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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Schedule of Investments with Continuous Unrealized Losses) (Details) $ in Thousands | Dec. 31, 2017 USD ($)
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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 | $ 100,681
Investments with continuous unrealized losses for less than 12 months, Unrealized losses | (798)
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 | 100,681
Total Investments with continuous unrealized losses, Unrealized losses | (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 | 89,133
Investments with continuous unrealized losses for less than 12 months, Unrealized losses | (683)
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 | 89,133
Total Investments with continuous unrealized losses, Unrealized losses | (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 | 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 |
Investments with continuous unrealized losses losses for 12 months or greater, Unrealized losses |
Total Investments with continuous unrealized losses, Fair value | 2,711
Total Investments with continuous unrealized losses, Unrealized losses | (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 | 8,837
Investments with continuous unrealized losses for less than 12 months, Unrealized losses | (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 | 8,837
Total Investments with continuous unrealized losses, Unrealized losses | $ (96)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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