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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 1,700      
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year 3,700   $ 3,700  
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 141 $ 128 278 $ 353
Interest cost 1,098 1,163 2,181 2,334
Expected return on assets (1,491) (1,368) (2,983) (2,737)
Amortization of unrecognized prior service cost 50 34 100 68
Amortization of net unrecognized loss 690 655 1,366 1,329
Net periodic pension cost $ 488 $ 612 $ 942 $ 1,347