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Equity Method Investments - Operating Results (Details) - Illinois Corn Processings LLC $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items] |
Net sales | $ 78,062
Cost of sales and expenses | (79,224)
Net loss | (1,162)
Depreciation and amortization | $ 1,720

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