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Equity Method Investments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jul. 03, 2017
Schedule of Equity Method Investments [Line Items]      
Equity method investment earnings $ 0 $ 471  
ICP      
Schedule of Equity Method Investments [Line Items]      
Equity method ownership percentage     30.00%
Related party sales to MGPI   8,657  
Depreciation and amortization   858  
Equity method investment earnings   $ 471