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SHORT-TERM AND LONG-TERM INVESTMENTS (Summary of Continuous Unrealized Losses and Fair Values) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Fair value, less than 12 months | $ 81,707 | $ 254,703
Unrealized losses, less than 12 months | (137) | (767)
Fair value,12 months or greater | 53,663 | 120,661
Unrealized losses, 12 months or greater | (156) | (1,453)
Fair value, Total | 135,370 | 375,364
Unrealized losses, Total | (293) | (2,220)
Corporate debentures |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fair value, less than 12 months | 70,733 | 231,845
Unrealized losses, less than 12 months | (117) | (754)
Fair value,12 months or greater | 48,658 | 113,870
Unrealized losses, 12 months or greater | (154) | (1,239)
Fair value, Total | 119,391 | 345,715
Unrealized losses, Total | (271) | (1,993)
U.S. Treasuries |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fair value, less than 12 months | 0 | 14,926
Unrealized losses, less than 12 months | 0 | (12)
Fair value,12 months or greater | 5,005 | 6,791
Unrealized losses, 12 months or greater | (2) | (214)
Fair value, Total | 5,005 | 21,717
Unrealized losses, Total | (2) | (226)
U.S. Government Agencies |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fair value, less than 12 months | 10,974 | 7,932
Unrealized losses, less than 12 months | (20) | (1)
Fair value,12 months or greater | 0 | 0
Unrealized losses, 12 months or greater | 0 | 0
Fair value, Total | 10,974 | 7,932
Unrealized losses, Total | $ (20) | $ (1)

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