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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets |
14. | GOODWILL AND INTANGIBLE ASSETS
The following table sets forth information with respect to goodwill and other intangible assets:
| December 31 |
In thousands |  | 2018 |  |  |  |  | 2017 |
Goodwill |  |  |  |  |  |  |  |
Composite Fibers | $ | 79,024 |  |  |  | $ | 82,744 |
Advanced Airlaid Materials |  | 74,439 |  |  |  |  | — |
Total Goodwill |  | 153,463 |  |  |  |  | 82,744 |
Other Intangible Assets |  |  |  |  |  |  |  |
Composite Fibers |  |  |  |  |  |  |  |
Tradename - nonamortizing |  | 4,556 |  |  |  |  | 4,773 |
Technology and related |  | 38,813 |  |  |  |  | 40,686 |
Customer relationships and related |  | 35,029 |  |  |  |  | 36,705 |
Advanced Airlaid Materials |  |  |  |  |  |  |  |
Tradename |  | 4,534 |  |  |  |  | — |
Technology and related |  | 18,014 |  |  |  |  | 1,488 |
Customer relationships and related |  | 24,853 |  |  |  |  | 3,001 |
Total intangibles |  | 125,799 |  |  |  |  | 86,653 |
Accumulated amortization |  | (32,185 | ) |  |  |  | (27,794 | )
Net intangibles | $ | 93,614 |  |  |  | $ | 58,859 |
The change in the gross value of goodwill and intangible assets was primarily due to additional amounts recorded in connection with the Steinfurt acquisition and due to currency translation adjustments. Other than goodwill and an indefinite-lived tradename, intangible assets are amortized on a straight-line basis. Customer relationships are amortized over periods ranging from 10 years to 14 years and technology and related intangible assets are amortized over periods ranging from 14 years to 20 years. The following table sets forth information pertaining to amortization of intangible assets:
In thousands |  |  | 2018 |  |  |  |  | 2017 |  |  |  |  | 2016 |
Aggregate amortization expense: |  | $ | 5,860 |  |  |  | $ | 4,773 |  |  |  | $ | 4,852 |
Estimated amortization expense: |  |  |  |  |  |  |  |  |  |  |  |  |  |
| 2019 |  |  | 8,416 |  |  |  |  |  |  |  |  |  |  |
| 2020 |  |  | 8,289 |  |  |  |  |  |  |  |  |  |  |
| 2021 |  |  | 7,887 |  |  |  |  |  |  |  |  |  |  |
| 2022 |  |  | 7,767 |  |  |  |  |  |  |  |  |  |  |
| 2023 |  |  | 7,767 |  |  |  |  |  |  |  |  |  |  |
The remaining weighted average useful life of intangible assets was 11.4 years at December 31, 2018.

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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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