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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in the carrying amount of goodwill, by segment | The changes in the carrying amount of goodwill for the period ending December 31, 2017, by operating segment, were as follows:
(Dollars in thousands) | Advanced Connectivity Solutions |  | Elastomeric Material Solutions |  | Power Electronics Solutions |  | Other |  | Total
December 31, 2016 | $ | 51,693 |  |  | $ | 91,531 |  |  | $ | 62,983 |  |  | $ | 2,224 |  |  | $ | 208,431 |
Purchase accounting adjustment | — |  |  | 346 |  |  | — |  |  | — |  |  | 346 |
DSP acquisition | — |  |  | 17,793 |  |  | — |  |  | — |  |  | 17,793 |
Foreign currency translation adjustment | — |  |  | 1,905 |  |  | 8,632 |  |  | — |  |  | 10,537 |
December 31, 2017 | $ | 51,693 |  |  | $ | 111,575 |  |  | $ | 71,615 |  |  | $ | 2,224 |  |  | $ | 237,107 |
Intangible assets | The changes in the carrying amount of other intangible assets for the two-year period ending December 31, 2017, were as follows:
| December 31, 2017 |  | December 31, 2016
(Dollars in thousands) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships | $ | 128,907 |  |  | $ | 22,514 |  |  | $ | 106,393 |  |  | $ | 96,148 |  |  | $ | 14,311 |  |  | $ | 81,837 |
Technology | 73,891 |  |  | 33,491 |  |  | 40,400 |  |  | 68,880 |  |  | 24,365 |  |  | 44,515 |
Trademarks and patents | 10,213 |  |  | 2,157 |  |  | 8,056 |  |  | 6,825 |  |  | 1,156 |  |  | 5,669 |
Covenant not to compete | 1,799 |  |  | 1,108 |  |  | 691 |  |  | 1,419 |  |  | 932 |  |  | 487 |
Total definite-lived other intangible assets | 214,810 |  |  | 59,270 |  |  | 155,540 |  |  | 173,272 |  |  | 40,764 |  |  | 132,508 |
Indefinite-lived other intangible asset | 4,738 |  |  | — |  |  | 4,738 |  |  | 4,168 |  |  | — |  |  | 4,168 |
Total other intangible assets | $ | 219,548 |  |  | $ | 59,270 |  |  | $ | 160,278 |  |  | $ | 177,440 |  |  | $ | 40,764 |  |  | $ | 136,676 |
Weighted average amortization period, by intangible asset class | The weighted average amortization period as of December 31, 2017, by definite-lived other intangible asset class, is presented in the table below:
Definite-Lived Other Intangible Asset Class | Weighted Average Amortization Period
Customer relationships | 9.6
Technology | 5.4
Trademarks and patents | 6.5
Covenant not to compete | 2.5
Total definite-lived other intangible assets | 8.3

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