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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Contributions by Employer     $ 1,200  
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year $ 1,600   1,600  
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 205 $ 141 430 $ 278
Interest cost 1,106 1,098 2,229 2,181
Expected return on assets (1,188) (1,491) (2,377) (2,983)
Amortization of unrecognized prior service cost 57 50 113 100
Amortization of net unrecognized loss 765 690 1,530 1,366
Net periodic pension cost $ 945 $ 488 $ 1,925 $ 942