INCOME TAXES AFMC for CBPC exchange Narrative (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013 tax_credit	Sep. 30, 2012	Sep. 30, 2013 tax_credit	Sep. 30, 2012	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	Sep. 30, 2012 Exchange of Alternative Fuel Tax Benefit [Member] gal	Sep. 30, 2012 Exchange of Alternative Fuel Tax Benefit [Member] gal
AFMC for CBPC Exchange [Line Items]
Number of tax credits	2		2
Tax Credit Amount per Gallon					$ 0.50	$ 1.01
Gallons Exchanged							120,000,000	22,000,000	82,000,000
Income Tax Benefit							18,800,000	2,600,000	11,700,000
Interest expense	$ (13,031,000)	$ (8,253,000)	$ (30,768,000)	$ (36,133,000)				$ 3,400,000