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Related Party Transactions - Wholesale Motor Fuel Sales and Real Estate Rentals (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]      
Revenue from Related Parties $ 297,568 $ 433,740 $ 414,781
Rental income 90,139 85,642 86,314
DMS [Member] | Fuel Sales Transaction [Member]      
Related Party Transaction [Line Items]      
Revenue from Related Parties 142,236 241,151 241,895
DMS [Member] | Rental Income [Member]      
Related Party Transaction [Line Items]      
Rental income $ 6,326 $ 12,569 $ 18,753