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TAXES ON INCOME (Schedule Of Changes In Unrecognized Tax Benefits) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Uncertain tax positions, beginning of year $ 4,686 $ 6,942
Decreases in tax positions for prior years (3,880) (4,362)
Increases in tax positions for prior years 49 620
Increase in tax position for current year 1,305 1,486
Uncertain tax positions, end of year $ 2,160 $ 4,686