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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASURMENTS (Schedule of Marketable Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Estimated fair value | $ 135,227 | $ 113,168
Gross unrealized gains | 50 | 40
Gross Unrealized losses | (2,083) | (798)
Amortized cost | 137,260 | 113,926
Corporate Debentures [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Estimated fair value | 109,639 | 98,340
Gross unrealized gains | 29 | 25
Gross Unrealized losses | (2,029) | (683)
Amortized cost | 111,639 | 98,998
U.S government bonds [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Estimated fair value | 5,465 |
Gross unrealized gains | 21 |
Gross Unrealized losses |  |
Amortized cost | 5,444 |
Non- U.S government bonds [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Estimated fair value | 2,423 | 2,711
Gross unrealized gains |  |
Gross Unrealized losses | (33) | (19)
Amortized cost | 2,456 | 2,730
Municipal bonds [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Estimated fair value | 2,235 | 11,869
Gross unrealized gains |  | 15
Gross Unrealized losses | (13) | (96)
Amortized cost | 2,248 | 11,950
Money market fund [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Estimated fair value | 15,225 |
Gross unrealized gains |  |
Gross Unrealized losses |  |
Amortized cost | 15,225 |
Certificate of deposits [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Estimated fair value | 240 | 248
Gross unrealized gains |  |
Gross Unrealized losses | (8) |
Amortized cost | $ 248 | $ 248

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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