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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 | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Change in the investment in MSC |  |  |
Investment in MSC, beginning of period | $ 127,814 |  |
Income and mining tax recovery (note 19) | (3,844) | $ (2,770) | $ (15,369)
Dividend distribution received | (8,877) | (10,385) | (12,212)
Investment in MSC, end of period | 110,183 | 127,814 |
MSC |  |  |
Change in the investment in MSC |  |  |
Investment in MSC, beginning of period | 127,814 | 150,064 |
Attributable net loss from MSC | (2,097) | (10,065) | (2,328)
Amortization of fair value increments | (9,448) | (9,730) | (9,632)
Income and mining tax recovery (note 19) | 2,791 | 7,930 | 11,916
Dividend distribution received | (8,877) | (10,385) |
Investment in MSC, end of period | $ 110,183 | $ 127,814 | $ 150,064

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