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SELECTED STATEMENTS OF INCOME DATA (Schedule of Net Earnings Per Share) (Details) - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement Related Disclosures [Abstract]      
Net income to ordinary shareholders $ 196,346 $ 185,904 $ 159,338
Weighted average number of shares 62,710 62,120 61,387
Effect of dilutive securities: Add - employee stock options and RSU (in shares) 1,611 1,682 1,785
Warrants issued in the exchangeable notes transaction (in shares) 1,635 859 137
Denominator for diluted net earnings per share - adjusted weighted average shares (in shares) 65,956 64,661 63,309