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LONG-TERM INVESTMENTS (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]    
Severance-pay funds, net $ 13,615 $ 13,317
Long-term interest bearing bank deposit 12,500 12,500
Others 9,830 256
Long-term investments, total $ 35,945 $ 26,073