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EMPLOYEE RELATED LIABILITIES (Schedule of Future Benefit Payments) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Postretirement Medical Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 59
2019 73
2020 71
2021 74
2022 77
2023 - 2027 404
Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 764
2019 850
2020 935
2021 998
2022 1,058
2023 - 2027 $ 5,865