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Related-Party Transactions - Schedule of Supplemental Income Statement Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 25, 2020
Mar. 31, 2019
Supplemental Income Statement Information [Line Items]      
Gross profit $ 35,729   $ 37,077
Net income $ 72,061   212
CST Brands Inc. [Member]      
Supplemental Income Statement Information [Line Items]      
Gross profit   $ 17,820 21,013
Net income   $ 17,476 $ 20,604