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PURCHASED INTANGIBLE ASSETS | 9 Months Ended
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Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
PURCHASED INTANGIBLE ASSETS | PURCHASED INTANGIBLE ASSETS Our purchased intangible assets consisted of the following as of September 30, 2019:
| Gross |  | Accumulated Amortization |  | Net
Core technology | $ | 17,999 |  |  | $ | (11,748 | ) |  | $ | 6,251 |
Customer relationships | 33,751 |  |  | (33,751 | ) |  | — |
Trademarks / Trade names | 1,930 |  |  | (1,930 | ) |  | — |
Total intangible assets | $ | 53,680 |  |  | $ | (47,429 | ) |  | $ | 6,251 |
Our purchased intangible assets consisted of the following as of December 31, 2018:
| Gross |  | Accumulated Amortization |  | Net
Core technology | $ | 18,916 |  |  | $ | (10,866 | ) |  | $ | 8,050 |
Customer relationships | 37,122 |  |  | (36,583 | ) |  | 539 |
Trademarks / Trade names | 2,031 |  |  | (2,031 | ) |  | — |
Total intangible assets | $ | 58,069 |  |  | $ | (49,480 | ) |  | $ | 8,589 |
The change in the gross value of our purchased intangible assets from December 31, 2018 to September 30, 2019 was due to foreign currency translation and an adjustment due to the recognition of tax benefit of tax amortization previously applied to certain goodwill related to the NobelClad and DynaEnergetics reporting units. After the goodwill was written off at September 30, 2017 and December 31, 2015, respectively, the tax amortization reduces other noncurrent intangible assets related to the historical acquisition.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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