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COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Components of net periodic benefit cost:        
Interest cost $ 860 $ 1,030 $ 2,580 $ 3,138
Expected return on plan assets (1,671) (1,413) (5,013) (4,396)
Amortization of prior service cost 47 47 140 140
Amortization of net loss 1,141 969 3,424 3,096
Net periodic benefit cost $ 377 $ 633 1,131 $ 1,978
2020 plan year        
Components of net periodic benefit cost:        
Employer contribution     $ 3,300