Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Goodwill

The following table sets forth the gross carrying value, accumulated amortization and net values of intangible assets and goodwill as of September 30, 2025 and December 31, 2024:

	September 30, 2025
(in thousands)	Amortization  life in years	Gross carrying amount		Accumulated amortization and other		Net carrying amount
Finite-lived assets:
AEC Trademarks and trade names	6-15	$	208	$	(205)	$	3
AEC Technology	10-15	6,528		(3,962)		2,566
AEC Intellectual property	15	1,250		(485)		765
AEC Customer relationships	8-15	69,559		(50,069)		19,490
Heimbach Developed technology	9	9,281		(2,461)		6,820
Total Finite-lived intangible assets		$	86,826	$	(57,182)	$	29,644
Indefinite-lived intangible assets:
Heimbach Trade name		$	6,454	$	—	$	6,454
MC Goodwill		69,871		—		69,871
AEC Goodwill		114,420		—		114,420
Total Indefinite-lived intangible assets:		$	190,745	$	—	$	190,745

	December 31, 2024
(in thousands)	Amortization  life in years	Gross carrying amount		Accumulated amortization and other		Net carrying amount
Finite-lived assets:
AEC Trademarks and trade names	6-15	$	208	$	(197)	$	11
AEC Technology	10-15	5,820		(3,140)		2,680
AEC Intellectual property	15	1,250		(422)		828
AEC Customer relationships	8-15	69,175		(47,283)		21,892
Heimbach Developed technology	9	8,547		(1,543)		7,004
Total Finite-lived assets		$	85,000	$	(52,585)	$	32,415
Indefinite-lived intangible assets:
Heimbach Trade name		$	5,712	$	—	$	5,712
MC Goodwill		63,988		—		63,988
AEC Goodwill		112,273		—		112,273
Total Indefinite-lived intangible assets:		$	181,973	$	—	$	181,973

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The changes in intangible assets, net and goodwill from December 31, 2024 to September 30, 2025, were as follows:

(in thousands)	December 31, 2024		Other Changes		Amortization		Currency Translation		September 30, 2025
Finite-lived intangible assets:
AEC Trademarks and trade names	$	11	$	—	$	(8)	$	—	$	3
AEC Technology	2,680		—		(462)		348		2,566
AEC Intellectual property	828		—		(63)		—		765
AEC Customer relationships	21,892		—		(2,626)		224		19,490
Heimbach Developed technology	7,004		(315)		(741)		872		6,820
Total Finite-lived intangible assets	$	32,415	$	(315)	$	(3,900)	$	1,444	$	29,644
Indefinite-lived intangible assets:
Heimbach Trade name	$	5,712	$	—	$	—	$	742	$	6,454
MC Goodwill	63,988		—		—		5,883		69,871
AEC Goodwill	112,273		—		—		2,147		114,420
Total Indefinite-lived assets:	$	181,973	$	—	$	—	$	8,772	$	190,745