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CLOSURE AND POST-CLOSURE LIABILITIES (Anticipated Payments) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Environmental Property Sale, Disposal or Abandonment Costs |  |  |
2018 | $ 6,313 |  |
2019 | 8,957 |  |
2020 | 12,152 |  |
2021 | 8,652 |  |
2022 | 353 |  |
Thereafter | 285,404 |  |
Undiscounted closure and post-closure liabilities | 321,831 |  |
Less: Discount at credit-adjusted risk-free rate | (161,767) |  |
Less: Undiscounted estimated closure and post-closure liabilities relating to airspace not yet consumed | (99,027) |  |
Present value of closure and post-closure liabilities | $ 61,037 | $ 58,331 | $ 56,249

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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/presentationRef -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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