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