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Segmented Information - Reconciliation of Segment Mine Operating Earnings to Company's Earnings Before Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of operating segments [line items] |  |
General and administrative | $ (36,375) | $ (31,752)
Exploration and project development | (7,096) | (11,684)
Mine care and maintenance (Note 23) | (102,105) | (23,662)
Foreign exchange losses | (5,474) | (5,003)
Impairments (Note 13) | 0 | (40,050)
Gains on commodity and foreign currency contracts (Note 9d) | 3,543 | 3,315
Gains on sale of mineral properties, plant and equipment | 7,922 | 3,858
Share of income from associate and dilution gain (Note 14) | 10,529 | 15,245
Transaction and integration costs (Note 8) | 0 | (7,515)
Other expense (Note 28) | (22,067) | (4,936)
Earnings from operations | 209,054 | 127,104
Gain (loss) on derivatives (Note 9d) | 38 | (14)
Investment income (Note 9b) | 63,024 | 84,704
Interest and finance expense (Note 24) | (20,104) | (29,282)
Earnings before income taxes | 252,012 | 182,512
Mine operating segments [member] |  |
Disclosure of operating segments [line items] |  |
Earnings from operations | $ 360,177 | $ 229,288

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