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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Change in the investment in MSC |  |  |
Investment in MSC, beginning balance | $ 150,064 |  |
Income tax recovery | (2,770) | $ (15,369) | $ (3,749)
Distributions received | (10,385) | (12,212) | (17,738)
Investment in MSC, ending balance | 127,814 | 150,064 |
MSC |  |  |
Change in the investment in MSC |  |  |
Investment in MSC, beginning balance | 150,064 | 162,320 |
Attributable net income (loss) from MSC | (10,065) | (2,328) | 15,961
Amortization of fair value increments | (9,730) | (9,632) | (12,274)
Income tax recovery | 7,930 | 11,916 | 9,264
Distributions received | (10,385) | (12,212) |
Investment in MSC, ending balance | $ 127,814 | $ 150,064 | $ 162,320

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