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RETIREMENT PLANS - Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Components of the plan's net periodic pension cost    
Company contributions $ 0 $ 0
Pension Plans    
Components of the plan's net periodic pension cost    
Service cost 447 448
Interest cost 841 820
Expected return on plan assets (1,263) (1,209)
Actuarial gain/ loss 7 30
Net periodic pension cost 32 89
Postretirement Benefits    
Components of the plan's net periodic pension cost    
Service cost 37 37
Interest cost 40 40
Actuarial gain/ loss (17) (17)
Net periodic pension cost $ 60 $ 60