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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | The following table sets forth information with respect to goodwill and other intangible assets:
| December 31 |
In thousands |  | 2017 |  |  |  |  | 2016 |
Goodwill – Composite Fibers | $ | 82,744 |  |  |  | $ | 73,094 |
Specialty Papers |  |  |  |  |  |  |  |
Customer relationships | $ | 6,155 |  |  |  | $ | 6,155 |
Composite Fibers |  |  |  |  |  |  |  |
Tradename |  | 4,773 |  |  |  |  | 4,195 |
Technology and related |  | 40,686 |  |  |  |  | 35,874 |
Customer relationships and related |  | 36,705 |  |  |  |  | 32,310 |
Advanced Airlaid Materials |  |  |  |  |  |  |  |
Technology and related |  | 1,488 |  |  |  |  | 1,377 |
Customer relationships and related |  | 3,001 |  |  |  |  | 2,638 |
Total intangibles |  | 92,808 |  |  |  |  | 82,549 |
Accumulated amortization |  | (33,949 | ) |  |  |  | (26,290 | )
Net intangibles | $ | 58,859 |  |  |  | $ | 56,259 |
Summary of Amortization of Intangible Assets | amortized over periods ranging from 14 years to 20 years. The following table sets forth information pertaining to amortization of intangible assets:
In thousands |  |  | 2017 |  |  |  |  | 2016 |  |  |  |  | 2015 |
Aggregate amortization expense: |  | $ | 4,773 |  |  |  | $ | 4,852 |  |  |  | $ | 5,340 |
Estimated amortization expense: |  |  |  |  |  |  |  |  |  |  |  |  |  |
| 2018 |  |  | 4,773 |  |  |  |  |  |  |  |  |  |  |
| 2019 |  |  | 4,773 |  |  |  |  |  |  |  |  |  |  |
| 2020 |  |  | 4,639 |  |  |  |  |  |  |  |  |  |  |
| 2021 |  |  | 4,254 |  |  |  |  |  |  |  |  |  |  |
| 2022 |  |  | 4,139 |  |  |  |  |  |  |  |  |  |  |

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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