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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
Changes in the carrying amount of goodwill for the years ended December 31, 2024 and 2023 are as follows (dollars in thousands):
Specialty
PackagingAerospaceProductsTotal
Balance, December 31, 2022$263,550 $69,700 $6,560 $339,810 
Goodwill from acquisitions20,420 — — 20,420 
Foreign currency translation and other3,380 160 — 3,540 
Balance, December 31, 2023$287,350 $69,860 $6,560 $363,770 
Foreign currency translation and other(6,850)(560)— (7,410)
Balance, December 31, 2024$280,500 $69,300 $6,560 $356,360 
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, 2024 and 2023 are summarized below (dollars in thousands):
 As of December 31, 2024As of December 31, 2023
Intangible Category by Useful LifeGross Carrying
Amount		Accumulated
Amortization		Gross Carrying
Amount		Accumulated
Amortization
Finite-lived intangible assets:    
Customer relationships, 5 - 12 years$138,840 $(95,360)$141,260 $(89,020)
Customer relationships, 15 - 25 years129,230 (86,690)129,830 (80,600)
Total customer relationships268,070 (182,050)271,090 (169,620)
Technology and other, 1 - 15 years56,790 (44,590)56,970 (41,850)
Technology and other, 17 - 30 years43,300 (41,080)43,300 (40,730)
Total technology and other100,090 (85,670)100,270 (82,580)
Indefinite-lived intangible assets:
Trademark/Trade names60,640 — 61,860 — 
Total other intangible assets$428,800 $(267,720)$433,220 $(252,200)
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,
202420232022
Technology and other, included in cost of sales$3,250 $3,210 $3,300 
Customer relationships, included in selling, general and administrative expenses13,550 14,970 15,800 
Total amortization expense$16,800 $18,180 $19,100 
Schedule of Expected Amortization Expense [Table Text Block]
Estimated amortization expense for the next five fiscal years beginning after December 31, 2024 is as follows (dollars in thousands):
Year ended December 31,Estimated Amortization Expense
2025$16,290 
202614,670 
202714,610 
202814,580 
202913,890