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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Contributions by Employer     $ 900  
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year $ 1,100   1,100  
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 242 $ 205 528 $ 430
Interest cost 876 1,106 1,738 2,229
Expected return on assets (1,358) (1,188) (2,718) (2,377)
Amortization of unrecognized prior service cost 0 57 0 113
Amortization of net unrecognized loss 696 765 1,392 1,530
Net periodic pension cost $ 456 $ 945 $ 940 $ 1,925