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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, 2019 | Dec. 31, 2018
Disclosure of operating segments [line items] |  |
General and administrative | $ (31,752) | $ (22,649)
Exploration and project development | (11,684) | (11,138)
Mine care and maintenance | (23,662) | 0
Foreign exchange losses | (5,003) | (9,326)
Impairment charges (Note 13) | (40,050) | (27,789)
Gains on commodity and foreign currency contracts (Note 9) | 3,315 | 4,930
Gains on sale of mineral properties, plant and equipment (Note 12) | 3,858 | 7,973
Share of income from associate and dilution gain (Note 14) | 15,245 | 13,679
Transaction and integration costs (Note 8) | (7,515) | (10,229)
Other expense (Note 27) | (4,936) | (3,659)
Earnings from operations | 127,104 | 42,689
Loss on derivatives (Note 9) | (14) | (1,078)
Investment income (loss) | 84,704 | (284)
Interest and finance expense (Note 23) | (29,282) | (8,139)
Earnings before income taxes | 182,512 | 33,188
Mine operating segments [member] |  |
Disclosure of operating segments [line items] |  |
Earnings from operations | $ 229,288 | $ 100,897

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