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Acquisitions - Northwest Retail Acquisition (Details)
$ in Thousands
12 Months Ended
Mar. 23, 2018
USD ($)
Jan. 09, 2018
gasoline_convenience_store_facility
Dec. 31, 2020
USD ($)
gasoline_convenience_store_facility
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]          
Convenience store facilities | gasoline_convenience_store_facility     34    
Acquisition and integration costs | $     $ 614 $ 4,704 $ 10,319
Northwest Retail          
Business Acquisition [Line Items]          
Convenience store facilities | gasoline_convenience_store_facility   21      
Number of leased retail gasoline | gasoline_convenience_store_facility   12      
Payments to acquire businesses | $ $ 74,500        
Acquisition and integration costs | $         $ 600