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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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Change in the investment in MSC |  |  |
Investment in MSC, beginning of period | $ 108,326 |  |
Income tax recovery | 2,015 | $ 1,094 |
Dividend distribution received | (4,984) |  |
Investment in MSC, end of period | 102,768 |  | $ 108,326
MSC |  |  |
Change in the investment in MSC |  |  |
Investment in MSC, beginning of period | 108,326 | $ 110,183 | 110,183
Attributable net income from MSC | 285 |  | 2,745
Amortization of fair value increments | (1,071) |  | (5,390)
Income tax recovery | 212 |  | 1,128
Dividend distribution received | (4,984) |  | (340)
Investment in MSC, end of period | 102,768 |  | $ 108,326
Proceeds from Dividends Received | $ 5,000 |  |

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