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INCOME AND MINING TAXES - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Income Tax Disclosure [Abstract] |  |  |  |
Effective income tax rate reconciliation, rate (as a percent) | (5.40%) | (8.80%) |  |
Effective income tax rate reconciliation, statutory rate (as a percent) | 27.00% |  |  |
Unrecognized tax benefits | $ 0 | $ 1,980,000 | $ 0 | $ 8,574,000
Unrecognized tax benefits, income tax penalties and interest accrued | $ 0 |  | 0 |
Unrecognized tax benefits, release of income tax penalties and interest expense |  |  | (7,200,000) |
Unrecognized tax benefits, cash settlement |  |  | $ 1,400,000 |

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