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Segment Reporting - Schedule of Reportable Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]                      
Total revenues $ 551,204 $ 591,022 $ 398,402 $ 391,695 $ 512,379 $ 559,736 $ 605,528 $ 471,786 $ 1,932,323 $ 2,149,429 $ 2,445,917
Rental income                 83,233 90,139 85,642
Income from CST Fuel Supply equity interests                 3,202 14,768 14,948
Operating income (loss) $ 8,139 $ 23,692 $ 6,329 $ 77,432 $ 9,441 $ 12,349 $ 13,920 $ 7,612 115,592 [1] 43,322 [1] 35,012 [1]
Fuel Sales to External Customers [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 1,718,825 2,007,021 2,259,288
Food and Merchandise Sales [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 123,295 47,875 93,872
Other Revenue [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues [2]                 6,970 4,394 7,115
Unallocated [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 (370,916) (306,070) (425,610)
Operating income (loss) [1]                 (9,193) (73,166) (91,265)
Unallocated [Member] | Fuel Sales to External Customers [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 (370,916) (306,070) (425,610)
Wholesale [Member] | Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 1,623,002 1,999,931 2,219,625
Rental income                 72,799 81,427 77,404
Income from CST Fuel Supply equity interests                 3,202 14,768 14,948
Operating income (loss) [1]                 123,457 113,299 117,848
Wholesale [Member] | Operating Segments [Member] | Fuel Sales to External Customers [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 1,176,943 1,609,547 1,713,227
Wholesale [Member] | Operating Segments [Member] | Other Revenue [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues [2]                 2,344 2,887 3,384
Wholesale [Member] | Intersegment [Member] | Fuel Sales to External Customers [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 370,916 306,070 425,610
Retail [Member] | Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 680,237 455,568 651,902
Rental income                 10,434 8,712 8,238
Operating income (loss) [1]                 1,328 3,189 8,429
Retail [Member] | Operating Segments [Member] | Fuel Sales to External Customers [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 541,882 397,474 546,061
Retail [Member] | Operating Segments [Member] | Food and Merchandise Sales [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 123,295 47,875 93,872
Retail [Member] | Operating Segments [Member] | Other Revenue [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues [2]                 $ 4,626 $ 1,507 $ 3,731
[1]

As discussed in Note 2, as a result of the adoption of ASC 842, operating income for 2020 and 2019 is not comparable to operating income for 2018. Most significantly, payments on our previous failed sale-leaseback obligations were characterized as principal and interest expense in periods prior to 2019. Starting in 2019, these payments are characterized as rent expense and thus reduce operating income. These payments for the Wholesale and Retail segments amounted to approximately $6.7 million and $0.5 million for 2018, respectively. Of the total payments, $5.5 million was classified as interest expense in 2018.
[2]

We reclassified revenues related to certain ancillary items such as car wash revenue, lottery commissions and ATM commissions from revenues from food and merchandise sales to other revenue to conform to the current year presentation, which amounted to $1.5 million and $3.7 million for 2019 and 2018, respectively.