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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE - Summary of Operating Results from MSC (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 128,822 | $ 67,724 | $ 60,388
Other operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | (82,035) | (48,571) | (16,908)
(Loss) income before income and mining taxes |  |  |  |  |  |  |  |  |  |  |  |  | (47,640) | (26,003) | 17,306
Net income | $ (20,989) | $ (13,290) | $ (5,380) | $ (5,211) | $ 2,169 | $ (8,072) | $ (1,712) | $ (3,018) | $ (4,491) | $ 4,208 | $ 8,353 | $ 12,985 | (44,870) | (10,634) | 21,055
Income tax recovery |  |  |  |  |  |  |  |  |  |  |  |  | (2,770) | (15,369) | (3,749)
(Loss) from investment in MSC, net of amortization |  |  |  |  |  |  |  |  |  |  |  |  | (11,865) | (44) | 12,951
MSC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of goods and services sold |  |  |  |  |  |  |  |  |  |  |  |  | (178,089) | (177,180) | (173,679)
Other operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | (21,083) | (20,956) | (21,770)
Other (expenses) income |  |  |  |  |  |  |  |  |  |  |  |  | (15,801) | (15,657) | 10,425
(Loss) income before income and mining taxes |  |  |  |  |  |  |  |  |  |  |  |  | (9,607) | 13,300 | 50,937
Current & deferred taxes |  |  |  |  |  |  |  |  |  |  |  |  | (10,934) | (18,050) | (18,363)
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 205,366 | 227,093 | 235,961
Net (loss) income |  |  |  |  |  |  |  |  |  |  |  |  | $ (20,541) | $ (4,750) | $ 32,574
MSC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) | 49.00% |  |  |  | 49.00% |  |  |  | 49.00% |  |  |  | 49.00% | 49.00% | 49.00%
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | $ (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
(Loss) from investment in MSC, net of amortization |  |  |  |  |  |  |  |  |  |  |  |  | $ (11,865) | $ (44) | $ 12,951
Corporate Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) | 100.00% |  |  |  | 100.00% |  |  |  | 100.00% |  |  |  | 100.00% | 100.00% | 100.00%

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