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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Schedule of Maturities of Marketable Securities) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS [Abstract]  
Due within one year, Amortized cost $ 7,688
Due after one year through five years maturities, Amortized cost 106,238
Due within one year, Estimated fair value 7,679
Due after one year through five years maturities, Estimated fair value 105,489
Amortized cost 113,926
Estimated fair value $ 113,168