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Acquisitions - Northwest Retail Acquisition (Details)
$ in Thousands
12 Months Ended
Mar. 23, 2018
USD ($)
gasoline_store_facility
Dec. 31, 2019
USD ($)
gasoline_store_facility
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]        
Convenience store facilities | gasoline_store_facility   34    
Goodwill   $ 195,919 $ 153,397 $ 107,187
Acquisition and integration costs   $ 4,704 10,319 $ 395
Northwest Retail        
Business Acquisition [Line Items]        
Convenience store facilities | gasoline_store_facility 21      
Number of leased retail gasoline | gasoline_store_facility 12      
Payments to acquire businesses $ 74,500      
Goodwill 46,210      
Acquisition and integration costs     $ 600  
Retail | Northwest Retail        
Business Acquisition [Line Items]        
Goodwill $ 46,200