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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
NET REVENUES | $ 108,249 | $ 111,255 | $ 107,563 | $ 104,688 | $ 102,436 | $ 101,625 | $ 97,571 | $ 88,036 | $ 431,755 | $ 389,668 | $ 344,609
United States of America |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
NET REVENUES |  |  |  |  |  |  |  |  | 16,647 | 14,948 | 14,759
Hong Kong/China |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
NET REVENUES |  |  |  |  |  |  |  |  | 227,335 | 198,858 | 173,202
Taiwan |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
NET REVENUES |  |  |  |  |  |  |  |  | 50,307 | 50,324 | 47,279
Korea |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
NET REVENUES |  |  |  |  |  |  |  |  | 38,012 | 41,996 | 34,264
Western Europe (excluding Germany) |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
NET REVENUES |  |  |  |  |  |  |  |  | 48,230 | 41,214 | 38,028
Japan |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
NET REVENUES |  |  |  |  |  |  |  |  | 20,769 | 19,767 | 16,994
Germany |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
NET REVENUES |  |  |  |  |  |  |  |  | 11,558 | 7,563 | 7,802
Other |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
NET REVENUES |  |  |  |  |  |  |  |  | $ 18,897 | $ 14,998 | $ 12,281

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