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Equity Method Investments - Operating Results (Details) - Illinois Corn Processings LLC - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |
Net sales | $ 78,062 | $ 177,401
Cost of sales and expenses | (79,224) | (163,837)
Net income (loss) | $ (1,162) | $ 13,564

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