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TAXES ON INCOME (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
TAXES ON INCOME [Abstract]        
Earnings before taxes on income - United States $ 47,861 $ 51,559 $ 131,874 $ 175,376
Federal [Abstract]        
Current 3,617 1,190 13,605 14,281
Deferred 14,132 16,582 32,783 46,264
State and local 1,323 1,434 3,080 4,885
Total Provision for taxes on income $ 19,072 $ 19,206 49,468 65,430
ASU 2016-09 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Increase (decrease) in provision for taxes on income     $ 1,060 $ (1,780)