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Supplementary cash flow information
 12 Months Ended
Dec. 31, 2019
Supplemental Statement of Cash Flow [Abstract]  
Supplementary cash flow information
23. Supplementary cash flow information
Changes in non-cash working capital:
December 31, 2019

 
December 31, 2018

 
 
 
 
Accounts receivable and other
$
6,029

 
$
(1,471
)
Inventories
(16,410
)
 
20,775

Accounts payable and accrued liabilities
25,637

 
(12,876
)
 
$
15,256

 
$
6,428