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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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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 |

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