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CLOSURE AND POST-CLOSURE LIABILITIES - Anticipated Payments (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Environmental Property Sale, Disposal or Abandonment Costs |  |  |
2025 | $ 10,304 |  |
2026 | 14,457 |  |
2027 | 12,485 |  |
2028 | 14,127 |  |
2029 | 3,224 |  |
Thereafter | 278,762 |  |
Undiscounted closure and post-closure liabilities | 333,359 |  |
Less: Discount at credit-adjusted risk-free rate | (119,353) |  |
Less: Undiscounted estimated closure and post-closure liabilities relating to airspace not yet consumed | (84,218) |  |
Present value of closure and post-closure liabilities | $ 129,788 | $ 118,600 | $ 118,801

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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 -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481999/410-20-25-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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