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OPERATING SEGMENT REPORTING - Geographic information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Operating Segment Reporting |  |  |  |  |  |
Revenue from gold and silver sales | $ 27,395 | $ 32,691 | $ 77,086 | $ 84,657 |  |
Long-lived Assets | 447,763 |  | 447,763 |  | $ 539,150 |
Investment in MSC | 108,762 |  | 108,762 |  | 110,183 |
Lease assets | 900 |  | 900 |  |  |
MSC |  |  |  |  |  |
Operating Segment Reporting |  |  |  |  |  |
Revenue from gold and silver sales | 70,195 | 74,530 | 154,666 | 189,348 |  |
Investment in MSC | 108,762 |  | 108,762 |  | 110,183 | $ 127,814
USA |  |  |  |  |  |
Operating Segment Reporting |  |  |  |  |  |
Revenue from gold and silver sales | 13,042 | 16,577 | 38,129 | 28,941 |  |
Long-lived Assets | 49,299 |  | 49,299 |  | 135,854 |
Canada |  |  |  |  |  |
Operating Segment Reporting |  |  |  |  |  |
Revenue from gold and silver sales | 10,352 | 11,147 | 27,257 | 36,139 |  |
Long-lived Assets | 78,161 |  | 78,161 |  | 77,147 |
Mexico |  |  |  |  |  |
Operating Segment Reporting |  |  |  |  |  |
Revenue from gold and silver sales | 4,001 | $ 4,967 | 11,700 | $ 19,577 |  |
Long-lived Assets | 20,051 |  | 20,051 |  | 23,551 |
Argentina |  |  |  |  |  |
Operating Segment Reporting |  |  |  |  |  |
Long-lived Assets | 300,252 |  | 300,252 |  | 302,598 |
Argentina | MSC |  |  |  |  |  |
Operating Segment Reporting |  |  |  |  |  |
Investment in MSC | $ 108,800 |  | $ 108,800 |  | $ 110,200 |

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