The changes in the carrying amount of goodwill by reportable segment are as follows (in thousands):


	Fire Safety		Specialty Products		Total
Balance, December 31, 2024	$	852,754	$	181,789	$	1,034,543
Purchase price allocation and measurement period adjustments for business combinations	—		1,718		1,718
Foreign currency translation	12,268		5,249		17,517
Balance, September 30, 2025	$	865,022	$	188,756	$	1,053,778

Intangible assets and related accumulated amortization as of September 30, 2025 and December 31, 2024 are as follows (in thousands):


	September 30, 2025
	Estimated Useful Life (in years)			Gross Value		Accumulated Impairment		Foreign Currency Translation		Accumulated Amortization		Net Book Value
Definite Lived Intangible Assets:
Customer lists	10	to	20	$	773,000	$	—	$	(5,511)	$	(146,853)	$	620,636
Technology and patents (1)	4	to	20	275,426		(40,738)		(814)		(50,762)		183,112
Tradenames	10	to	20	104,900		—		(942)		(19,492)		84,466
Balance, September 30, 2025				$	1,153,326	$	(40,738)	$	(7,267)	$	(217,107)	$	888,214

(1) In May 2025, the Company settled its trade secret litigation with a subsidiary of Compass Minerals International, Inc. and simultaneously acquired related intangible assets, property, plant and equipment, and inventories. The total purchase consideration for the asset acquisition was $20.0 million in cash, of which $15.2 million was allocated to the technology-

related intangible assets. The acquired technology-related intangible assets will be amortized on a straight-line basis over its estimated useful life of 4 years.


			December 31, 2024
	Estimated Useful Life (in years)			Gross Value		Accumulated Impairment		Foreign Currency Translation		Accumulated Amortization		Net Book Value
Definite Lived Intangible Assets:
Customer lists	10	to	20	$	767,000	$	—	$	(10,659)	$	(118,596)	$	637,745
Technology and patents	10	to	20	257,100		(40,738)		(4,187)		(38,868)		173,307
Tradenames	10	to	20	104,500		—		(1,393)		(15,742)		87,365
Balance, December 31, 2024				$	1,128,600	$	(40,738)	$	(16,239)	$	(173,206)	$	898,417

Amortization expense for definite-lived intangible assets was $15.2 million and $43.9 million for the three and nine months ended September 30, 2025 respectively, and $13.8 million and $41.3 million, for the three and nine months ended September 30, 2024, respectively.

Estimated annual amortization expense of intangible assets for the next five years ended December 31, and thereafter is as follows (in thousands):


	Amount
2025 remaining	$	14,977
2026	59,907
2027	59,907
2028	59,907
2029	57,686
Thereafter	635,830
Total	$	888,214