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SELECTED STATEMENTS OF INCOME DATA (Schedule of Net Earnings Per Share) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement Related Disclosures [Abstract]      
Net income from continuing operations available to ordinary shareholders $ 143,291 $ 123,069 $ 140,578
Net income from discontinued operations available to ordinary shareholders (6,149) 118,253
Net income to ordinary shareholders $ 143,291 $ 116,920 $ 258,831
Denominator for basic net earnings per share - Weighted average number of shares 60,444 59,667 59,552
Effect of dilutive securities: Add - employee stock options and RSU 1,675 1,368 1,729
Denominator for diluted net earnings per share - adjusted weighted average shares 62,119 61,035 61,281