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ASSET RETIREMENT OBLIGATIONS - Estimated Payments (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Estimated payments of asset retirement obligations: |  |  |
2024 | $ 3,518 |  |
2025 | 5,557 |  |
2026 | 4,063 |  |
2027 | 7,038 |  |
2028 | 4,291 |  |
Thereafter | 242,134 |  |
Aggregate undiscounted asset retirement obligations | 266,601 |  |
Less: effect of discounting | (116,158) | $ (110,400) |
Total asset retirement obligations | 150,443 | 149,813 | $ 131,099
Less: current portion | (3,518) |  |
Asset retirement obligations | 146,925 | 142,254 |
Surety bonds outstanding to performance of reclamation obligations | $ 173,500 | $ 174,300 |

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