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Supplementary Cash Flow Information
12 Months Ended
Dec. 31, 2020
Supplemental Cash Flow Elements [Abstract]  
Supplementary Cash Flow Information Supplementary Cash Flow Information
The net changes in non-cash working capital items are as follow:
Year ended December 31,
202020192018
Accounts receivable$(4,724)$(702)$(2,569)
Prepaids and other receivables(5,300)(10,509)(2,382)
Current portion of loans receivable— (4,585)— 
Inventory(28,094)(51,888)(4,092)
Accounts payable and other liabilities4,175 13,476 12,705 
Total$(33,943)$(54,208)$3,662