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Supplemental Cash Flow Information - Changes in Operating Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Decrease (increase):    
Accounts receivable $ (2,512) $ 9,238
Accounts receivable from related parties (4) 2,612
Inventories (1,104) 1,840
Other current assets (1,359) 479
Other assets (892) (423)
Increase (decrease):    
Accounts payable 3,063 (10,498)
Accounts payable to related parties 529 482
Motor fuel and sales taxes payable 859 (2,402)
Accrued expenses and other current liabilities 733 (1,570)
Other long-term liabilities 3,574 (568)
Changes in operating assets and liabilities, net of acquisitions $ 2,887 $ (810)