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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
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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

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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 + Details
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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 + Details
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