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Fair Value Measurements (Details) (USD $) | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Fair value measurement, additional disclosure |  |
Cash collateral deposits held by financial counterparties | $ 34,300,000 | $ 22,900,000
Cash collateral deposits held by financial counterparties, offset against liabilities | 10,700,000 |
Cash collateral deposits held by financial counterparties, not offset | 23,600,000 |
Cash collateral received from customers | 600,000 | 6,600,000
Fair value measured on recurring basis | Level 1 |  |
Assets: |  |
Assets | 21,781,000 | 18,087,000
Liabilities: |  |
Liabilities | 12,717,000 | 20,970,000
Fair value measured on recurring basis | Level 1 | Commodity contracts |  |
Assets: |  |
Assets | 21,781,000 | 18,087,000
Liabilities: |  |
Liabilities | 12,717,000 | 20,970,000
Fair value measured on recurring basis | Level 2 |  |
Assets: |  |
Assets | 69,635,000 | 60,934,000
Liabilities: |  |
Liabilities | 68,164,000 | 49,102,000
Fair value measured on recurring basis | Level 2 | Commodity contracts |  |
Assets: |  |
Assets | 56,741,000 | 57,682,000
Liabilities: |  |
Liabilities | 55,926,000 | 44,732,000
Fair value measured on recurring basis | Level 2 | Foreign currency contracts |  |
Assets: |  |
Assets | 12,331,000 | 2,434,000
Liabilities: |  |
Liabilities | 10,385,000 | 3,845,000
Fair value measured on recurring basis | Level 2 | Inventories |  |
Assets: |  |
Assets | 563,000 | 818,000
Liabilities: |  |
Liabilities | 1,853,000 | 525,000
Fair value measured on recurring basis | Level 3 |  |
Liabilities: |  |
Liabilities | 89,000 |
Debt | 351,400,000 | 380,300,000
Notes receivable | 10,100,000 | 12,700,000
Fair value measured on recurring basis | Level 3 | Commodity contracts |  |
Liabilities: |  |
Liabilities | 89,000 |
Fair value measured on recurring basis | Sub-Total |  |
Assets: |  |
Assets | 91,416,000 | 79,021,000
Liabilities: |  |
Liabilities | 80,970,000 | 70,072,000
Fair value measured on recurring basis | Sub-Total | Commodity contracts |  |
Assets: |  |
Assets | 78,522,000 | 75,769,000
Liabilities: |  |
Liabilities | 68,732,000 | 65,702,000
Fair value measured on recurring basis | Sub-Total | Foreign currency contracts |  |
Assets: |  |
Assets | 12,331,000 | 2,434,000
Liabilities: |  |
Liabilities | 10,385,000 | 3,845,000
Fair value measured on recurring basis | Sub-Total | Inventories |  |
Assets: |  |
Assets | 563,000 | 818,000
Liabilities: |  |
Liabilities | 1,853,000 | 525,000
Fair value measured on recurring basis | Netting and Collateral |  |
Assets: |  |
Assets | (52,348,000) | (58,929,000)
Liabilities: |  |
Liabilities | (62,438,000) | (52,376,000)
Fair value measured on recurring basis | Netting and Collateral | Commodity contracts |  |
Assets: |  |
Assets | (42,995,000) | (56,115,000)
Liabilities: |  |
Liabilities | (53,085,000) | (49,562,000)
Fair value measured on recurring basis | Netting and Collateral | Foreign currency contracts |  |
Assets: |  |
Assets | (8,790,000) | (2,289,000)
Liabilities: |  |
Liabilities | (8,790,000) | (2,289,000)
Fair value measured on recurring basis | Netting and Collateral | Inventories |  |
Assets: |  |
Assets | (563,000) | (525,000)
Liabilities: |  |
Liabilities | (563,000) | (525,000)
Fair value measured on recurring basis | Total |  |
Assets: |  |
Assets | 39,068,000 | 20,092,000
Liabilities: |  |
Liabilities | 18,532,000 | 17,696,000
Fair value measured on recurring basis | Total | Commodity contracts |  |
Assets: |  |
Assets | 35,527,000 | 19,654,000
Liabilities: |  |
Liabilities | 15,647,000 | 16,140,000
Fair value measured on recurring basis | Total | Foreign currency contracts |  |
Assets: |  |
Assets | 3,541,000 | 145,000
Liabilities: |  |
Liabilities | 1,595,000 | 1,556,000
Fair value measured on recurring basis | Total | Inventories |  |
Assets: |  |
Assets |  | 293,000
Liabilities: |  |
Liabilities | $ 1,290,000 |

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- Definition Fair value as of the balance sheet date of customer securities accepted as collateral by the entity that it is permitted by contract or custom to sell or re-pledge to counterparties as collateral. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph a(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4/FIN46(R)-8 -Paragraph B6 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7523297&loc=SL6224234-111729 + Details
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- Definition The amount as of the balance sheet date of the fair value of derivative assets that in accordance with the entity's accounting policy was not offset against an obligation to return cash collateral under a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FIN39-1 -Paragraph 10B -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=7523297&loc=SL6224234-111729 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4/FIN46(R)-8 -Paragraph B6 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728 + Details
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