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Related-Party Transactions - Wholesale Motor Fuel Sales and Real Estate Rentals (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Related Party Transaction [Line Items]        
Rental income $ 20,862 $ 20,424 $ 41,334 $ 43,112
DMS [Member] | Fuel Sales Transaction [Member]        
Related Party Transaction [Line Items]        
Revenue from Related Parties 7,125   29,234  
DMS [Member] | Rental Income [Member]        
Related Party Transaction [Line Items]        
Rental income $ 183   $ 1,395