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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Jan. 02, 2019 USD ($) | Jan. 02, 2018 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |
Outstanding options and RSU's excluded from the calculation of the diluted net loss per share | shares | 9,572,959 | 9,767,225 | 10,294,200 |  |
Advertising expense | $ 187,318 | $ 165,319 | $ 141,346 |  |
Severance pay expenses | $ 12,042 | $ 9,489 | 7,768 |  |
Severance pay rate | 8.33% |  |  |  |
Weighted average interest rates of short-term deposits | 2.86% | 2.84% |  |  |
Restricted deposits, weighted average interest rate | 0.06% | 0.05% |  |  |
Number of reporting units | 1 |  |  |  |
Useful life of intangible assets | 13 years |  |  |  |
Foreign currency derivative assets, fair value | $ 888 | $ 599 |  |  |
Foreign currency derivative liabilities, fair value | 0 | 940 |  |  |
Foreign currency derivative fair value, net | $ 888 | (341) |  |  |
Maximium plan contribution, percent of annual salary | 100.00% |  |  |  |
Maximum annual contribution to plan, per employee | $ 19 |  |  |  |
Employer matching contribution, percent of employee's contribution | 4.00% |  |  |  |
Defined contribution plan expenses | $ 727 | 587 | 334 |  |
Income (expenses) related to hedging activity | 963 | 1,434 | (7,101) |  |
Accumulated income (loss) on derivatives | 1,881 | (1,381) | 394 |  |
Capitalization of software development costs | 639 | 392 | 720 |  |
Deferred revenues | 289,148 | 227,226 | 202,482 |  | $ 177,103
ROU assets | 79,249 |  |  | $ 51,353 |
Lease liabilities | $ 83,193 |  |  | $ 52,448 |
Remaining lease term | 11 years |  |  |  |
Certain Employees Over 50 Years Of Age [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Maximum annual contribution to plan, per employee | $ 25 |  |  |  |
Not Designated as Hedging Instrument [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Foreign currency derivative assets, fair value | 577 | 1,974 |  |  |
Foreign currency derivative liabilities, fair value | 696 | 1,656 |  |  |
Foreign currency derivative fair value, net | $ 119 | 318 |  |  |
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Derivative notional amount | 78,302 |  |  |  |
Designated as Hedging Instrument [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Derivative notional amount | 56,101 |  |  |  |
Income (expenses) related to hedging activity | $ 147 | $ (1,687) | $ 5,417 |  |
Accumulated income (loss) on derivatives | 888 |  |  |  |
R&D projects [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Grants | $ 758 |  |  |  |

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