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COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Components of net periodic benefit cost:    
Interest cost $ 860 $ 1,054
Expected return on plan assets (1,671) (1,492)
Amortization of prior service cost 47 46
Amortization of net loss 1,141 1,064
Net periodic benefit cost 377 $ 672
2020 plan year    
Components of net periodic benefit cost:    
Employer contribution $ 3,300