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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 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 $ 400   400  
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 168 $ 200 506 $ 728
Interest cost 702 857 2,115 2,595
Expected return on assets (1,505) (1,360) (4,519) (4,078)
Amortization of unrecognized prior service cost (14) 0 (46) 0
Amortization of net unrecognized loss 697 696 2,090 2,088
Net periodic pension cost $ 48 $ 393 $ 146 $ 1,333