TAXES ON INCOME (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Earnings (loss) before taxes on income [Abstract]
Earnings (loss) before taxes on income	$ 42,531	$ 40,998
Federal [Abstract]
Current	0	3,934
Deferred	8,509	8,562
State and local [Abstract]
Current	807	857
Deferred	337	0
Foreign - current	212	0
Total Provision for taxes on income	9,865	13,353
United States [Member]
Earnings (loss) before taxes on income [Abstract]
Earnings (loss) before taxes on income	43,544	40,998
Foreign [Member]
Earnings (loss) before taxes on income [Abstract]
Earnings (loss) before taxes on income	$ (1,013)	$ 0

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