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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE - Summary of Operating Results from MSC (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE |  |  |  |  |  |  |  |  |  |  |
Revenue from gold and silver sales |  |  |  |  |  |  |  |  | $ 136,541,000 | $ 104,789,000 | $ 117,019,000
Depreciation and depletion |  |  |  |  |  |  |  |  | (23,798,000) | (22,910,000) | (24,753,000)
Gross Profit | $ (5,897,000) | $ 344,000 | $ 4,059,000 | $ (4,986,000) | $ (13,687,000) | $ (701,000) | $ (8,875,000) | $ (3,685,000) | (6,480,000) | (26,948,000) | 8,986,000
Other expenses |  |  |  |  |  |  |  |  |  | (1,968,000) |
Net income before tax |  |  |  |  |  |  |  |  | (64,199,000) | (153,715,000) | (63,591,000)
Net income (loss) |  |  |  |  | $ (23,542,000) | $ (9,778,000) | $ (19,814,000) | $ (99,191,000) | (56,712,000) | (152,325,000) | (59,747,000)
Income tax recovery |  |  |  |  |  |  |  |  | 7,315,000 | 1,390,000 | 3,844,000
Loss from investment in MSC, net of amortization |  |  |  |  |  |  |  |  | $ (7,533,000) | (1,517,000) | (8,754,000)
Subsidiary (as a percent) |  |  |  |  |  |  |  |  | 100.00% |  |
Ownership interest (as a percent) | 49.00% |  |  |  |  |  |  |  | 49.00% |  |
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | $ 132,000 | 2,745,000 | (2,097,000)
Amortization of fair value increments |  |  |  |  |  |  |  |  | (8,331,000) | (5,390,000) | (9,448,000)
Income tax recovery |  |  |  |  |  |  |  |  | 666,000 | 1,128,000 | 2,791,000
Loss from investment in MSC, net of amortization |  |  |  |  |  |  |  |  | (7,533,000) | (1,517,000) | (8,754,000)
Minera Santa Cruz S.A. [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 132,000 | 2,745,000 |
Amortization of fair value increments |  |  |  |  |  |  |  |  | 8,331,000 | 5,390,000 |
Income tax recovery |  |  |  |  |  |  |  |  | (666,000) | (1,128,000) |
Shutdown costs |  |  |  |  |  |  |  |  | 19,300,000 | 11,400,000 |
Minera Santa Cruz S.A. [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE |  |  |  |  |  |  |  |  |  |  |
Revenue from gold and silver sales |  |  |  |  |  |  |  |  | 271,863,000 | 219,020,000 | 263,887,000
Production costs applicable to sales |  |  |  |  |  |  |  |  | (196,033,000) | (138,182,000) | (159,915,000)
Depreciation and depletion |  |  |  |  |  |  |  |  | (39,948,000) | (29,809,000) | (69,995,000)
Gross Profit |  |  |  |  |  |  |  |  | 35,882,000 | 51,029,000 | 33,977,000
Exploration |  |  |  |  |  |  |  |  | (10,602,000) | (10,446,000) | (10,635,000)
Other expenses (1) |  |  |  |  |  |  |  |  | (17,077,000) | (30,515,000) | (13,065,000)
Net income before tax |  |  |  |  |  |  |  |  | 8,203,000 | 10,068,000 | 10,277,000
Current and deferred tax expense |  |  |  |  |  |  |  |  | (7,934,000) | (4,466,000) | (14,556,000)
Net income (loss) |  |  |  |  |  |  |  |  | $ 269,000 | $ 5,602,000 | $ (4,279,000)
Ownership interest (as a percent) | 49.00% |  |  |  |  |  |  |  | 49.00% |  |

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