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INCOME TAX (Schedule of Income Before Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
The Company and its Israeli subsidiaries $ 22,138 $ 22,634 $ 23,987
Non-Israeli subsidiaries 33,408 27,420 17,846
Income before income tax $ 55,546 $ 50,054 $ 41,833