
	Environmental Services		Safety-Kleen Sustainability Solutions		Totals
Balance at January 1, 2026	$	1,297,478	$	181,572	$	1,479,050
Increase from current period acquisition	76,823		—		76,823


Foreign currency translation	(576)		(235)		(811)
Balance at March 31, 2026	$	1,373,725	$	181,337	$	1,555,062

The Company assesses goodwill for impairment on an annual basis as of December 31 or at an interim date when it is more likely than not that events or changes in the business environment (“triggering events”) would reduce the fair value of a reporting unit below its carrying value. During the period ended March 31, 2026, no such triggering events were identified.

As of March 31, 2026 and December 31, 2025, the Company’s intangible assets consisted of the following (in thousands):


	March 31, 2026						December 31, 2025
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	195,724	$	133,851	$	61,873	$	196,224	$	132,308	$	63,916
Customer and supplier relationships	720,514		284,028		436,486		698,381		292,813		405,568
Other intangible assets	121,009		60,085		60,924		121,030		57,438		63,592
Total amortizable permits and other intangible assets	1,037,247		477,964		559,283		1,015,635		482,559		533,076
Trademarks and trade names	119,798		—		119,798		119,951		—		119,951
Total permits and other intangible assets	$	1,157,045	$	477,964	$	679,081	$	1,135,586	$	482,559	$	653,027

Amortization expense of permits, customer and supplier relationships and other intangible assets was $13.7 million and $13.3 million in the three months ended March 31, 2026 and March 31, 2025, respectively.

The expected amortization of the net carrying amount of finite-lived intangible assets at March 31, 2026 was as follows (in thousands):


Years Ending December 31,	Expected Amortization
2026 (nine months)	$	41,795
2027	54,184
2028	52,816
2029	51,738
2030	41,163
Thereafter	317,587
	$	559,283