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Supplementary cash flow information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Changes in non-cash working capital    
Accounts receivable and other $ 14,065 $ (5,408)
Inventories (16,087) (3,209)
Accounts payable and accrued liabilities (6,895) 42,008
Total $ (8,917) $ 33,391