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Income Taxes AFMC and CBPC (Details) (USD $) | 12 Months Ended
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Dec. 31, 2009 Alternative Fuel Mixture Credit [Member] | Dec. 31, 2010 Cellulosic Biofuel Producer Credit | Dec. 31, 2009 Cellulosic Biofuel Producer Credit | Dec. 31, 2012 Exchange of Alternative Fuel Tax Benefit [Member] | Dec. 31, 2011 Exchange of Alternative Fuel Tax Benefit [Member]
Tax Credit Amount per Gallon | $ 0.50 |  | $ 1.01 |  |
Income Tax Credits and Adjustments | $ 205,200,000 | $ 24,300,000 |  | $ 12,200,000 | $ 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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: 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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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