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Supplemental Cash Flow Information - Changes in Operating Assets and Liabilities (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Decrease (increase):    
Accounts receivable $ (6,741) $ 178
Accounts receivable from related parties (216) 977
Inventories (1,121) 1,725
Other current assets (2,682) (3,204)
Other assets (1,379) (1,257)
Increase (decrease):    
Accounts payable [1] 6,940 10,473
Accounts payable to related parties 939 4,158
Motor fuel and sales taxes payable [2] 2,585 13,104
Accrued expenses and other current liabilities 1,541 2,048
Other long-term liabilities 2,275 (1,071)
Changes in operating assets and liabilities, net of acquisitions $ 2,141 $ 27,131
[1]

change in 2020 driven by initial build of accounts payable balance after closing on the acquisition of wholesale and retail assets
[2]

change in 2020 driven by timing on one motor fuel tax payment that reversed later in 2020