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Supplementary cash flow information - Summary of Change in Cash Flow Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Changes in non-cash working capital    
Accounts receivable and other $ 6,029 $ (1,471)
Inventories (16,410) 20,775
Accounts payable and accrued liabilities 25,637 (12,876)
Total $ 15,256 $ 6,428