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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Schedule of Marketable Securities) (Details) $ in Thousands | Dec. 31, 2017 USD ($)
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Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Estimated fair value | $ 113,168
Gross unrealized gains | 40
Gross unrealized losses | (798)
Amortized cost | 113,926
Corporate Debentures [Member] |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Estimated fair value | 98,340
Gross unrealized gains | 25
Gross unrealized losses | (683)
Amortized cost | 98,998
Non- U.S government bonds [Member] |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Estimated fair value | 2,711
Gross unrealized gains |
Gross unrealized losses | (19)
Amortized cost | 2,730
Municipal bonds [Member] |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Estimated fair value | 11,869
Gross unrealized gains | 15
Gross unrealized losses | (96)
Amortized cost | 11,950
Certificate of deposits [Member] |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Estimated fair value | 248
Gross unrealized gains |
Gross unrealized losses |
Amortized cost | $ 248

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