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TAXES ON INCOME (Schedule of Taxes on Income) (Domestic and Foreign) (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]        
Domestic   $ 27,673 $ 28,097 $ 24,812
Foreign   (41,304) (6,685) 6,020
Taxes on income $ 19,200 $ (13,631) $ 21,412 $ 30,832