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COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Components of net periodic benefit cost:        
Interest cost $ 1,030 $ 1,217 $ 3,138 $ 3,649
Expected return on plan assets (1,413) (1,233) (4,396) (3,699)
Amortization of prior service cost 47 46 140 139
Amortization of net loss 969 980 3,096 2,941
Net periodic benefit cost $ 633 $ 1,010 1,978 $ 3,030
2019 plan year        
Components of net periodic benefit cost:        
Employer contribution     $ 1,700