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SIGNIFICANT ACCOUNTING POLICIES (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | $ (525) |  |
Changes in other comprehensive income (loss) before reclassifications | 914 |  |
Amounts reclassified from accumulated other comprehensive income (loss) to : |  |  |
Net current-period other comprehensive income (loss) | 671 | $ 242 | $ (803)
Balance | 146 | (525) |
Unrealized gains (losses) on cash flow hedges [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | (846) |  |
Changes in other comprehensive income (loss) before reclassifications | 723 |  |
Amounts reclassified from accumulated other comprehensive income (loss) to : |  |  |
Net current-period other comprehensive income (loss) | 520 |  |
Balance | (326) | (846) |
Unrealized gain (losses) on marketable securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | 321 |  |
Changes in other comprehensive income (loss) before reclassifications | 191 |  |
Amounts reclassified from accumulated other comprehensive income (loss) to : |  |  |
Net current-period other comprehensive income (loss) | 151 |  |
Balance | 472 | $ 321 |
Cost of revenues [Member] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) to : |  |  |
Amounts reclassified from accumulated other comprehensive income | (5) |  |
Cost of revenues [Member] | Unrealized gains (losses) on cash flow hedges [Member] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) to : |  |  |
Amounts reclassified from accumulated other comprehensive income | (5) |  |
Cost of revenues [Member] | Unrealized gain (losses) on marketable securities [Member] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) to : |  |  |
Amounts reclassified from accumulated other comprehensive income |  |  |
Operating expenses [Member] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) to : |  |  |
Amounts reclassified from accumulated other comprehensive income | (198) |  |
Operating expenses [Member] | Unrealized gains (losses) on cash flow hedges [Member] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) to : |  |  |
Amounts reclassified from accumulated other comprehensive income | (198) |  |
Operating expenses [Member] | Unrealized gain (losses) on marketable securities [Member] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) to : |  |  |
Amounts reclassified from accumulated other comprehensive income |  |  |
Financial income, net [Member] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) to : |  |  |
Amounts reclassified from accumulated other comprehensive income | (40) |  |
Financial income, net [Member] | Unrealized gains (losses) on cash flow hedges [Member] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) to : |  |  |
Amounts reclassified from accumulated other comprehensive income |  |  |
Financial income, net [Member] | Unrealized gain (losses) on marketable securities [Member] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) to : |  |  |
Amounts reclassified from accumulated other comprehensive income | $ (40) |  |

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