REMEDIAL LIABILITIES (Tables)

12 Months Ended

Dec. 31, 2024

Environmental Remediation Obligations [Abstract]

Schedule of Changes to Remedial Liabilities

The changes to remedial liabilities from January 1, 2023 through December 31, 2024 were as follows (in thousands):

	Remedial Liabilities for Landfill Sites		Remedial Liabilities for Inactive Sites		Remedial Liabilities (Including Superfund) for Non-Landfill Operations		Total
Balance at January 1, 2023	$	1,824	$	59,749	$	54,717	$	116,290
Accretion	89		2,540		1,561		4,190
Changes in estimates recorded to consolidated statement of operations	19		1,713		1,896		3,628
Environmental expenditures	(52)		(3,840)		(9,384)		(13,276)
Currency translation and other	—		115		296		411
Balance at December 31, 2023	1,880		60,277		49,086		111,243
Liabilities assumed in acquisitions	—		—		5,192		5,192
Accretion	92		2,292		1,514		3,898
Changes in estimates recorded to consolidated statement of operations	29		573		3,762		4,364
Expenditures	(53)		(6,078)		(5,715)		(11,846)
Currency translation and other	—		(28)		(1,078)		(1,106)
Balance at December 31, 2024	$	1,948	$	57,036	$	52,761	$	111,745

Schedule of Remedial Liabilities Anticipated Payments for Each of the Next Five Years

Anticipated payments at December 31, 2024 (based on current estimated costs and anticipated timing of necessary regulatory approvals to commence work on remedial activities) for each of the next five years and thereafter were as follows (in thousands):

Years ending December 31,
2025	$	10,321
2026	17,391
2027	11,259
2028	10,972
2029	8,745
Thereafter	70,610
Undiscounted remedial liabilities	129,298
Less: Discount at risk free rates	(17,553)
Total remedial liabilities	$	111,745

Schedule of Environmental Exit Costs by Cost

The following table presents the Company's estimated remedial liabilities and reasonably possible additional liabilities as of December 31, 2024 disaggregated by facility/site type (in thousands, except percentages):

Type of Facility or Site	Remedial Liabilities		% of Total		Reasonably Possible Additional Liabilities (1)
Inactive facilities not used in active conduct of the Company's business, most of which were assumed through prior period acquisitions (25 facilities)	$	56,976	51.0	%	$	10,765
Facilities now used in active conduct of the Company's business (62 facilities, including 24 acquired by the Company through acquisitions in 2024)	46,131		41.3		9,497
Superfund sites (12 sites)	8,638		7.7		1,296
Total	$	111,745	100.0	%	$	21,558

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(1)Amounts represent the high end of the range of management's best estimate of the reasonably possible additional liabilities.

The following table presents the Company's estimated remedial liabilities and reasonably possible additional liabilities as of December 31, 2024 disaggregated by facilities/sites which represent at least 5% of the total and with all other facilities/ sites combined (in thousands, except percentages):

Location	Type of Facility or Site	Remedial Liabilities(1)		% of Total		Reasonably Possible Additional Liabilities(2)
Baton Rouge, LA	Closed incinerator and landfill	$	25,578	22.9	%	$	4,303
Bridgeport, NJ	Closed incinerator	17,417		15.6		3,254
Mercier, Quebec	Idled incinerator	10,826		9.7		1,631
Linden, NJ	Operating solvent recycling center	9,434		8.4		2,148
Various	All other incinerators, landfills, wastewater treatment facilities and service centers (83 facilities, including 24 acquired by the Company through acquisitions in 2024)	39,852		35.7		8,926
Various	Superfund sites (each representing less than 5% of total liabilities) (12 sites)	8,638		7.7		1,296
Total		$	111,745	100.0	%	$	21,558

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(1)$23.3 million of the $111.7 million remedial liabilities include estimates related to the legal and administrative proceedings discussed in Note 18, "Commitments and Contingencies."

(2)Amounts represent the high end of the range of management's best estimate of the reasonably possible additional liabilities.