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GOODWILL AND INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2018
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Intangible Assets | INTANGIBLE ASSETS The components of intangible assets for each of the years ended December 31, 2018 and 2017, were as follows (amounts in thousands):
| Weighted- Average Useful Lives (in Years) |  | 2018 |  | 2017
Amortizable intangible assets: |  |  |  |  |
Customer relationships | 8.7 |  | $ | 12,967 |  |  | $ | 13,922 |
Patents, trademarks, and other | 7.7 |  | 11,356 |  |  | 15,208 |
Total at cost |  |  | 24,323 |  |  | 29,130 |
Less accumulated amortization |  |  | (12,676 | ) |  | (13,855 | )
|  |  | $ | 11,647 |  |  | $ | 15,275 |
Amortization related to intangible assets for the years 2018, 2017, and 2016 totaled $2.3 million, $3.0 million, and $2.2 million, respectively. The estimated aggregate amortization expense at December 31, 2018, for each of the years (or other periods) set forth below was as follows (amounts in thousands):
2019 | $ | 2,123 |
2020 | 2,049 |
2021 | 1,393 |
2022 | 1,042 |
2023 | 1,042 |
Thereafter | 3,998 |
| $ | 11,647 |

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- Definition The entire disclosure for goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2144439 + Details
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