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COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Components of net periodic benefit cost:        
Interest cost $ 860 $ 1,054 $ 1,720 $ 2,108
Expected return on plan assets (1,671) (1,491) (3,342) (2,983)
Amortization of prior service cost 46 47 93 93
Amortization of net loss 1,142 1,063 2,283 2,127
Net periodic benefit cost $ 377 $ 673 754 $ 1,345
2020 plan year        
Components of net periodic benefit cost:        
Employer contribution     $ 3,300