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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 800  
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year 4,500  
Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 137 $ 225
Interest cost 1,083 1,171
Expected return on assets (1,492) (1,369)
Amortization of unrecognized prior service cost 50 34
Amortization of net unrecognized loss 676 674
Net periodic pension cost $ 454 $ 735