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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash equivalents maturities, months | 3 months |  |
Impairment charge | $ 0 | $ 0 | $ 0
Severance pay expense | 13,453,000 | 9,862,000 | 9,970,000
Employee contribution amount, max per year | 18,500 | 18,000 | 18,000
Employees over 50 years of age maximum annual contribution per year | $ 24,500 | 24,000 | 24,000
Employee contribution percentage, minimum | 6.00% |  |
Employee contribution percentage, maximum | 8.00% |  |
Employer percent of match | 50.00% |  |
Expense for matching contributions | $ 7,732,000 | 7,044,000 | 3,930,000
Advertising expenses | 13,527,000 | 13,543,000 | $ 9,693,000
Retained earnings | 1,071,811,000 | 850,772,000 |
Assets | 3,207,366,000 | $ 2,845,086,000 |
Cumulative effect of deferred revenues | 38,670,000 |  |
Costs related to obtaining customer contracts | 38,956,000 |  |
Decrease in tax related accounts | 15,925,000 |  |
Revenue remaining performance obligation | 705,000 |  |
Lease liabilities for operating leases | $ 120,000,000 |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Anti-dilutive securities excluded in computation of diluted earnings per share | 108,617 | 62,319 | 99,636
Minimum [Member] |  |  |
Employer percent of match | 6.00% |  |
Maximum [Member] |  |  |
Employer percent of match | 8.00% |  |
Exchangeable Note Hedge [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Anti-dilutive securities excluded in computation of diluted earnings per share | 3,457,475 |  |

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