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ASSET RETIREMENT OBLIGATIONS - Estimated Payments (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Estimated payments of asset retirement obligations: |  |  |
2020 | $ 4,496 |  |
2021 | 2,576 |  |
2022 | 2,794 |  |
2023 | 2,027 |  |
2024 | 2,986 |  |
Thereafter | 225,584 |  |
Aggregate undiscounted asset retirement obligations | 240,463 |  |
Effect of discounting | (102,949) | $ (100,300) |
Total asset retirement obligations | 137,514 | 137,114 | $ 130,600
Less: current portion | (4,496) |  |
Asset retirement obligations | 133,018 | 127,655 |
Surety bonds outstanding to performance of reclamation obligations | $ 181,600 | $ 169,300 |

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