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RETIREMENT PLANS - Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Components of the plan's net periodic pension cost      
Settlements $ 1,725    
Pension benefits      
Components of the plan's net periodic pension cost      
Service cost 151 $ 229 $ 439
Interest cost 2,373 2,043 2,585
Expected return on plan assets (3,814) (3,366) (3,060)
Settlements 1,725 34 89
Net periodic pension cost 435 (1,060) 53
Postretirement benefits      
Components of the plan's net periodic pension cost      
Service cost 124 143 139
Interest cost 139 127 163
Amortization of actuarial (gain) loss     (11)
Net periodic pension cost $ 263 $ 270 $ 291