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Related-Party Transactions - Wholesale Motor Fuel Sales and Real Estate Rentals (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Related Party Transaction [Line Items]    
Rental income $ 22,688 $ 21,638
DMS [Member] | Fuel Sales Transaction [Member]    
Related Party Transaction [Line Items]    
Revenue from Related Parties 22,109 34,120
DMS [Member] | Rental Income [Member]    
Related Party Transaction [Line Items]    
Rental income $ 1,213 $ 1,946