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ASSET RETIREMENT OBLIGATIONS - Estimated Payments (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Estimated payments of asset retirement obligations: |  |  |
2021 | $ 6,411 |  |
2022 | 2,723 |  |
2023 | 2,570 |  |
2024 | 3,317 |  |
2025 | 4,601 |  |
Thereafter | 210,330 |  |
Aggregate undiscounted asset retirement obligations | 229,952 |  |
Effect of discounting | (102,054) | $ (102,900) |
Total asset retirement obligations | 127,898 | 137,514 | $ 137,114
Less: current portion | (6,411) |  |
Non-current asset retirement obligations | 121,487 | 133,018 |
Surety bonds outstanding to performance of reclamation obligations | $ 171,100 | $ 181,600 |

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