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LONG-TERM INVESTMENTS (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]    
Severance pay funds, net $ 13,317 $ 9,909
Long-term interest bearing bank deposit 12,500 12,500
Others 256 3,215
Long-term investments, total $ 26,073 $ 25,624