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Acquisitions - Northwest Retail Acquisition (Details)
3 Months Ended 9 Months Ended
Mar. 23, 2018
USD ($)
gasoline_store_facility
Sep. 30, 2019
USD ($)
gasoline_store_facility
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
gasoline_store_facility
Sep. 30, 2018
USD ($)
Business Acquisition [Line Items]          
Number of retail gasoline, convenience store facilities | gasoline_store_facility   34   34  
Acquisition related costs | $   $ 623,000 $ 2,134,000 $ 4,325,000 $ 3,515,000
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        
Cash consideration transferred | $ $ 74,500,000        
Acquisition related costs | $     $ 0   $ 600,000