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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 | 4. Goodwill and Other Intangible Assets The changes in the carrying value of goodwill for the years ended December 31, 2018 and 2017, were as follows:
(In thousands) |  | Surfactants Segment |  |  | Polymer Segment |  |  | Specialty Products Segment |  |  | Total |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Balance as of January 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ | 22,627 |  |  | $ | 22,958 |  |  | $ | 5,475 |  |  | $ | 5,334 |  |  | $ | 483 |  |  | $ | 483 |  |  | $ | 28,585 |  |  | $ | 28,775 |
Accumulated impairment loss |  |  | (3,467 | ) |  |  | (3,467 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,467 | ) |  |  | (3,467 | )
Goodwill, net |  |  | 19,160 |  |  |  | 19,491 |  |  |  | 5,475 |  |  |  | 5,334 |  |  |  | 483 |  |  |  | 483 |  |  |  | 25,118 |  |  |  | 25,308 |
Goodwill acquired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Goodwill measurement period adjustment (a) |  |  | — |  |  |  | (120 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (120 | )
Foreign currency translation |  |  | (2,106 | ) |  |  | (211 | ) |  |  | (58 | ) |  |  | 141 |  |  |  | — |  |  |  | — |  |  |  | (2,164 | ) |  |  | (70 | )
Balance as of December 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 20,521 |  |  |  | 22,627 |  |  |  | 5,417 |  |  |  | 5,475 |  |  |  | 483 |  |  |  | 483 |  |  |  | 26,421 |  |  |  | 28,585 |
Accumulated impairment loss |  |  | (3,467 | ) |  |  | (3,467 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,467 | ) |  |  | (3,467 | )
Goodwill, net |  | $ | 17,054 |  |  | $ | 19,160 |  |  | $ | 5,417 |  |  | $ | 5,475 |  |  | $ | 483 |  |  | $ | 483 |  |  | $ | 22,954 |  |  | $ | 25,118 |
(a) | See Note 20 for information regarding the goodwill acquired in a business combination.
The Company tests its goodwill balances for impairment in the second quarter of each calendar year. The 2018 and 2017 tests indicated no impairment. The following table presents the components of other intangible assets, all of which have finite lives, as of December 31, 2018 and 2017. The year-over-year changes in gross carrying values mainly resulted from the effects of foreign currency translation.
(In thousands) |  | Gross Carrying Value |  |  | Accumulated Amortization |
|  | December 31 |  |  | December 31 |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Other Intangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Patents |  | $ | 6,947 |  |  | $ | 6,947 |  |  | $ | 4,492 |  |  | $ | 3,893 |
Non-compete agreements |  |  | 387 |  |  | $ | 453 |  |  |  | 173 |  |  | $ | 113 |
Trademarks |  |  | 3,800 |  |  |  | 4,087 |  |  |  | 1,929 |  |  |  | 1,870 |
Customer lists |  |  | 10,750 |  |  |  | 12,150 |  |  |  | 4,356 |  |  |  | 4,299 |
Supply contract |  |  | 2,113 |  |  |  | 2,476 |  |  |  | 1,189 |  |  |  | 774 |
Know-how (a) |  |  | 7,900 |  |  |  | 8,043 |  |  |  | 5,514 |  |  |  | 4,669 |
Total |  | $ | 31,897 |  |  | $ | 34,156 |  |  | $ | 17,653 |  |  | $ | 15,618 |
(a) | Know-how includes intellectual property rights covering proprietary information, written formulae, trade secrets or secret processes, inventions and developmental products (whether patentable or not), discoveries, improvements, compositions, manufacturing processes, manuals, specifications and technical data
Aggregate amortization expense for the years ended December 31, 2018, 2017 and 2016, was $3,470,000, $3,711,000, and $2,845,000, respectively. Estimated amortization expense for identifiable intangibles assets for each of the five succeeding fiscal years is as follows:
(In thousands) |  |  |  |
For year ended 12/31/19 |  | $ | 3,428 |
For year ended 12/31/20 |  |  | 3,296 |
For year ended 12/31/21 |  |  | 1,967 |
For year ended 12/31/22 |  |  | 1,321 |
For year ended 12/31/23 |  |  | 1,321 |

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