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EMPLOYEE BENEFIT PLANS (Effect of One-percentage-point Change in Assumed Health Care Cost Trend Rates) (Details) - Post Retirement Medical Plan [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Effect on total of service and interest cost components, 1% increase $ 15
Effect on total of service and interest cost components, 1% decrease (14)
Effect on accumulated postretirement benefit obligation, 1% increase 307
Effect on accumulated postretirement benefit obligation, 1% decrease $ (291)