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SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES Geographic Net Revevnues (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 93,307 | $ 110,085 | $ 109,482 | $ 103,081 | $ 108,249 | $ 111,255 | $ 107,563 | $ 104,688 | $ 415,955 | $ 431,755 | $ 389,668
United States of America |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 15,315 | 16,647 | 14,948
Hong Kong/China |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 218,752 | 227,335 | 198,858
Taiwan |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 43,081 | 50,307 | 50,324
Korea |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 33,877 | 38,012 | 41,996
Western Europe (excluding Germany) |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 49,834 | 48,230 | 41,214
Japan |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 19,897 | 20,769 | 19,767
Germany |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 14,403 | 11,558 | 7,563
Other |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 20,796 | $ 18,897 | $ 14,998

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