REMEDIAL LIABILITIES (Tables)

12 Months Ended

Dec. 31, 2023

Environmental Remediation Obligations [Abstract]

Schedule of Changes to Remedial Liabilities

The changes to remedial liabilities from January 1, 2022 through December 31, 2023 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, 2022	$	1,780	$	59,787	$	50,306	$	111,873
Liabilities assumed in acquisition of real estate	—		—		8,092		8,092
Measurement period adjustments from prior period acquisition	—		—		338		338
Accretion	86		2,498		1,607		4,191
Changes in estimates recorded to consolidated statement of operations	8		877		612		1,497
Environmental expenditures	(50)		(3,370)		(5,375)		(8,795)
Currency translation and other	—		(43)		(863)		(906)
Balance at December 31, 2022	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
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

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

Anticipated payments at December 31, 2023 (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,
2024	$	13,898
2025	19,253
2026	9,006
2027	7,001
2028	7,767
Thereafter	71,737
Undiscounted remedial liabilities	128,662
Less: Discount at risk free rates	(17,419)
Total remedial liabilities	$	111,243

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, 2023 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 (24 facilities)	$	60,277	54.2	%	$	11,585
Facilities now used in active conduct of the Company's business (45 facilities)	43,299		38.9		9,080
Superfund sites (13 sites)	7,667		6.9		1,150
Total	$	111,243	100.0	%	$	21,815

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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, 2023 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	$	27,883	25.1	%	$	4,868
Bridgeport, NJ	Closed incinerator	17,472		15.7		3,288
Mercier, Quebec	Idled incinerator	11,501		10.3		1,735
Linden, NJ	Operating solvent recycling center	9,614		8.6		2,187
Various	All other incinerators, landfills, wastewater treatment facilities and service centers (65 facilities)	37,106		33.4		8,587
Various	Superfund sites (each representing less than 5% of total liabilities) (13 sites)	7,667		6.9		1,150
Total		$	111,243	100.0	%	$	21,815

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(1)$25.0 million of the $111.2 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.