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RETIREMENT PLANS - Schedule of post-retirement benefits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Change in benefit obligation:      
Benefit obligation at January 1 $ 83,578 $ 106,496  
Service cost 628 1,190 $ 1,355
Interest cost 3,824 2,826 2,632
Actuarial (gain) loss 788 (21,350)  
Benefit obligation at December 31 84,523 83,578 106,496
Funded status at December 31 (10,406) (11,844)  
Supplemental Employee Retirement Plans, Defined Benefit      
Change in benefit obligation:      
Benefit obligation at January 1 3,175 4,015  
Service cost 21 34  
Interest cost 153 111  
Plan participants' contributions 84 74  
Actuarial (gain) loss 34 (758)  
Defined Benefit Plan, Benefit Obligation, Benefits Paid 277 301  
Benefit obligation at December 31 3,190 3,175 $ 4,015
Funded status at December 31 $ (3,190) $ (3,175)