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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cash equivalents maturities, months | 3 months |  |  |
Impairment charge | $ 0 | $ 0 | $ 0 |
Deferred revenue recognized | 226,500,000 |  |  |
Commission expense | 93,081,000 | 76,776,000 | 92,166,000 |
Severance pay expense | $ 7,656,000 | 13,453,000 | 9,862,000 |
Employees over 50 years of age minimum annual contribution per year | 6.00% |  |  |
Employees over 50 years of age maximum annual contribution per year | 8.00% |  |  |
Employee contribution amount, max per year | $ 19,000 | 18,500 | 18,000 |
Employees over 50 years of age maximum annual contribution per year | $ 25,000 | 24,500 | 24,000 |
Employer matching contribution percentage | 50.00% |  |  |
Contribution expense | $ 8,068,000 | 7,732,000 | 7,044,000 |
Advertising expenses | 16,040,000 | $ 13,527,000 | $ 13,543,000 |
Operating lease right-of-use assets | 106,196,000 |  |  |
Operating lease liability | $ 125,009,000 |  |  |
Exchangeable Note Hedge |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Anti-dilutive securities excluded in computation of diluted earnings per share (in shares) | 3,457,475 |  |  |
Employee Stock Option |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Anti-dilutive securities excluded in computation of diluted earnings per share (in shares) | 4,921 | 108,617 | 62,319 |
Accounting Standards Update 2016-02 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating lease right-of-use assets |  |  |  | $ 120,600,000
Operating lease liability |  |  |  | $ 139,200,000
Minimum |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Employer matching contribution percentage | 6.00% |  |  |
Maximum |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Employer matching contribution percentage | 8.00% |  |  |

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