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EMPLOYEE RELATED LIABILITIES (Schedule of Impact of One-Percentage Point Change in Assumed Health Care Cost) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Postemployment Benefits [Abstract]  
Effect on service cost and interest cost, Increase $ 4
Effect on postretirement obligation, Increase 78
Effect on service cost and interest cost, Decrease (3)
Effect on postretirement obligation, Decrease $ (61)