Summary Of Significant Accounting Policies (Schedule Of Estimated Useful Lives Of Assets) (Details)	12 Months Ended
	Dec. 31, 2012
Plant, Buildings And Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	40
Plant, Buildings And Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	10
Ethanol Production Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	40
Ethanol Production Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	15
Other Machinery And Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	7
Other Machinery And Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	5
Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	20
Railroad Track And Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	20
Computer And Software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	5
Computer And Software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	3
Office Furniture And Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	7
Office Furniture And Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	5