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Supplemental Cash Flow Information - Changes in Operating Assets and Liabilities (Parenthetical) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule Of Supplemental Cash Flow [Line Items]      
Accounts payable to related parties [1] $ 4,517 $ (12,923) $ (1,853)
Amended and Restated Omnibus Agreement [Member] | Circle K Stores Inc. [Member]      
Schedule Of Supplemental Cash Flow [Line Items]      
Accounts payable to related parties   $ 14,200  
[1]

Change in 2019 includes a $14.2 million payment to Circle K as partial settlement of omnibus charges