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Income Taxes AFMC and CBPC (Details) (USD $) | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Income Tax Credits and Adjustments |  |  | $ 205,229,000
Alternative Fuel Mixture Credit [Member] |  |  |
Tax Credit Amount per Gallon |  |  | 0.50
Income Tax Credits and Adjustments | 0 | 0 | 205,229,000
Cellulosic Biofuel Producer Credit |  |  |
Tax Credit Amount per Gallon |  |  | 1.01
Income Tax Credits and Adjustments |  | 24,300,000 |
Exchange of Alternative Fuel Tax Benefit [Member] |  |  |
Income Tax Credits and Adjustments | $ 5,800,000 |  |

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- Definition A credit or adjustment for government or taxing authority authorized decrease in taxes owed as a result of meeting certain tax policy conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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