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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE - Changes in Company's Investment in MSC (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Change in the investment in MSC |  |  |  |  |
Investment in MSC, beginning of period |  |  | $ 110,183 |  |
Income tax recovery | $ 152 | $ 2,192 | 1,276 | $ 2,575 |
Dividend distribution received |  |  | (282) | (4,045) |
Investment in MSC, end of period | 108,762 |  | $ 108,762 |  | $ 110,183
Subsidiary (as a percent) |  |  | 100.00% |  |
MSC |  |  |  |  |
Change in the investment in MSC |  |  |  |  |
Investment in MSC, beginning of period |  |  | $ 110,183 | 127,814 | 127,814
Attributable net loss from MSC |  |  | 1,890 |  | (2,097)
Amortization of fair value increments |  |  | (3,891) |  | (9,448)
Income tax recovery |  |  | 862 |  | 2,791
Dividend distribution received |  |  | (282) |  | (8,877)
Investment in MSC, end of period | $ 108,762 |  | 108,762 |  | $ 110,183
Proceeds from Dividends Received |  | $ 2,000 | $ 300 | $ 4,000 |

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