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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash equivalents maturities, months | 3 months |  |
Impairment charge | $ 0 | $ 0 | $ 0
Severance pay expense | 9,862 | 9,970 | 8,936
Expense for matching contributions | 7,044 | 3,930 | 4,310
Advertising expenses | 13,543 | 9,693 | 7,986
Retained earnings | 850,772 | 710,910 |
Assets | 2,845,086 | 2,631,876 |
Excess tax benefit from share-based payment arrangements |  | $ 7,868 | $ 7,595
Cumulative effect of deferred revenues | 39,000 |  |
Costs related to obtaining customer contracts | $ 45,000 |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Anti-dilutive securities excluded in computation of diluted earnings per share | 249,274 | 398,544 | 561,621
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 |  |
Warrant [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 |  |
Cumulative effect adjustment [Member] |  |  |
Retained earnings | $ 0 | $ 6,208 |
Assets | 0 |  |
Liabilities | $ 0 |  |

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