MARKETABLE SECURITIES (Schedule of Marketable Securities Calssified as Available-for-sale Securities) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Amortized cost	$ 70,532	$ 33,021
Gross unrealized gains	2
Gross unrealized losses	(317)	(291)
Fair value	22,992	32,730
Certificates of Deposit [Member]
Amortized cost	2,967	11,075
Gross unrealized gains	2
Gross unrealized losses		(62)
Fair value	2,969	11,013
Corporate Bonds [Member]
Amortized cost	67,565	21,946
Gross unrealized gains
Gross unrealized losses	(317)	(229)
Fair value	67,248	21,717
Corporate Bonds Maturing Within One Year [Member]
Amortized cost	20,061	2,113
Gross unrealized gains
Gross unrealized losses	(38)	(10)
Fair value	20,023	2,103
Corporate Bonds Maturing Within Between One To Five Years [Member]
Amortized cost	47,504	19,833
Gross unrealized gains
Gross unrealized losses	(279)	(219)
Fair value	$ 47,225	$ 19,614

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

No definition available.

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- Definition

Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

+ 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)
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Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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Amount of investment in marketable security, classified as current.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
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