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Segment Reporting - Summary of Receivables Relating to Revenue Streams (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]    
Total accounts receivable $ 36,184 $ 29,450
Receivables from Fuel and Merchandise Sales [Member]    
Segment Reporting Information [Line Items]    
Total accounts receivable 30,183 23,800
Receivables for Rent and Other Lease-related Charges [Member]    
Segment Reporting Information [Line Items]    
Total accounts receivable $ 6,001 $ 5,650