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CLOSURE AND POST-CLOSURE LIABILITIES (Anticipated Payments) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Environmental Property Sale, Disposal or Abandonment Costs |  |  |
2021 | $ 14,941 |  |
2022 | 7,816 |  |
2023 | 16,181 |  |
2024 | 6,868 |  |
2025 | 5,628 |  |
Thereafter | 269,477 |  |
Undiscounted closure and post-closure liabilities | 320,911 |  |
Less: Discount at credit-adjusted risk-free rate | (159,164) |  |
Less: Undiscounted estimated closure and post-closure liabilities relating to airspace not yet consumed | (73,821) |  |
Present value of closure and post-closure liabilities | $ 87,926 | $ 75,651 | $ 69,931

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- Definition Undiscounted Closure and Post-Closure Liabilities + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- References No definition available. + Details
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