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Related-Party Transactions - Revenues from Wholesale Fuel Sales and Real Property Rental Income from Circle K (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Related Party Transaction [Line Items]    
Rental income $ 22,688 $ 21,638
Circle K Stores Inc. [Member] | Fuel Sales Transaction [Member]    
Related Party Transaction [Line Items]    
Revenue from Related Parties 29,224 33,315
Circle K Stores Inc. [Member] | Rental Income [Member]    
Related Party Transaction [Line Items]    
Rental income $ 2,669 $ 4,198