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Acquisitions - Northwest Retail Acquisition (Details)
$ in Thousands
3 Months Ended
Mar. 23, 2018
USD ($)
gasoline_store_facility
Mar. 31, 2019
USD ($)
gasoline_store_facility
Mar. 31, 2018
USD ($)
Business Acquisition [Line Items]      
Number of retail gasoline, convenience store facilities | gasoline_store_facility   34  
Acquisition related costs | $   $ 2,884 $ 632
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    
Acquisition related costs | $     $ 600