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SHORT-TERM AND LONG-TERM INVESTMENTS (Scheduled Maturities of Available-For-Sale Marketable Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Investments, Debt and Equity Securities [Abstract] |  |
Amortized cost, due within one year | $ 192,882 |
Amortized cost, due after one year through five years | 538,142 |
Amortized cost | 731,025 | $ 490,741
Estimated fair value, due within one year | 193,328 |
Estimated fair value, due after one year through five years | 542,389 |
Available-for-sale total | $ 735,717 | $ 488,727

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