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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 400  
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year 2,300  
Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 225 $ 137
Interest cost 1,123 1,083
Expected return on assets (1,189) (1,492)
Amortization of unrecognized prior service cost 56 50
Amortization of net unrecognized loss 765 676
Net periodic pension cost $ 980 $ 454