CLOSURE AND POST-CLOSURE LIABILITIES

12 Months Ended

Dec. 31, 2023

Asset Retirement Obligation Disclosure [Abstract]

CLOSURE AND POST-CLOSURE LIABILITIES

CLOSURE AND POST-CLOSURE LIABILITIES

The changes to closure and post-closure liabilities (also referred to as "asset retirement obligations") from January 1, 2022 through December 31, 2023 were as follows (in thousands):

	Landfill Retirement Liability		Non-Landfill Retirement Liability		Total
Balance at January 1, 2022	$	53,425	$	45,678	$	99,103
Liabilities assumed in acquisitions	—		55		55
Measurement period adjustments from prior period acquisitions	—		1,148		1,148
New asset retirement obligations	3,743		—		3,743
Accretion	4,605		4,147		8,752
Changes in estimates recorded to consolidated statement of operations	1,063		5,712		6,775
Changes in estimates recorded to consolidated balance sheet	3,219		1,742		4,961
Environmental expenditures	(3,373)		(1,778)		(5,151)
Currency translation and other	(431)		(154)		(585)
Balance at December 31, 2022	62,251		56,550		118,801
Liabilities assumed in acquisitions	—		574		574
Measurement period adjustments from prior period acquisitions	—		3,015		3,015
New asset retirement obligations	3,092		—		3,092
Accretion	4,958		4,519		9,477
Changes in estimates recorded to consolidated statement of operations	1,147		53		1,200
Changes in estimates recorded to consolidated balance sheet	(3,706)		1,600		(2,106)
Environmental expenditures	(8,478)		(7,206)		(15,684)
Currency translation and other	179		52		231
Balance at December 31, 2023	$	59,443	$	59,157	$	118,600

During the first quarter of 2023, the Company's non-commercial landfill at the Deer Park, Texas incineration facility reached its permitted capacity, as expected. The Company has commenced closure activities; however, there have been no changes to the liabilities related to this location. In the year ended December 31, 2023, there were no significant benefits or charges resulting from changes in estimates for closure and post-closure liabilities.

Anticipated payments (based on current estimated costs and anticipated timing of necessary regulatory approvals to commence work on closure and post-closure activities) for each of the next five years and thereafter are as follows (in thousands):

Years ending December 31,
2024	$	15,698
2025	16,694
2026	14,750
2027	3,955
2028	13,628
Thereafter	252,110
Undiscounted closure and post-closure liabilities	316,835
Less: Discount at credit-adjusted risk-free rate	(114,325)
Less: Undiscounted estimated closure and post-closure liabilities relating to airspace not yet consumed	(83,910)
Present value of closure and post-closure liabilities	$	118,600