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EMPLOYEE RELATED LIABILITIES (Schedule of Estimated Amounts in Accumulated Other Comprehensive Income to be Recognized over the Next Fiscal Year) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Postemployment Benefits [Abstract]      
Prior service cost $ 3 $ 3 $ 3
Net actuarial (gain) or loss $ 0 $ 54 $ 33