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ASSET RETIREMENT OBLIGATIONS - Estimated Payments (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Estimated payments of asset retirement obligations: |  |  |
2023 | $ 7,559 |  |
2024 | 4,936 |  |
2025 | 1,935 |  |
2026 | 1,569 |  |
2027 | 3,182 |  |
Thereafter | 241,065 |  |
Aggregate undiscounted asset retirement obligations | 260,246 |  |
Effect of discounting | (110,433) | $ (98,300) |
Total asset retirement obligations | 149,813 | 131,099 | $ 127,898
Less: current portion | (7,559) |  |
Asset retirement obligations | 142,254 | 123,517 |
Surety bonds outstanding to performance of reclamation obligations | $ 174,300 | $ 173,900 |

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 25 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=116646717&loc=d3e6290-110844 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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