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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

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