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EMPLOYEE BENEFIT PLANS (Components of cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Components of net periodic benefit cost        
Pension settlement expense   $ 8,505 $ 12,925 $ 4,156
Noncash charge to pension settlement expense   4,000    
Nonunion Defined Benefit Pension Plan        
Components of net periodic benefit cost        
Interest cost   624 4,269 4,514
Expected return on plan assets   (31) (1,582) (5,712)
Pension settlement expense   4,164 12,925 4,156
Amortization of net actuarial loss   260 2,583 3,132
Net periodic benefit cost $ 12,600 5,017 18,195 6,090
Noncash charge to pension settlement expense   4,000    
Supplemental Benefit Plan        
Components of net periodic benefit cost        
Interest cost   39 108 102
Pension settlement expense   370    
Amortization of net actuarial loss   95 81 82
Net periodic benefit cost   504 189 184
Postretirement Health Benefit Plan        
Components of net periodic benefit cost        
Service cost   320 366 489
Interest cost   1,212 837 1,060
Amortization of prior service credit   (33) (93) (190)
Amortization of net actuarial loss   898 304 694
Net periodic benefit cost   $ 2,397 $ 1,414 $ 2,053