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DERIVATIVE INSTRUMENTS (Schedule of Net Income (Loss) Related to Effective Portion of Hedging Instruments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in income related to the effective portion of its hedging instruments	$ 1,114	$ 393	$ (813)
Financial income (expense) related to derivative instruments		(670)	2,116
Derivative, Notional Amount	16,007	18,360
Cost of revenues of products [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in income related to the effective portion of its hedging instruments	158	53	(100)
Cost of revenues of services [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in income related to the effective portion of its hedging instruments	82	24	(55)
Research and development, net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in income related to the effective portion of its hedging instruments	440	154	(291)
Selling and marketing [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in income related to the effective portion of its hedging instruments	192	72	(180)
General and administrative [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in income related to the effective portion of its hedging instruments	$ 242	$ 90	$ (187)

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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+ References

No definition available.

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- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959

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- Definition

The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(h))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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