000
Liabilities: |  |
Total liabilities | 5,876,000 | 8,794,000
Fair value measured on recurring basis | Total | Foreign currency contracts |  |
Assets: |  |
Total assets | 3,176,000 | 184,000
Liabilities: |  |
Total liabilities | 271,000 | 297,000
Fair value measured on recurring basis | Total | Hedged item inventories |  |
Assets: |  |
Total assets | (3,864,000) | 2,518,000
Liabilities: |  |
Total liabilities |  | 96,000
Fair value measured on recurring basis | Total | Hedged item commitments |  |
Assets: |  |
Total assets | 3,186,000 | 532,000
Liabilities: |  |
Total liabilities | 684,000 |
Fair value measured on recurring basis | Total | Earn-out |  |
Liabilities: |  |
Total liabilities | 5,007,000 | 5,012,000
Netting and Collateral |  |
Fair value measurement, additional disclosure |  |
Amount recognized for the obligation to return cash collateral | 1,000,000 |
Amount recognized for the right to reclaim cash collateral | $ 6,100,000 |

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