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Alternative Energy Tax Credits (Details) (USD $) | 3 Months Ended |  |  | 3 Months Ended | 12 Months Ended | 24 Months Ended | 3 Months Ended | 12 Months Ended |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2010 Alternative Fuel Mixture Credits [Member] | Sep. 30, 2010 Alternative Fuel Mixture Credits [Member] | Dec. 31, 2011 Alternative Fuel Mixture Credits [Member] | Dec. 31, 2009 Alternative Fuel Mixture Credits [Member] | Dec. 31, 2009 Alternative Fuel Mixture Credits [Member] | Dec. 31, 2010 Cellulosic Biofuel Tax Credits [Member] | Sep. 30, 2010 Cellulosic Biofuel Tax Credits [Member] | Dec. 31, 2011 Cellulosic Biofuel Tax Credits [Member] | Jun. 30, 2010 Cellulosic Biofuel Tax Credits [Member] | Dec. 31, 2010 Amended 2009 Federal Return [Member]
Alternative Energy Tax Credits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Refundable tax credit per gallon |  |  |  |  |  |  | $ 0.50 | $ 0.50 |  |  |  | $ 1.01 |
Alternative fuels produced claimed for alternative energy tax credits |  |  |  |  |  | 33.00% |  |  |  |  | 66.00% |  |
Alternative fuel mixture released reserve | 9,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Increase in net income due to reserve release | 9,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Additional expenses |  |  |  |  |  |  |  |  |  | 800,000 |  |  |
Additional expenses, net of tax |  |  |  |  |  |  |  |  |  | 500,000 |  |  |
Cellulosic biofuel producer credits |  |  |  |  |  |  |  |  |  |  |  |  | 107,000,000
Alternative energy tax credits |  |  |  | 16,400,000 | (111,900,000) |  |  | 185,400,000 | 5,000,000 | 33,400,000 |  |  |
Alternative fuel mixture credits |  |  |  |  |  |  | 185,400,000 |  |  |  |  |  |
Cellulosic biofuel tax credit income impact |  |  |  |  |  |  |  |  |  | 145,800,000 |  |  |
Uncertain tax positions |  |  | 102,000,000 |  |  |  |  |  |  |  |  |  |
Tax credits used to offset future cash tax payment |  | $ 167,500,000 |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the net income impact from the alternative energy tax credits. + References No definition available. + Details
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- Definition Represents the cellulosic biofuel producer credits before any reserves for uncertain tax positions. + References No definition available. + Details
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- Definition Represents alternative fuel mixture credits. + References No definition available. + Details
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- Definition Represents the amount of cellulosic biofuel producer credits recorded in provision (benefit) for income taxes. + References No definition available. + Details
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- Definition Represents the increase or decrease during the period in the reserve for uncertain tax positions. + References No definition available. + Details
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- Definition Represents increase in net income due to release of reserve recorded due to the ambiguity of the calculation of the tax credit. + References No definition available. + Details
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- Definition Represents expenses, net of tax, charged against earnings in the period of an event that is infrequent in occurrence or unusual in nature. + References No definition available. + Details
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- Definition Percentage of Alternative Fuel Produced, Claimed for Tax Credit + References No definition available. + Details
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- Definition Expenses charged against earnings in the period of an event that is infrequent in occurrence or unusual in nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6365513&loc=d3e15122-107781 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 48 -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 109 -Paragraph 17 -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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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