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SHAREHOLDERS' EQUITY (Schedule of Stock-Based Compensation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock-based compensation related to options and shares issued to employees and others | $ 109,337 | $ 72,330 | $ 47,700
Cost of Revenues [Member] |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock-based compensation related to options and shares issued to employees and others | 5,854 | 4,418 | 2,930
Research and Development Expense [Member] |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock-based compensation related to options and shares issued to employees and others | 56,161 | 39,417 | 26,227
Sales and Marketing Expense [Member] |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock-based compensation related to options and shares issued to employees and others | 18,458 | 9,770 | 6,585
General and Administrative Expense [Member] |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock-based compensation related to options and shares issued to employees and others | $ 28,864 | $ 18,725 | $ 11,958

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