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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Postretirement Medical Plan [Member] |  |  |
Amounts recognized in statement of financial position: |  |  |
Current liabilities | $ (58) | $ (37) | $ (40)
Non-current liabilities | (1,878) | (1,513) | (1,741)
Net amount recognized | $ (1,936) | $ (1,550) | $ (1,781)
Weighted average assumptions used: |  |  |
Discount rate | 3.80% | 4.50% | 4.80%
Rate of compensation increases |  |  |
Pension Plan [Member] |  |  |
Amounts recognized in statement of financial position: |  |  |
Non-current assets | $ 2,606 | $ 199 |
Non-current liabilities |  |  | (79)
Net amount recognized | $ 2,606 | $ 199 | $ (79)
Weighted average assumptions used: |  |  |
Discount rate | 3.70% | 4.30% | 4.60%
Rate of compensation increases |  |  |
Pre 65 [Member] | Postretirement Medical Plan [Member] |  |  |
Assumed health care cost trend rates: |  |  |
Health care cost trend rate assumed for next year | 8.30% | 7.20% | 6.75%
Ultimate rate | 4.50% | 4.50% | 4.50%
Year the ultimate rate is reached | 2027 | 2025 | 2025
Post 65 [Member] | Postretirement Medical Plan [Member] |  |  |
Assumed health care cost trend rates: |  |  |
Health care cost trend rate assumed for next year | 11.10% | 10.00% | 10.00%
Ultimate rate | 4.50% | 4.50% | 5.00%
Year the ultimate rate is reached | 2027 | 2025 | 2022

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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as current. Excludes other postretirement benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1731-114919 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 + Details
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