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EMPLOYEE BENEFIT PLANS (Pre-tax Amounts Recognized in Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Prior service costs | $ 0 | $ 462 | $ 0
Net actuarial loss (gain) | 1,877 | 5,015 | 176
Amortization of losses and prior service cost | (826) | (1,410) | (1,096)
Total changes in other comprehensive income (loss) | 1,051 | 4,067 | (920)
Post Retirement Medical Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Prior service costs | 0 | 0 | 2,524
Net actuarial loss (gain) | (3,388) | (2,471) | 1,487
Amortization of losses and prior service cost | (646) | (646) | (541)
Total changes in other comprehensive income (loss) | $ (4,034) | $ (3,117) | $ 3,470

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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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