GOODWILL AND OTHER INTANGIBLE ASSETS

9 Months Ended

Sep. 30, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in goodwill by segment for the nine months ended September 30, 2025 were as follows (in thousands):


	Environmental Services		Safety-Kleen Sustainability Solutions		Totals
Balance at January 1, 2025	$	1,296,204	$	180,995	$	1,477,199

Measurement period adjustments from prior period acquisitions	146		(99)		47

Foreign currency translation	1,130		455		1,585
Balance at September 30, 2025	$	1,297,480	$	181,351	$	1,478,831

The Company assesses goodwill on an annual basis as of December 31 or at an interim date when events or changes in the business environment (“triggering events”) would more likely than not reduce the fair value of a reporting unit below its carrying value. During the period ended September 30, 2025, no such triggering events were identified.

As of September 30, 2025 and December 31, 2024, the Company’s intangible assets consisted of the following (in thousands):


	September 30, 2025						December 31, 2024
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	194,193	$	130,053	$	64,140	$	191,921	$	123,939	$	67,982
Customer and supplier relationships	698,036		283,708		414,328		697,326		256,657		440,669
Other intangible assets	120,404		54,714		65,690		120,316		46,490		73,826
Total amortizable permits and other intangible assets	1,012,633		468,475		544,158		1,009,563		427,086		582,477
Trademarks and trade names	119,807		—		119,807		119,510		—		119,510
Total permits and other intangible assets	$	1,132,440	$	468,475	$	663,965	$	1,129,073	$	427,086	$	701,987

Amortization expense of permits, customer and supplier relationships and other intangible assets was $13.4 million and $40.5 million in the three and nine months ended September 30, 2025, respectively. Amortization expense of permits, customer and supplier relationships and other intangible assets was $13.9 million and $40.7 million in the three and nine months ended September 30, 2024, respectively.

The expected amortization of the net carrying amount of finite-lived intangible assets at September 30, 2025 was as follows (in thousands):


Years Ending December 31,	Expected Amortization
2025 (three months)	$	13,379
2026	51,727
2027	49,190
2028	47,708
2029	42,097
Thereafter	340,057
	$	544,158