CLOSURE AND POST-CLOSURE LIABILITIES - Anticipated Payments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Environmental Property Sale, Disposal or Abandonment Costs
2023	$ 14,414
2024	14,733
2025	12,808
2026	8,369
2027	7,420
Thereafter	290,366
Undiscounted closure and post-closure liabilities	348,110
Less: Discount at credit-adjusted risk-free rate	(153,062)
Less: Undiscounted estimated closure and post-closure liabilities relating to airspace not yet consumed	(76,247)
Present value of closure and post-closure liabilities	$ 118,801	$ 99,103	$ 87,926