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Supplementary cash flow information - Summary of change in cash flow information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Changes in non-cash working capital    
Accounts receivable and other $ (5,408) $ 6,685
Inventories (3,209) (16,410)
Accounts payable and accrued liabilities 43,386 25,637
Total $ 34,769 $ 15,912