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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Changes in the carrying amount of goodwill for the years ended December 31, 2019 and 2018 are as follows (dollars in thousands):
|  |  |  |  | Specialty |  |
| Packaging |  | Aerospace |  | Products |  | Total
Balance, December 31, 2017 | $ | 166,400 |  |  | $ | 146,430 |  |  | $ | 6,560 |  |  | $ | 319,390 |
Foreign currency translation and other | (2,740 | ) |  | — |  |  | — |  |  | (2,740 | )
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 |
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, 2019 and 2018 are summarized below (dollars in thousands):
|  | As of December 31, 2019 |  | As of December 31, 2018
Intangible Category by Useful Life |  | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Finite-lived intangible assets: |  |  |  |  |  |  |  |
Customer relationships, 5 - 12 years |  | $ | 73,860 |  |  | $ | (49,910 | ) |  | $ | 66,370 |  |  | $ | (42,580 | )
Customer relationships, 15 - 25 years |  | 122,280 |  |  | (56,010 | ) |  | 122,280 |  |  | (49,560 | )
Total customer relationships |  | 196,140 |  |  | (105,920 | ) |  | 188,650 |  |  | (92,140 | )
Technology and other, 1 - 15 years |  | 52,430 |  |  | (29,790 | ) |  | 52,420 |  |  | (27,010 | )
Technology and other, 17 - 30 years |  | 43,300 |  |  | (37,620 | ) |  | 43,300 |  |  | (35,600 | )
Total technology and other |  | 95,730 |  |  | (67,410 | ) |  | 95,720 |  |  | (62,610 | )
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |
Trademark/Trade names |  | 42,850 |  |  | — |  |  | 38,270 |  |  | — |
Total other intangible assets |  | $ | 334,720 |  |  | $ | (173,330 | ) |  | $ | 322,640 |  |  | $ | (154,750 | )
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,
|  | 2019 |  | 2018 |  | 2017
Technology and other, included in cost of sales |  | $ | 4,780 |  |  | $ | 4,890 |  |  | $ | 5,140 |
Customer relationships, included in selling, general and administrative expenses |  | 13,850 |  |  | 13,370 |  |  | 13,400 |
Total amortization expense |  | $ | 18,630 |  |  | $ | 18,260 |  |  | $ | 18,540 |
Schedule of Expected Amortization Expense [Table Text Block] | Estimated amortization expense for the next five fiscal years beginning after December 31, 2019 is as follows (dollars in thousands):
Year ended December 31, | Estimated Amortization Expense
2020 |  | $ | 18,280 |
2021 |  | $ | 16,310 |
2022 |  | $ | 12,760 |
2023 |  | $ | 10,860 |
2024 |  | $ | 9,360 |

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