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Related Party Transactions - Revenues from Wholesale Fuel Sales and Real Property Rental Income from Circle K (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]      
Rental income $ 83,233 $ 90,139 $ 85,642
Circle K Stores Inc. [Member] | Fuel Sales Transaction [Member]      
Related Party Transaction [Line Items]      
Revenue from Related Parties 97,040 153,055 162,974
Circle K Stores Inc. [Member] | Rental Income [Member]      
Related Party Transaction [Line Items]      
Rental income $ 5,641 $ 13,898 $ 16,791