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PURCHASED INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Purchased intangible assets |  |
Gross | $ 57,545 | $ 58,069
Accumulated Amortization | (50,170) | (49,480)
Net | 7,375 | 8,589
Core technology |  |
Purchased intangible assets |  |
Gross | 18,803 | 18,916
Accumulated Amortization | (11,428) | (10,866)
Net | 7,375 | 8,050
Customer relationships |  |
Purchased intangible assets |  |
Gross | 36,725 | 37,122
Accumulated Amortization | (36,725) | (36,583)
Net | 0 | 539
Trademarks / Trade names |  |
Purchased intangible assets |  |
Gross | 2,017 | 2,031
Accumulated Amortization | (2,017) | (2,031)
Net | $ 0 | $ 0

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