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EMPLOYEE BENEFIT PLANS - Changes in obligations and assets (Details) - Defined Benefit Pension Items - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
CHANGE IN BENEFIT OBLIGATION:      
Benefit obligation at beginning of year $ 34,906 $ 50,287  
Service cost 1,071 1,419 $ 1,708
Interest cost 1,761 1,462 894
Actuarial loss (gain) 82 (9,787)  
Settlements   (7,541)  
Benefits paid (3,001) (934)  
Benefit obligation at end of year 34,819 34,906 50,287
CHANGE IN PLAN ASSETS:      
Fair value of plan assets at beginning of year 56,257 70,432  
Actual return on plan assets 6,079 (9,700)  
Employer contributions   4,000  
Settlements   (7,541)  
Benefits paid (3,001) (934)  
Fair value of plan assets at end of year 59,335 56,257 $ 70,432
Funded status of the plan $ 24,516 $ 21,351