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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | Goodwill and Other Intangible Assets Goodwill The changes in the carrying amount of goodwill for the period ending December 31, 2020, by operating segment, were as follows:
(Dollars in thousands) | Advanced Connectivity Solutions |  | Elastomeric Material Solutions |  | Power Electronics Solutions |  | Other |  | Total
December 31, 2019 | $ | 51,694 |  |  | $ | 142,030 |  |  | $ | 66,982 |  |  | $ | 2,224 |  |  | $ | 262,930 |
Foreign currency translation adjustment | — |  |  | 991 |  |  | 6,251 |  |  | — |  |  | 7,242 |
December 31, 2020 | $ | 51,694 |  |  | $ | 143,021 |  |  | $ | 73,233 |  |  | $ | 2,224 |  |  | $ | 270,172 |
Other Intangible Assets The changes in the carrying amount of other intangible assets for the two-year period ending December 31, 2020, were as follows:
| December 31, 2020 |  | December 31, 2019
(Dollars in thousands) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships | $ | 150,863 |  |  | $ | 72,014 |  |  | $ | 78,849 |  |  | $ | 149,317 |  |  | $ | 39,018 |  |  | $ | 110,299 |
Technology | 83,469 |  |  | 53,540 |  |  | 29,929 |  |  | 80,938 |  |  | 45,190 |  |  | 35,748 |
Trademarks and trade names | 12,039 |  |  | 8,149 |  |  | 3,890 |  |  | 11,994 |  |  | 4,361 |  |  | 7,633 |
Covenants not to compete | 1,340 |  |  | 827 |  |  | 513 |  |  | 1,340 |  |  | 505 |  |  | 835 |
Total definite-lived other intangible assets | 247,711 |  |  | 134,530 |  |  | 113,181 |  |  | 243,589 |  |  | 89,074 |  |  | 154,515 |
Indefinite-lived other intangible asset | 4,845 |  |  | — |  |  | 4,845 |  |  | 4,432 |  |  | — |  |  | 4,432 |
Total other intangible assets | $ | 252,556 |  |  | $ | 134,530 |  |  | $ | 118,026 |  |  | $ | 248,021 |  |  | $ | 89,074 |  |  | $ | 158,947 |
In the table above, gross carrying amounts and accumulated amortization may differ from prior periods due to foreign exchange rate fluctuations. Amortization expense was $42.1 million, $17.8 million and $16.5 million in 2020, 2019 and 2018, respectively. The estimated annual future amortization expense is $12.4 million, $11.9 million, $11.3 million, $10.0 million and $8.5 million in 2021, 2022, 2023, 2024 and 2025, respectively. These amounts could vary based on changes in foreign currency exchange rates. The increase in amortization expense in 2020, and decrease in forecasted amortization expense in future years, were due to the acceleration of amortization expense related to our Diversified Silicone Products, Inc. (DSP) customer relationships and trademarks and trade names definite-lived other intangible assets, which were both accelerated to be fully amortized by December 31, 2020. As part of our ongoing assessment of the useful lives of our definite-lived other intangible assets, we reviewed the deterioration of our DSP business and identified significant customer attrition, a sustained substantial decrease in net sales, as well as the planned phase-out of the DSP trademark and trade name by December 2020. Based on these events and circumstances, we concluded an adjustment to the remaining useful lives of our DSP customer relationships and trademarks and trade names definite-lived other intangible assets was warranted. The weighted average amortization period as of December 31, 2020, by definite-lived other intangible asset class, is presented in the table below:
Definite-Lived Other Intangible Asset Class | Weighted Average Remaining Amortization Period
Customer relationships | 6.10
Technology | 3.90
Trademarks and trade names | 4.85
Covenants not to compete | 1.27
Total definite-lived other intangible assets | 5.45

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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