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OTHER LONG-TERM ASSETS (Schedule of Other Long-Term Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Other Assets, Noncurrent Disclosure [Abstract]    
Severance pay fund $ 14,859 $ 14,701
Long-term deposits 3,637 3,000
Investments in affiliate 1,000 1,000
Other long-term assets $ 19,496 $ 18,701