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Acquisitions - Additional Information (Details)
3 Months Ended 9 Months Ended
Mar. 23, 2018
USD ($)
gasoline_store_facility
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]            
Goodwill   $ 153,397,000   $ 153,397,000   $ 107,187,000
Acquisition related costs   2,134,000 $ 0 3,515,000 $ 253,000  
Northwest Retail Acquisition            
Business Acquisition [Line Items]            
Number of retail gasoline, convenience store facilities | gasoline_store_facility 21          
Number of leased retail gasoline, convenience store facilities | gasoline_store_facility 12          
Consideration transferred $ 75,000,000          
Goodwill $ 46,210,000          
Initial accounting incomplete, adjustment, decrease to intangibles   3,300,000        
Initial accounting incomplete, adjustment, decrease to other noncurrent liabilities   800,000        
Initial accounting incomplete, adjustment, increase to goodwill   2,500,000        
Acquisition related costs   $ 0   $ 600,000