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Discontinued Operations (Summary of Results of Operations of Hereford) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]      
Income (loss) from discontinued operations $ 38,749 $ 20,903 $ 80,898
Hereford Production Facility [Member] | Discontinued Operations, Disposed of by Sale [Member]      
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]      
Ethanol sales 154,502 223,904 269,254
Total revenues 154,502 223,904 269,254
Ethanol cost of goods sold 121,753 158,276 228,899
Station and other operating expenses 27,881 34,763 33,227
Depreciation and amortization 333 147 77
Selling, general and administrative expenses 1,382 1,635 3,568
Total costs and operating expenses 151,349 194,821 265,771
Income from operations 3,153 29,083 3,483
Gain (loss) on sale of assets 60,782 0 0
Other nonoperating income (expense) 0 994 0
Total other income (expense) 60,782 994 0
Total income (loss) from discontinued operations before taxes 63,935 30,077 3,483
Income taxes 25,186 9,955 1,292
Income (loss) from discontinued operations $ 38,749 $ 20,122 $ 2,191