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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, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 197,841 | $ 129,343
Gross unrealized gains | 9 | 91
Gross unrealized losses | 1,079 | 421
Estimated fair value, total | 196,771 | 129,013
Fair Value Inputs Level 2 [Member] | Corporate debentures [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 189,836 | 122,335
Gross unrealized gains | 9 | 91
Gross unrealized losses | 908 | 225
Estimated fair value, total | 188,937 | 122,201
Fair Value Inputs Level 2 [Member] | U.S. treasuries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 7,007 | 7,008
Gross unrealized gains |  |
Gross unrealized losses | 170 | 196
Estimated fair value, total | 6,837 | 6,812
Fair Value Inputs Level 2 [Member] | U.S. Government agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 998 |
Gross unrealized gains |  |
Gross unrealized losses | 1 |
Estimated fair value, total | $ 997 |

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