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Equity Method Investments - Equity in Earnings (Loss) of Joint Ventures (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]              
Equity method investment earnings $ 0 $ 0 $ (819) $ 471 $ 0 $ (348) $ 4,036
Illinois Corn Processings LLC              
Schedule of Equity Method Investments [Line Items]              
Equity method investment earnings           (348) 4,069
D.M. Ingredients GmbH              
Schedule of Equity Method Investments [Line Items]              
Equity method investment earnings           $ 0 $ (33)