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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 |  |  |

X
- Definition The assumed health care cost trend rate for the current year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References No definition available. + Details
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- Definition Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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- Definition Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income from prior service cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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