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EMPLOYEE RELATED LIABILITIES (Schedule of Components of Net Periodic Benefit Cost Recognized in Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Postretirement Medical Plan [Member]      
Net periodic benefit cost      
Service cost $ 9 $ 12 $ 29
Interest cost 69 85 126
Amortization of prior service costs (12) (973)
Amortization of net (gain) or loss (361) (333) (115)
Total net periodic benefit cost (283) (248) (933)
Other changes in plan assets and benefits obligations recognized in other comprehensive income      
Prior service cost for the period
Net (gain) or loss for the period 317 (316) (1,333)
Amortization of prior service costs 12 973
Amortization of net gain or (loss) 361 333 115
Total recognized in other comprehensive income (expense) 678 29 (245)
Total recognized in net periodic benefit cost and other comprehensive income $ 395 $ (219) $ (1,178)
Weighted average assumptions used:      
Discount rate 4.50% 4.80% 4.30%
Expected return on plan assets, USA employees
Rate of compensation increases
Assumed health care cost trend rates:      
Measurement date Dec. 31, 2017 Dec. 31, 2016 Dec. 31, 2015
Postretirement Medical Plan [Member] | Pre 65 [Member]      
Assumed health care cost trend rates:      
Health care cost trend rate assumed for current year 7.20% 6.75% 7.00%
Ultimate rate 4.50% 4.50% 4.50%
Year the ultimate rate is reached 2025 2025 2025
Postretirement Medical Plan [Member] | Post 65 [Member]      
Assumed health care cost trend rates:      
Health care cost trend rate assumed for current year 10.00% 10.00% 20.00%
Ultimate rate 4.50% 5.00% 5.00%
Year the ultimate rate is reached 2025 2022 2022
Pension Plan [Member]      
Net periodic benefit cost      
Interest cost $ 831 $ 841 $ 798
Expected return on the plan's assets (1,236) (1,154) (1,130)
Amortization of prior service costs 3 3 3
Amortization of net (gain) or loss 55 34 31
Total net periodic benefit cost (347) (276) (298)
Other changes in plan assets and benefits obligations recognized in other comprehensive income      
Prior service cost for the period
Net (gain) or loss for the period (1,303) 736 6
Amortization of prior service costs (3) (3) (3)
Amortization of net gain or (loss) (55) (34) (31)
Total recognized in other comprehensive income (expense) (1,361) 699 (28)
Total recognized in net periodic benefit cost and other comprehensive income $ (1,708) $ 423 $ (326)
Weighted average assumptions used:      
Discount rate 4.30% 4.60% 4.20%
Expected return on plan assets, USA employees 6.20% 6.20% 6.20%
Rate of compensation increases