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DERIVATIVE INSTRUMENTS (Effect of Derivative Instruments in Cash Flow Hedging Relationship on Income and Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Amount of gain (loss) recognized in other comprehensive income on derivative (effective portion)	$ 1,235	$ (600)	$ 954
Amount of gain (loss) reclassified from other comprehensive income into income (expenses) (effective portion)	(5,586)	(132)	4,010
Foreign Exchange Forward Contracts [Member]
Derivative [Line Items]
Amount of gain (loss) recognized in other comprehensive income on derivative (effective portion)	160	202
Foreign Exchange Forward Contracts [Member] | Cost of revenues and operating [Member]
Derivative [Line Items]
Amount of gain (loss) reclassified from other comprehensive income into income (expenses) (effective portion)	(3,157)
Foreign Exchange Option Contracts [Member]
Derivative [Line Items]
Amount of gain (loss) recognized in other comprehensive income on derivative (effective portion)	1,075	(802)	954
Foreign Exchange Option Contracts [Member] | Cost Of Revenues, Operating Expenses and Discontinued Operations [Member]
Derivative [Line Items]
Amount of gain (loss) reclassified from other comprehensive income into income (expenses) (effective portion)	$ (2,429)	$ (132)	$ 4,010

X

- 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 effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ 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 (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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+ References

No definition available.

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