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Acquisitions - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 23, 2018
Dec. 31, 2017
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment [Abstract]      
Goodwill $ 153,397   $ 107,187
Northwest Retail Acquisition      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment [Abstract]      
Cash   $ 200  
Inventories   4,138  
Prepaid and other assets   243  
Property, plant, and equipment   30,230  
Goodwill   46,210  
Accounts payable and other current liabilities   (759)  
Long-term debt obligations   (5,244)  
Other non-current liabilities   (487)  
Total   74,531  
Northwest Retail Acquisition | Retail      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment [Abstract]      
Goodwill   $ 46,200