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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

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