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EMPLOYEE BENEFIT PLANS (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Plan
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Defined benefit plan [Abstract]      
Number of defined benefit plans | Plan 2    
Defined Benefit Plan, Type [Extensible List] us-gaap:DefinedBenefitPostretirementHealthCoverageMember    
Defined Benefit Plan, Funding Status [Extensible List] us-gaap:UnfundedPlanMember    
Components of net periodic benefit cost [Abstract]      
Service cost $ 39 $ 34  
Interest cost 22 23  
Amortization of prior service cost 35 38  
Amortization of gain (2) (8)  
Net periodic benefit cost 94 $ 87  
Amount recognized in consolidated balance sheet for benefit obligations (included in other long-term obligations) 1,634   $ 1,573
Deferred compensation liability 0    
Maximum [Member]      
Components of net periodic benefit cost [Abstract]      
Historical cash payments for retirement medical plan claims per year $ 100