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PENSION AND POSTRETIREMENT PLANS - Components of Net Periodic Benefit Cost (Credit): (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Pension Benefits        
Components of net periodic benefit (credit) cost and other amounts recognized in other comprehensive income:        
Service cost $ 265 $ 272 $ 530 $ 545
Interest cost 192 225 385 450
Expected return on plan assets (712) (607) (1,425) (1,215)
Amortization of net loss 100 130 200 260
Amortization of prior service credit (19) (19) (38) (38)
Net periodic benefit (credit) cost (174) 1 (348) 2
SERP Benefits        
Components of net periodic benefit (credit) cost and other amounts recognized in other comprehensive income:        
Service cost 93 66 186 131
Interest cost 37 36 74 73
Expected return on plan assets 0 0 0 0
Amortization of net loss 57 17 114 35
Amortization of prior service credit 0 0 0 0
Net periodic benefit (credit) cost $ 187 $ 119 $ 374 $ 239