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RETIREMENT PLANS - Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jul. 22, 2021
Dec. 31, 2020
Pension benefits            
Components of the plan's net periodic pension cost            
Service cost $ 54 $ (164) $ 162 $ 682    
Interest cost 645 603 1,789 2,361    
Expected return on plan assets (833) (414) (2,207) (2,730)    
Actuarial (gain)/ loss   (7)   (21)    
Net periodic pension expense (benefit) (134) 18 (256) 292    
Projected benefit obligation         $ 15,400 $ 15,600
Plan Net Assets         12,100 $ 15,600
Company contributions     0 700    
Postretirement benefits            
Components of the plan's net periodic pension cost            
Service cost 35 32 105 96    
Interest cost 41 45 123 135    
Actuarial (gain)/ loss   (15)   (45)    
Net periodic pension expense (benefit) $ 76 $ 62 $ 228 $ 186    
Projected benefit obligation         $ 400