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Goodwill And Other Intangible Assets | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill And Other Intangible Assets | Goodwill and Other Intangible Assets We are required to review goodwill and indefinite-lived intangible assets annually for impairment. Goodwill impairment is tested at the reporting unit level on an annual basis and between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying value. For the years ended December 31, 2018 and 2017 an assessment for potential impairment was performed and an impairment adjustment was not required. The following table represents the changes in the carrying value of goodwill and intangibles from December 31, 2016 through December 31, 2018:
| Total
| (Dollars in Thousands)
Balance as of December 31, 2016 | $ | 171,117 |
Adjustments | — |
Balance as of December 31, 2017 | 171,117 |
Adjustments | — |
Balance as of December 31, 2018 | $ | 171,117 |
The following table summarizes acquired intangible assets with determinable useful lives by major category which are included in "Other Assets" on our consolidated balance sheets:
| As of December 31, 2018 |  | As of December 31, 2017
Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
(Dollars in Thousands)
Trade name | $ | 22,500 |  |  | $ | (7,721 | ) |  | $ | 14,779 |  |  | $ | 22,500 |  |  | $ | (5,512 | ) |  | $ | 16,988 |
Technology and know-how | 55,300 |  |  | (23,503 | ) |  | 31,797 |  |  | 55,300 |  |  | (17,265 | ) |  | 38,035 |
Customer related intangible | 64,500 |  |  | (15,070 | ) |  | 49,430 |  |  | 64,500 |  |  | (10,637 | ) |  | 53,863 |
Total finite-lived intangible assets | $ | 142,300 |  |  | $ | (46,294 | ) |  | $ | 96,006 |  |  | $ | 142,300 |  |  | $ | (33,414 | ) |  | $ | 108,886 |
Amortization expense of intangible assets was $12.9 million, $13.6 million, $14.3 million in 2018, 2017 and 2016, respectively. Estimated annual amortization expense for the next five years will approximate $12.2 million in 2019, $11.4 million in 2020, $10.7 million in 2021, $10.1 million in 2022 and $9.2 million in 2023.

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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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