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Equity Method Investments (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 28, 2017
Dec. 23, 2016
Feb. 26, 2016
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jul. 03, 2017
Sep. 01, 2015
Schedule of Equity Method Investments [Line Items]                          
Return of equity method investment                 $ 22,832,000        
Gain (loss) on equity method investments         $ 0 $ 11,381,000 $ 0 $ 0 11,381,000 $ 0 $ 0    
Distribution received from equity method investee                 7,131,000 3,300,000 0    
Divestiture of equity method investment, net                 22,832,000 351,000 0    
Equity method investment, other than temporary impairment                 0 0 0    
Related party expenses                 17,672,000 27,675,000 38,941,000    
Proceeds from business interruption insurance recoveries                     4,112,000    
Illinois Corn Processings LLC                          
Schedule of Equity Method Investments [Line Items]                          
Return of equity method investment $ 830,000 $ 6,600,000                      
Illinois Corn Processings LLC                          
Schedule of Equity Method Investments [Line Items]                          
Equity method ownership percentage       30.00%               30.00% 30.00%
Gain (loss) on equity method investments                 11,381,000        
Distribution received from equity method investee $ 830,000 $ 6,600,000   $ 3,300,000                  
Depreciation and amortization                 $ 1,720,000 $ 3,030,000 $ 2,634,000    
D.M. Ingredients GmbH                          
Schedule of Equity Method Investments [Line Items]                          
Equity method ownership percentage                     50.00%    
Divestiture of equity method investment, net     $ 351,000