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TAXES ON INCOME (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Taxes on Income [Line Items]      
Income before taxes on income, as reported in the consolidated statements of income $ 129,660 $ 144,481 $ 171,410
Statutory tax rate in Israel 24.00% 25.00% 26.50%
Preferred Enterprise benefits [1] (16.80%) (8.90%) (6.10%)
Changes in valuation allowance 0.00% 1.00% (0.40%)
Earnings taxed under foreign law (4.60%) (7.70%) (4.00%)
Tax settlements and other adjustments 14.30% 5.80% 1.10%
U.S. Tax Reform one-time adjustment (23.90%)
Other (3.50%) (0.40%) 0.90%
Effective tax rate (10.50%) 14.80% 18.00%
Basic $ 2.37 $ 1.96 $ 4.35
Diluted 2.31 1.92 4.22
Approved, Privileged and Preferred Enterprise [Member]      
Taxes on Income [Line Items]      
Basic 0.36 0.22 0.18
Diluted $ 0.35 $ 0.21 $ 0.17
[1] The effect of the benefit resulting from the "Preferred Enterprise" status on net earnings per ordinary share is as follows: