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INTANGIBLE ASSETS (Tables) | 3 Months Ended
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Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Goodwill [Table Text Block] | The components of intangible assets consisted of the following as of the dates set forth below (amounts in thousands):
| Weighted Average Useful Lives (in years) March 31, 2019 |  | March 31, 2019 |  | December 31, 2018
Amortizable intangible assets: |  |  |  |  |
Customer relationships | 8.4 |  | $ | 12,801 |  |  | $ | 12,967 |
Patents, trademarks and other | 7.6 |  | 11,149 |  |  | 11,356 |
Total at cost |  |  | 23,950 |  |  | 24,323 |
Less accumulated amortization |  |  | (12,621 | ) |  | (12,676 | )
|  |  | $ | 11,329 |  |  | $ | 11,647 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | The estimated aggregate amortization expense at March 31, 2019, for each of the years (or other periods) set forth below was as follows (amounts in thousands):
April 1 - December 31, 2019 | $ | 2,139 |
2020 | 2,060 |
2021 | 1,104 |
2022 | 998 |
2023 | 998 |
Thereafter | 4,030 |
| $ | 11,329 |

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