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EMPLOYEE RELATED LIABILITIES (Schedule of Amounts Recognized in Statement of Financial Position) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Postretirement Medicare Plan [Member]      
Amounts recognized in statement of financial position:      
Current liabilities $ (65) $ (58) $ (37)
Non-current liabilities (1,563) (1,878) (1,513)
Net amount recognized $ (1,628) $ (1,936) $ (1,550)
Weighted average assumptions used:      
Discount rate 4.50% 3.80% 4.50%
Rate of compensation increases
Pension Plan [Member]      
Amounts recognized in statement of financial position:      
Non-current assets $ 3,691 $ 2,606 $ 199
Non-current liabilities
Net amount recognized $ 3,691 $ 2,606 $ 199
Weighted average assumptions used:      
Discount rate 4.40% 3.70% 4.30%
Rate of compensation increases
Pre 65 [Member] | Postretirement Medicare Plan [Member]      
Assumed health care cost trend rates:      
Health care cost trend rate assumed for next year 6.90% 8.30% 7.20%
Ultimate rate 4.50% 4.50% 4.50%
Year the ultimate rate is reached 2029 2027 2025
Pre 65 [Member] | Postretirement Non Medical Plan [Member]      
Assumed health care cost trend rates:      
Health care cost trend rate assumed for next year 6.90% 8.30% 7.20%
Post 65 [Member] | Postretirement Medicare Plan [Member]      
Assumed health care cost trend rates:      
Health care cost trend rate assumed for next year 13.10% 11.10% 10.00%
Ultimate rate 4.50% 4.50% 4.50%
Year the ultimate rate is reached 2029 2027 2025
Post 65 [Member] | Postretirement Non Medical Plan [Member]      
Assumed health care cost trend rates:      
Health care cost trend rate assumed for next year 7.90% 11.10% 10.00%