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RETIREMENT PLANS - Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Components of the plan's net periodic pension cost        
Settlements       $ 369
Pension benefits        
Components of the plan's net periodic pension cost        
Service cost $ 22 $ 38 $ 45 76
Interest cost 824 593 1,649 1,187
Expected return on plan assets (729) (953) (1,459) (1,905)
Amortization of unrecognized actuarial gain (11)   (21)  
Settlements       369
Net periodic pension expense (benefit) 106 (322) 214 (273)
Postretirement benefits        
Components of the plan's net periodic pension cost        
Service cost 16 31 33 62
Interest cost 45 35 90 70
Amortization of unrecognized actuarial gain (28)   (56)  
Net periodic pension expense (benefit) $ 33 $ 66 $ 67 $ 132