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PURCHASED INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Purchased intangible assets |  |
Gross | $ 53,680 | $ 58,069
Accumulated Amortization | (47,429) | (49,480)
Net | 6,251 | 8,589
Core technology |  |
Purchased intangible assets |  |
Gross | 17,999 | 18,916
Accumulated Amortization | (11,748) | (10,866)
Net | 6,251 | 8,050
Customer relationships |  |
Purchased intangible assets |  |
Gross | 33,751 | 37,122
Accumulated Amortization | (33,751) | (36,583)
Net | 0 | 539
Trademarks / Trade names |  |
Purchased intangible assets |  |
Gross | 1,930 | 2,031
Accumulated Amortization | (1,930) | (2,031)
Net | $ 0 | $ 0

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