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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Postretirement Medicare Plan [Member] |  |  |
Net periodic benefit cost |  |  |
Service cost | $ 10 | $ 9 | $ 12
Interest cost | 73 | 69 | 85
Amortization of prior service costs |  |  | (12)
Amortization of net loss (gain) | (262) | (361) | (333)
Total net periodic benefit cost | (179) | (283) | (248)
Other changes in plan assets and benefits obligations recognized in other comprehensive income: |  |  |
Prior service cost for the period |  |  |
Net loss (gain) for the period | (376) | 317 | (316)
Amortization of prior service costs |  |  | 12
Amortization of net gain (loss) | 262 | 361 | 333
Total recognized in other comprehensive income (loss) | (114) | 678 | 29
Total recognized in net periodic benefit cost and other comprehensive income (loss) | $ (293) | $ 395 | $ (219)
Weighted average assumptions used: |  |  |
Discount rate | 3.80% | 4.50% | 4.80%
Expected return on plan assets |  |  |
Rate of compensation increases |  |  |
Assumed health care cost trend rates: |  |  |
Measurement date | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Postretirement Medicare Plan [Member] | Pre 65 [Member] |  |  |
Assumed health care cost trend rates: |  |  |
Health care cost trend rate assumed for current year | 8.30% | 7.20% | 6.75%
Ultimate rate | 4.50% | 4.50% | 4.50%
Year the ultimate rate is reached | 2027 | 2025 | 2025
Postretirement Medicare Plan [Member] | Post 65 [Member] |  |  |
Assumed health care cost trend rates: |  |  |
Health care cost trend rate assumed for current year | 11.10% | 10.00% | 10.00%
Ultimate rate | 4.50% | 4.50% | 5.00%
Year the ultimate rate is reached | 2027 | 2025 | 2022
Pension Plan [Member] |  |  |
Net periodic benefit cost |  |  |
Interest cost | $ 749 | $ 831 | $ 841
Expected return on the plan's assets | (1,427) | (1,236) | (1,154)
Amortization of prior service costs | 3 | 3 | 3
Amortization of net loss (gain) |  | 55 | 34
Total net periodic benefit cost | (675) | (347) | (276)
Other changes in plan assets and benefits obligations recognized in other comprehensive income: |  |  |
Prior service cost for the period |  |  |
Net loss (gain) for the period | (231) | (1,303) | 736
Amortization of prior service costs | (3) | (3) | (3)
Amortization of net gain (loss) |  | (55) | (34)
Total recognized in other comprehensive income (loss) | (234) | (1,361) | 699
Total recognized in net periodic benefit cost and other comprehensive income (loss) | $ (909) | $ (1,708) | $ 423
Weighted average assumptions used: |  |  |
Discount rate | 3.70% | 4.30% | 4.60%
Expected return on plan assets | 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 recognized in net periodic benefit cost (credit) and other comprehensive (income) loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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