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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |  |
Amount of gain (loss) recognized in other comprehensive income on derivative, net of tax (effective portion) | $ 5,495 |  |
Amount of gain (loss) recognized in other comprehensive income on derivative, net of tax (effective portion) |  | $ (8,630) | $ 6,821
Amount of gain (loss) reclassified from other comprehensive income into income (expenses), net of tax (effective portion) | 429 |  |
Amount of gain (loss) reclassified from other comprehensive income into income (expenses), net of tax (effective portion) |  | (4,781) | 5,586
Foreign Exchange Option |  |  |
Derivative [Line Items] |  |  |
Amount of gain (loss) recognized in other comprehensive income on derivative, net of tax (effective portion) | 3,387 |  |
Amount of gain (loss) recognized in other comprehensive income on derivative, net of tax (effective portion) |  | (2,571) | 3,504
Foreign Exchange Option | Cost Of Revenues, Operating Expenses and Discontinued Operations |  |  |
Derivative [Line Items] |  |  |
Amount of gain (loss) reclassified from other comprehensive income into income (expenses), net of tax (effective portion) | 320 |  |
Amount of gain (loss) reclassified from other comprehensive income into income (expenses), net of tax (effective portion) |  | 66 | (2,429)
Foreign Exchange Forward |  |  |
Derivative [Line Items] |  |  |
Amount of gain (loss) recognized in other comprehensive income on derivative, net of tax (effective portion) | 2,108 |  |
Amount of gain (loss) recognized in other comprehensive income on derivative, net of tax (effective portion) |  | (6,059) | 3,317
Foreign Exchange Forward | Cost of revenues |  |  |
Derivative [Line Items] |  |  |
Amount of gain (loss) reclassified from other comprehensive income into income (expenses), net of tax (effective portion) | $ (749) |  |
Amount of gain (loss) reclassified from other comprehensive income into income (expenses), net of tax (effective portion) |  | $ 4,715 | $ (3,157)

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- Definition Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109974929&loc=SL110061190-113977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -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 5: http://www.xbrl.org/2003/role/disclosureRef -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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- Definition Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41638-113959 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL34724391-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e689-108580 Reference 4: 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 + Details
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