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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure of cash flow statement [Abstract]  
Changes in other operating activities
The following tables summarize other adjustments for non-cash income statement items, changes in operating working capital items and significant non-cash items: 
Other operating activities20202019
Adjustments for non-cash income statement items:
Share-based compensation expense$3,024 $4,448 
Gains on securities held(58,673)(83,705)
Gains on commodity and foreign currency contracts (Note 9d)(3,543)(3,315)
(Gain) loss on derivatives (Note 9d)(38)14 
Share of income from associate and dilution gain (Note 14)(10,529)(15,245)
Net realizable value adjustment for inventories(16,175)(356)
Project development write-down— 1,882 
$(85,934)$(96,277)
Changes in non-cash working capital
Changes in non-cash operating working capital items:20202019
Trade and other receivables$54,838 $1,545 
Inventories(14,623)22,753 
Prepaid expenses2,353 (4,093)
Accounts payable and accrued liabilities56,816 (43,527)
Provisions(2,402)(4,622)
 $96,982 $(27,944)
Schedule of significant non-cash items
Significant non-cash items:20202019
Share-based compensation issued to employees and directors$2,826 $2,693 
Cash and cash equivalents
Cash and Cash EquivalentsDecember 31,
2020		December 31,
2019
Cash in banks$167,113 $120,564