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RETIREMENT PLANS - Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Components of the plan's net periodic pension cost        
Settlements     $ 369 $ 1,725
Pension benefits        
Components of the plan's net periodic pension cost        
Service cost $ 38 $ 57 76 114
Interest cost 593 565 1,187 1,130
Expected return on plan assets (953) (925) (1,905) (1,850)
Settlements   1,725 369 1,725
Net periodic pension expense (benefit) (322) 1,422 (273) 1,119
Postretirement benefits        
Components of the plan's net periodic pension cost        
Service cost 31 36 62 72
Interest cost 35 33 70 66
Net periodic pension expense (benefit) $ 66 $ 69 $ 132 $ 138