Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2026

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

Changes in the carrying amount of goodwill for the three months ended March 31, 2026 are summarized as follows (dollars in thousands):

	Packaging		Specialty Products		Total
Balance, December 31, 2025	$	293,720	$	6,560	$	300,280
Foreign currency translation and other	(2,390)		—		(2,390)
Balance, March 31, 2026	$	291,330	$	6,560	$	297,890
Accumulated impairment losses at March 31, 2026	$	58,660	$	—	$	58,660

Schedule of Intangible Assets (excluding Goodwill) by Major Class

The Company amortizes its other intangible assets over periods ranging from one to 30 years. The gross carrying amounts and accumulated amortization of the Company's other intangibles are summarized below (dollars in thousands):

	As of March 31, 2026				As of December 31, 2025
Intangible Category by Useful Life	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Finite-lived intangible assets:
Customer relationships, 5 – 12 years	$	98,490	$	(72,600)	$	99,270	$	(71,810)
Customer relationships, 15 – 25 years	39,280		(39,280)		39,280		(39,280)
Total customer relationships	137,770		(111,880)		138,550		(111,090)
Technology and other, 1 – 15 years	13,580		(12,180)		13,630		(12,140)
Technology and other, 17 – 30 years	41,600		(39,820)		41,600		(39,740)
Total technology and other	55,180		(52,000)		55,230		(51,880)
Indefinite-lived intangible assets:
Trademark/Trade names	45,450		—		45,740		—
Total other intangible assets	$	238,400	$	(163,880)	$	239,520	$	(162,970)

Schedule of Finite-Lived Intangible Assets, Amortization Expense

Amortization expense related to intangible assets as included in the accompanying consolidated statement of income is summarized as follows (dollars in thousands):

	Three months ended March 31,
	2026		2025
Technology and other, included in cost of sales	$	180	$	170
Customer relationships, included in selling, general and administrative expenses	1,260		1,420
Total amortization expense	$	1,440	$	1,590