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TAXES ON INCOME (Roll Forward of Valuation Allowance) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Taxes On Income Roll Forward Of Valuation Allowance        
Balance $ 43,053 $ 34,947 $ 26,166 $ 21,982
Additions $ 8,106 $ 8,781 $ 4,184