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TAXES ON INCOME (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |
Uncertain tax positions, beginning of year | $ 43,984 | $ 26,659
Increases in tax positions for prior years | 5,121 | 5,105
Increases in tax positions for current year | 13,353 | 15,140
Settlements | (3,471) |
Expiry of the statute of limitations | (427) | (2,920)
Uncertain tax positions, end of year | $ 58,560 | $ 43,984

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