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EMPLOYEE BENEFIT PLANS - Components of net periodic cost (benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
EMPLOYEE BENEFIT PLANS      
Settlement loss $ 2,363 $ 1,180  
Retirement Income Plan      
EMPLOYEE BENEFIT PLANS      
Service cost for benefits earned during the period 0 0 $ 0
Interest cost 5 133 147
Expected return on plan assets     (289)
Amortization of net losses 22 113 73
Settlement loss 2,363 1,180  
Net periodic cost $ 2,390 $ 1,426 $ (69)