INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Provision for doubtful accounts	$ 10,882	$ 11,544
Closure, post-closure and remedial liabilities	31,944	31,837
Operating lease liabilities	46,784	42,255
Accrued expenses	14,963	19,311
Accrued compensation and benefits	15,058	20,171
Net operating loss carryforwards	39,042	41,585
Tax credit carryforwards	6,531	8,903
Stock-based compensation	3,516	3,988
Other	4,843	7,487
Total deferred tax assets	173,563	187,081
Deferred tax liabilities:
Property, plant and equipment	(284,997)	(281,131)
Operating lease right-of-use assets	(46,584)	(41,939)
Interest rate swap asset	(9,576)	(17,587)
Permits and other intangible assets	(130,391)	(132,681)
Prepaid expenses	(12,372)	(12,088)
Total deferred tax liabilities	(483,920)	(485,426)
Total net deferred tax liability before valuation allowance	(310,357)	(298,345)
Less valuation allowance	(35,272)	(42,509)
Net deferred tax liabilities	(345,629)	$ (340,854)
State net operating loss carryforwards, begin to expire in 2023	229,900
Federal operating loss carryforwards, begin to expire in 2024	26,600
Foreign net operating loss carryforwards, begin to expire in 2023	83,200
Foreign tax credit carryforwards, begin to expire between 2023 and 2024	$ 4,400