INCOME TAXES AFMC for CBPC exchange - Narrative (Details) (USD $)	3 Months Ended		9 Months Ended			12 Months Ended	3 Months Ended		12 Months Ended	3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2009 tax_credit	Dec. 31, 2009 Alternative Fuel Mixture Credit [Member]	Sep. 30, 2014 Cellulosic Biofuel Producer Credit [Member]	Jun. 30, 2014 Cellulosic Biofuel Producer 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
Expected income tax benefit										19,000,000
Valuation allowance	(990,000)	0	14,584,000	0				16,000,000
Valuation allowance, amount reversed							$ 1,000,000