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Equity Method Investments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jul. 03, 2017
Schedule of Equity Method Investments [Line Items]          
Equity method investment loss $ 0 $ 0 $ 0 $ (348)  
Gain on sale of equity method investment $ 0 11,381 $ 0 11,381  
ICP          
Schedule of Equity Method Investments [Line Items]          
Equity method ownership percentage         30.00%
Related party sales to MGPI   0   17,672  
Depreciation and amortization   0   1,720  
Equity method investment loss   $ 0   $ (348)