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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Changes in the carrying amount of goodwill for the years ended December 31, 2018 and 2017 are as follows (dollars in thousands):
|  |  |  |  | Specialty |  |
| Packaging |  | Aerospace |  | Products |  | Total
Balance, December 31, 2016 | $ | 162,090 |  |  | $ | 146,430 |  |  | $ | 6,560 |  |  | $ | 315,080 |
Foreign currency translation and other | 4,310 |  |  | — |  |  | — |  |  | 4,310 |
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 |
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 as of December 31, 2018 and 2017 are summarized below (dollars in thousands):
|  | As of December 31, 2018 |  | As of December 31, 2017
Intangible Category by Useful Life |  | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Finite-lived intangible assets: |  |  |  |  |  |  |  |
Customer relationships, 5 - 12 years |  | $ | 73,450 |  |  | $ | (48,410 | ) |  | $ | 73,910 |  |  | $ | (41,000 | )
Customer relationships, 15 - 25 years |  | 132,230 |  |  | (58,790 | ) |  | 132,230 |  |  | (51,880 | )
Total customer relationships |  | 205,680 |  |  | (107,200 | ) |  | 206,140 |  |  | (92,880 | )
Technology and other, 1 - 15 years |  | 57,020 |  |  | (31,600 | ) |  | 57,340 |  |  | (29,120 | )
Technology and other, 17 - 30 years |  | 43,300 |  |  | (35,600 | ) |  | 43,300 |  |  | (33,490 | )
Total technology and other |  | 100,320 |  |  | (67,200 | ) |  | 100,640 |  |  | (62,610 | )
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |
Trademark/Trade names |  | 42,930 |  |  | — |  |  | 42,930 |  |  | — |
Total other intangible assets |  | $ | 348,930 |  |  | $ | (174,400 | ) |  | $ | 349,710 |  |  | $ | (155,490 | )
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,
|  | 2018 |  | 2017 |  | 2016
Technology and other, included in cost of sales |  | $ | 4,900 |  |  | $ | 5,340 |  |  | $ | 5,680 |
Customer relationships, included in selling, general and administrative expenses |  | 14,540 |  |  | 14,580 |  |  | 14,790 |
Total amortization expense |  | $ | 19,440 |  |  | $ | 19,920 |  |  | $ | 20,470 |
Schedule of Expected Amortization Expense [Table Text Block] | Estimated amortization expense for the next five fiscal years beginning after December 31, 2018 is as follows (dollars in thousands):
Year ended December 31, | Estimated Amortization Expense
2019 |  | $ | 19,080 |
2020 |  | $ | 18,140 |
2021 |  | $ | 15,360 |
2022 |  | $ | 11,810 |
2023 |  | $ | 9,910 |

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- Definition Tabular disclosure of intangibles assets, in total and by major class, including the gross carrying amount and accumulated amortization. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References No definition available. + Details
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