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Supplementary cash flow information
12 Months Ended
Dec. 31, 2020
Supplemental Statement of Cash Flow [Abstract]  
Supplementary cash flow information
22. Supplementary cash flow information
Changes in non-cash working capital:December 31, 2020December 31, 2019
Accounts receivable and other$(5,408)$6,685 
Inventories(3,209)(16,410)
Accounts payable and accrued liabilities43,386 25,637 
$34,769 $15,912