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SHORT-TERM AND LONG-TERM INVESTMENTS (Summary of Amortized Costs, Gross Unrealized Gains and Losses and Estimated Fair Values of Available-For-Sale Marketable Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | $ 490,741 | $ 197,841
Gross unrealized gains | 206 | 9
Gross unrealized losses | 2,220 | 1,079
Estimated fair value, total | 488,727 | 196,771
Fair Value Inputs Level 2 [Member] | Corporate debentures [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 457,943 | 189,836
Gross unrealized gains | 190 | 9
Gross unrealized losses | 1,993 | 908
Estimated fair value, total | 456,141 | 188,937
Fair Value Inputs Level 2 [Member] | U.S. treasuries [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 21,944 | 7,007
Gross unrealized gains |  |
Gross unrealized losses | 226 | 170
Estimated fair value, total | 21,717 | 6,837
Fair Value Inputs Level 2 [Member] | U.S. Government agencies [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 10,854 | 998
Gross unrealized gains | 16 |
Gross unrealized losses | 1 | 1
Estimated fair value, total | $ 10,869 | $ 997

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