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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Changes in the carrying amount of goodwill for the years ended December 31, 2020 and 2019 are as follows (dollars in thousands):
|  |  |  |  | Specialty |  |  |  |
| Packaging |  | Aerospace |  | Products |  |  |  | Total
Balance, December 31, 2018 | $ | 163,660 |  |  | $ | 146,430 |  |  | $ | 6,560 |  |  |  |  | $ | 316,650 |
Goodwill from acquisitions | 18,400 |  |  | — |  |  | — |  |  |  |  | 18,400 |
Goodwill reassigned in segment realignment | — |  |  | (12,740) |  |  | 12,740 |  |  |  |  | — |
Foreign currency translation and other | (410) |  |  | — |  |  | — |  |  |  |  | (410) |
Balance, December 31, 2019 | $ | 181,650 |  |  | $ | 133,690 |  |  | $ | 19,300 |  |  |  |  | $ | 334,640 |
Goodwill from acquisitions | 49,130 |  |  | 43,260 |  |  | — |  |  |  |  | 92,390 |
Impairment charge | — |  |  | (126,840) |  |  | — |  |  |  |  | (126,840) |
Goodwill reassigned in segment realignment | — |  |  | 12,740 |  |  | (12,740) |  |  |  |  | — |
Foreign currency translation and other | 3,780 |  |  | — |  |  | — |  |  |  |  | 3,780 |
Balance, December 31, 2020 | $ | 234,560 |  |  | $ | 62,850 |  |  | $ | 6,560 |  |  |  |  | $ | 303,970 |
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, 2020 and 2019 are summarized below (dollars in thousands):
|  | As of December 31, 2020 |  | As of December 31, 2019
Intangible Category by Useful Life |  | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Finite-lived intangible assets: |  |  |  |  |  |  |  |
Customer relationships, 5 - 12 years |  | $ | 122,970 |  |  | $ | (59,470) |  |  | $ | 73,860 |  |  | $ | (49,910) |
Customer relationships, 15 - 25 years |  | 122,280 |  |  | (62,450) |  |  | 122,280 |  |  | (56,010) |
Total customer relationships |  | 245,250 |  |  | (121,920) |  |  | 196,140 |  |  | (105,920) |
Technology and other, 1 - 15 years |  | 57,180 |  |  | (32,800) |  |  | 52,430 |  |  | (29,790) |
Technology and other, 17 - 30 years |  | 43,300 |  |  | (39,450) |  |  | 43,300 |  |  | (37,620) |
Total technology and other |  | 100,480 |  |  | (72,250) |  |  | 95,730 |  |  | (67,410) |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |
Trademark/Trade names |  | 54,640 |  |  | — |  |  | 42,850 |  |  | — |
Total other intangible assets |  | $ | 400,370 |  |  | $ | (194,170) |  |  | $ | 334,720 |  |  | $ | (173,330) |
Schedule of Finite-Lived Intangible Assets, Amortization Expense | Amortization expense related to intangible assets as included in the accompanying consolidated statement of operations is summarized as follows (dollars in thousands):
|  | Year ended December 31,
|  | 2020 |  | 2019 |  | 2018
Technology and other, included in cost of sales |  | $ | 4,930 |  |  | $ | 4,780 |  |  | $ | 4,890 |
Customer relationships, included in selling, general and administrative expenses |  | 15,820 |  |  | 13,850 |  |  | 13,370 |
Total amortization expense |  | $ | 20,750 |  |  | $ | 18,630 |  |  | $ | 18,260 |
Schedule of Expected Amortization Expense [Table Text Block] | Estimated amortization expense for the next five fiscal years beginning after December 31, 2020 is as follows (dollars in thousands):
Year ended December 31, | Estimated Amortization Expense
2021 |  | $ | 21,790 |
2022 |  | $ | 18,230 |
2023 |  | $ | 16,330 |
2024 |  | $ | 14,830 |
2025 |  | $ | 14,480 |

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