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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASURMENTS (Schedule of Investments with Continuous Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments with continuous unrealized losses for less than 12 months, Fair value | $ 22,914 | $ 100,681
Investments with continuous unrealized losses for less than 12 months, Unrealized losses | (153) | (798)
Investments with continuous unrealized losses losses for 12 months or greater, Fair value | 81,309 |
Investments with continuous unrealized losses losses for 12 months or greater, Unrealized losses | (1,930) |
Total Investments with continuous unrealized losses, Fair value | 104,223 | 100,681
Total Investments with continuous unrealized losses, Unrealized losses | (2,083) | (798)
Corporate Debentures [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments with continuous unrealized losses for less than 12 months, Fair value | 19,716 | 89,133
Investments with continuous unrealized losses for less than 12 months, Unrealized losses | (140) | (683)
Investments with continuous unrealized losses losses for 12 months or greater, Fair value | 79,609 |
Investments with continuous unrealized losses losses for 12 months or greater, Unrealized losses | (1,889) |
Total Investments with continuous unrealized losses, Fair value | 99,325 | 89,133
Total Investments with continuous unrealized losses, Unrealized losses | (2,029) | (683)
Non- U.S government bonds [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments with continuous unrealized losses for less than 12 months, Fair value | 963 | 2,711
Investments with continuous unrealized losses for less than 12 months, Unrealized losses |  | (19)
Investments with continuous unrealized losses losses for 12 months or greater, Fair value | 1,460 |
Investments with continuous unrealized losses losses for 12 months or greater, Unrealized losses | (33) |
Total Investments with continuous unrealized losses, Fair value | 2,423 | 2,711
Total Investments with continuous unrealized losses, Unrealized losses | (33) | (19)
Municipal bonds [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments with continuous unrealized losses for less than 12 months, Fair value | 2,235 | 8,837
Investments with continuous unrealized losses for less than 12 months, Unrealized losses | (13) | (96)
Investments with continuous unrealized losses losses for 12 months or greater, Fair value |  |
Investments with continuous unrealized losses losses for 12 months or greater, Unrealized losses |  |
Total Investments with continuous unrealized losses, Fair value | 2,235 | 8,837
Total Investments with continuous unrealized losses, Unrealized losses | (13) | $ (96)
Certificate of deposits [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments with continuous unrealized losses for less than 12 months, Fair value |  |
Investments with continuous unrealized losses for less than 12 months, Unrealized losses |  |
Investments with continuous unrealized losses losses for 12 months or greater, Fair value | 240 |
Investments with continuous unrealized losses losses for 12 months or greater, Unrealized losses | (8) |
Total Investments with continuous unrealized losses, Fair value | 240 |
Total Investments with continuous unrealized losses, Unrealized losses | $ (8) |

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