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SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES (Geographic Net Revenues) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 150,693 | $ 121,129 | $ 106,832 | $ 109,664 | $ 114,457 | $ 114,159 | $ 102,865 | $ 89,188 | $ 488,318 | $ 420,669 | $ 415,955
United States of America |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 11,065 | 10,662 | 15,315
Hong Kong/China |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 306,938 | 237,341 | 218,752
Taiwan |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 21,650 | 36,297 | 43,081
Korea |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 40,059 | 30,395 | 33,877
Western Europe (excluding Germany) |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 33,564 | 36,025 | 49,834
Japan |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 17,453 | 15,496 | 19,897
Germany |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 23,242 | 20,197 | 14,403
Other |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 34,347 | $ 34,256 | $ 20,796

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