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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE |  |  |  |  |  |  |  |  |  |  |
Revenue from gold and silver sales |  |  |  |  |  |  |  |  | $ 117,019 | $ 128,175 | $ 67,465
Gross Profit | $ 1,261 | $ 1,619 | $ 4,677 | $ 1,429 | $ 2,749 | $ 6,013 | $ 9,092 | $ 14,228 | 8,986 | 32,082 | 20,080
Net income (loss) before tax |  |  |  |  |  |  |  |  | (63,591) | (47,640) | (26,003)
Net loss | $ (25,132) | $ (11,465) | $ (13,014) | $ (10,136) | $ (20,989) | $ (13,290) | $ (5,380) | $ (5,211) | (59,747) | (44,870) | (10,634)
Income and mining tax recovery (note 19) |  |  |  |  |  |  |  |  | $ (3,844) | (2,770) | (15,369)
Subsidiary (as a percent) |  |  |  |  |  |  |  |  | 100.00% |  |
Ownership interest (as a percent) | 49.00% |  |  |  |  |  |  |  | 49.00% |  |
(Loss) from investment in MSC, net of amortization |  |  |  |  |  |  |  |  | $ (8,754) | (11,865) | (44)
MSC |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE |  |  |  |  |  |  |  |  |  |  |
Revenue from gold and silver sales |  |  |  |  |  |  |  |  | 263,887 | 213,096 | 235,650
Production costs applicable to sales |  |  |  |  |  |  |  |  | (159,915) | (151,779) | (156,347)
Depreciation and depletion |  |  |  |  |  |  |  |  | (69,995) | (52,200) | (48,278)
Gross Profit |  |  |  |  |  |  |  |  | (33,977) | (9,117) | (31,025)
Exploration |  |  |  |  |  |  |  |  | (10,635) | (5,884) | (5,198)
Other expenses |  |  |  |  |  |  |  |  | (13,065) | (12,840) | (12,527)
Net income (loss) before tax |  |  |  |  |  |  |  |  | 10,277 | (9,607) | 13,300
Current and deferred tax expense |  |  |  |  |  |  |  |  | (14,556) | (10,934) | (18,050)
Net loss |  |  |  |  |  |  |  |  | (4,279) | (20,541) | (4,750)
Net income (loss) |  |  |  |  |  |  |  |  | (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
Loss from investment in MSC, net of amortization |  |  |  |  |  |  |  |  | $ (8,754) | $ (11,865) | $ (44)
Summarized key financial information (as a percent) |  |  |  |  |  |  |  |  | 100.00% |  |
Ownership interest (as a percent) | 49.00% |  |  |  |  |  |  |  | 49.00% |  |

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