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SHORT-TERM AND LONG-TERM INVESTMENTS (Summary of Continuous Unrealized Losses and Fair Values) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Fair value, less than 12 months | $ 254,703 | $ 136,249
Fair value,12 months or greater | 120,661 | 55,913
Fair value, Total | 375,364 | 192,162
Unrealized losses, less than 12 months | (767) | (711)
Unrealized losses, 12 months or greater | (1,453) | (368)
Unrealized losses, Total | (2,220) | (1,079)
Corporate debentures [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fair value, less than 12 months | 231,845 | 135,252
Fair value,12 months or greater | 113,870 | 49,076
Fair value, Total | 345,715 | 184,328
Unrealized losses, less than 12 months | (754) | (711)
Unrealized losses, 12 months or greater | (1,239) | (198)
Unrealized losses, Total | (1,993) | (909)
U.S. treasuries [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fair value, less than 12 months | 14,926 |
Fair value,12 months or greater | 6,791 | 6,837
Fair value, Total | 21,717 | 6,837
Unrealized losses, less than 12 months | (12) |
Unrealized losses, 12 months or greater | (214) | (170)
Unrealized losses, Total | (226) | (170)
U.S. Government agencies [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fair value, less than 12 months | 7,932 | 997
Fair value,12 months or greater |  |
Fair value, Total | 7,932 | 997
Unrealized losses, less than 12 months | (1) |
Unrealized losses, 12 months or greater |  |
Unrealized losses, Total | $ (1) |

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