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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
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 $ 1,300   1,300  
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 181 $ 242 338 $ 528
Interest cost 713 876 1,413 1,738
Expected return on assets (1,508) (1,358) (3,014) (2,718)
Amortization of unrecognized prior service cost (32) 0 (32) 0
Amortization of net unrecognized loss 696 696 1,393 1,392
Net periodic pension cost $ 50 $ 456 $ 98 $ 940