Goodwill and Other Intangibles (Tables)

3 Months Ended

Mar. 31, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Goodwill

The following table summarizes the changes in goodwill by reportable segment for the three-month period ended March 31, 2024 (in thousands):

	Energy Storage		Specialties		Ketjen		Total
Balance at December 31, 2023	$	1,424,484	$	32,639	$	172,606	$	1,629,729
Foreign currency translation adjustments and other	(12,950)		(28)		(3,217)		(16,195)
Balance at March 31, 2024	$	1,411,534	$	32,611	$	169,389	$	1,613,534

Other Intangibles

The following table summarizes the changes in other intangibles and related accumulated amortization for the three-month period ended March 31, 2024 (in thousands):

	Customer Lists and Relationships		Trade Names and Trademarks(a)		Patents and Technology		Other		Total
Gross Asset Value
Balance at December 31, 2023	$	417,803	$	13,405	$	46,287	$	34,649	$	512,144
Retirements	—		(2,309)		(14,506)		(4,409)		(21,224)
Foreign currency translation adjustments and other	(6,236)		(227)		(519)		(927)		(7,909)
Balance at March 31, 2024	$	411,567	$	10,869	$	31,262	$	29,313	$	483,011
Accumulated Amortization
Balance at December 31, 2023	$	(204,481)	$	(3,673)	$	(26,758)	$	(15,374)	$	(250,286)
Amortization	(5,012)		—		(647)		(227)		(5,886)
Retirements	—		2,309		14,506		4,409		21,224
Foreign currency translation adjustments and other	2,956		40		360		336		3,692
Balance at March 31, 2024	$	(206,537)	$	(1,324)	$	(12,539)	$	(10,856)	$	(231,256)
Net Book Value at December 31, 2023	$	213,322	$	9,732	$	19,529	$	19,275	$	261,858
Net Book Value at March 31, 2024	$	205,030	$	9,545	$	18,723	$	18,457	$	251,755

(a)    Net Book Value includes only indefinite-lived intangible assets.