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SELECTED CONSOLIDATED STATEMENTS OF INCOME (LOSS) DATA (Schedule of Earnings (Loss) Per Share) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SELECTED STATEMENTS OF OPERATIONS DATA [Abstract]      
Net income available to holders of Ordinary shares $ 34,911 $ 36,538 $ 18,409
Denominator (number of shares in thousands):      
Weighted average number of shares 55,516,113 55,368,703 54,927,272
Add-employee stock options 67,000 662,000 826,000
Adjusted weighted average shares assuming exercise of options 55,583,474 56,030,976 55,752,642