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Equity Method Investments - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jul. 03, 2017
Schedule of Equity Method Investments [Line Items]          
Equity method investments   $ 0 $ 0    
Return of equity method investment       $ 22,832,000  
Gain (loss) on equity method investments   0 0 11,381,000  
Equity method ownership percentage         30.00%
Equity method investment earnings   0 0 (348,000)  
Related party purchases   $ 0 $ 0 18,425,000  
ICP          
Schedule of Equity Method Investments [Line Items]          
Related party purchases       18,425,000  
Illinois Corn Processings LLC          
Schedule of Equity Method Investments [Line Items]          
Return of equity method investment $ 7,430,000        
Illinois Corn Processings LLC          
Schedule of Equity Method Investments [Line Items]          
Gain (loss) on equity method investments       11,381,000  
Related party sales to MGPI       $ 17,672,000