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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative [Line Items] |  |  |
Amount of gain (loss) recognized in other comprehensive income on derivative, net of tax (effective portion) | $ (8,630) | $ 6,821 | $ 600
Amount of gain (loss) reclassified from other comprehensive income into income (expenses), net of tax (effective portion) | 4,781 | (5,586) | (132)
Foreign Exchange Forward Contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Amount of gain (loss) recognized in other comprehensive income on derivative, net of tax (effective portion) | (6,059) | 3,317 | (202)
Foreign Exchange Forward Contracts [Member] | Cost of revenues [Member] |  |  |
Derivative [Line Items] |  |  |
Amount of gain (loss) reclassified from other comprehensive income into income (expenses), net of tax (effective portion) | 4,715 | (3,157) |
Foreign Exchange Option Contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Amount of gain (loss) recognized in other comprehensive income on derivative, net of tax (effective portion) | (2,571) | 3,504 | 802
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), net of tax (effective portion) | $ 66 | $ (2,429) | $ (132)

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109978405&loc=d3e80720-113993 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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