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RETIREMENT PLANS - Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Pension Plans          
Components of the plan's net periodic pension cost          
Service cost $ (164) $ 447 $ 682 $ 1,342  
Interest cost 603 841 2,361 2,524  
Expected return on plan assets (414) (1,263) (2,730) (3,790)  
Actuarial (gain)/ loss (7) 7 (21) 22  
Net periodic pension expense 18 32 292 98  
Company contributions     700 300  
Funded status of plan          
Plan Net Assets         $ 15,100
Projected benefit obligation         $ 15,600
Postretirement Benefits          
Components of the plan's net periodic pension cost          
Service cost 32 37 96 111  
Interest cost 45 40 135 120  
Actuarial (gain)/ loss (15) (17) (45) (51)  
Net periodic pension expense $ 62 $ 60 $ 186 $ 180