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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Contributions by Employer     $ 1,400  
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year $ 700   700  
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 200 $ 228 728 $ 658
Interest cost 857 1,075 2,595 3,304
Expected return on assets (1,360) (1,186) (4,078) (3,563)
Amortization of unrecognized prior service cost 0 56 0 169
Amortization of net unrecognized loss 696 766 2,088 2,296
Net periodic pension cost $ 393 $ 939 $ 1,333 $ 2,864