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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
Changes in the carrying amount of goodwill for the nine months ended September 30, 2025 are summarized as follows (dollars in thousands):
PackagingAerospaceSpecialty ProductsTotal
Balance, December 31, 2024$280,500 $69,300 $6,560 $356,360 
Goodwill from acquisitions— 15,490 — 15,490 
Foreign currency translation and other13,130 2,050 — 15,180 
Balance, September 30, 2025$293,630 $86,840 $6,560 $387,030 
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 September 30, 2025As of December 31, 2024
Intangible Category by Useful LifeGross Carrying AmountAccumulated AmortizationGross Carrying AmountAccumulated Amortization
Finite-lived intangible assets:
   Customer relationships, 5 – 12 years
$147,350 $(102,920)$138,840 $(95,360)
   Customer relationships, 15 – 25 years
129,460 (91,370)129,230 (86,690)
Total customer relationships276,810 (194,290)268,070 (182,050)
   Technology and other, 1 – 15 years
56,210 (45,000)56,790 (44,590)
   Technology and other, 17 – 30 years
43,300 (41,350)43,300 (41,080)
Total technology and other99,510 (86,350)100,090 (85,670)
Indefinite-lived intangible assets:
 Trademark/Trade names62,650 — 60,640 — 
Total other intangible assets$438,970 $(280,640)$428,800 $(267,720)
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 September 30, Nine months ended September 30,
2025202420252024
Technology and other, included in cost of sales$810 $810 $2,400 $2,470 
Customer relationships, included in selling, general and administrative expenses3,590 3,400 10,540 10,170 
Total amortization expense$4,400 $4,210 $12,940 $12,640