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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Schedule of Marketable Securities) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
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

X

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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