Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

Changes in the carrying amount of goodwill for the years ended December 31, 2023 and 2022 are as follows (dollars in thousands):

					Specialty
	Packaging		Aerospace		Products		Total
Balance, December 31, 2021	$	238,740	$	70,190	$	6,560	$	315,490
Goodwill from acquisitions	32,370		—		—		32,370
Foreign currency translation and other	(7,560)		(490)		—		(8,050)
Balance, December 31, 2022	$	263,550	$	69,700	$	6,560	$	339,810
Goodwill from acquisitions	20,420		—		—		20,420
Foreign currency translation and other	3,380		160		—		3,540
Balance, December 31, 2023	$	287,350	$	69,860	$	6,560	$	363,770

Schedule of Intangible Assets (excluding Goodwill) by Major Class

The gross carrying amounts and accumulated amortization of the Company's other intangibles as of December 31, 2023 and 2022 are summarized below (dollars in thousands):

	As of December 31, 2023				As of December 31, 2022
Intangible Category by Useful Life	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Finite-lived intangible assets:
Customer relationships, 5 - 12 years	$	141,260	$	(89,020)	$	131,660	$	(80,000)
Customer relationships, 15 - 25 years	129,830		(80,600)		129,650		(74,380)
Total customer relationships	271,090		(169,620)		261,310		(154,380)
Technology and other, 1 - 15 years	56,970		(41,850)		56,860		(38,990)
Technology and other, 17 - 30 years	43,300		(40,730)		43,300		(40,330)
Total technology and other	100,270		(82,580)		100,160		(79,320)
Indefinite-lived intangible assets:
Trademark/Trade names	61,860		—		60,340		—
Total other intangible assets	$	433,220	$	(252,200)	$	421,810	$	(233,700)

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):

	Year ended December 31,
	2023		2022		2021
Technology and other, included in cost of sales	$	3,210	$	3,300	$	3,820
Customer relationships, included in selling, general and administrative expenses	14,970		15,800		17,740
Total amortization expense	$	18,180	$	19,100	$	21,560

Schedule of Expected Amortization Expense [Table Text Block]

Estimated amortization expense for the next five fiscal years beginning after December 31, 2023 is as follows (dollars in thousands):

Year ended December 31,	Estimated Amortization Expense
2024		$	17,220
2025		16,870
2026		15,140
2027		15,080
2028		15,060