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INCOME TAXES AFMC for CBPC exchange Narrative (Details) (USD $)
 12 Months Ended 3 Months Ended
Dec. 31, 2009
tax_credit
Dec. 31, 2009
Alternative Fuel Mixture Credit [Member]
Dec. 31, 2009
Cellulosic Biofuel Producer Credit [Member]
Mar. 31, 2013
Exchange of Alternative Fuel Tax Benefit [Member]
gal
AFMC for CBPC Exchange [Line Items]        
Number of tax credits 2      
Tax Credit Amount per Gallon   $ 0.50 $ 1.01  
Tax payment       70,000,000
Gallons Exchanged       120,000,000
Income Tax Benefit       $ 19,000,000