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GOODWILL AND INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2017
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Intangible Assets | INTANGIBLE ASSETS The components of intangible assets for each of the years ended December 31, 2017 and 2016, were as follows (amounts in thousands):
| Weighted- Average Useful Lives (in Years) |  | 2017 |  | 2016
Amortizable intangible assets: |  |  |  |  |
Customer relationships | 9.7 |  | $ | 13,922 |  |  | $ | 13,171 |
Patents, trademarks, and other | 7.4 |  | 15,208 |  |  | 14,629 |
Total at cost |  |  | 29,130 |  |  | 27,800 |
Less accumulated amortization |  |  | (13,855 | ) |  | (11,399 | )
|  |  | $ | 15,275 |  |  | $ | 16,401 |
Amortization related to intangible assets for the years 2017, 2016, and 2015 totaled $3.0 million, $2.2 million, and $3.0 million, respectively. The estimated aggregate amortization expense at December 31, 2017, for each of the years (or other periods) set forth below was as follows (amounts in thousands):
2018 | $ | 2,397 |
2019 | 2,237 |
2020 | 2,237 |
2021 | 1,543 |
2022 | 1,053 |
Thereafter | 5,808 |
| $ | 15,275 |

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- Definition The entire disclosure for goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2144439 + Details
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- References No definition available. + Details
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