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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Components of net periodic benefit cost        
Pension settlement expense   $ 12,925 $ 4,156 $ 3,229
Nonunion Defined Benefit Pension Plan        
Components of net periodic benefit cost        
Interest cost   4,269 4,514 4,572
Expected return on plan assets   (1,582) (5,712) (8,607)
Pension settlement expense   12,925 4,156 3,023
Amortization of net actuarial loss   2,583 3,132 4,087
Net periodic benefit cost $ 12,600 18,195 6,090 3,075
Supplemental Benefit Plan        
Components of net periodic benefit cost        
Interest cost   108 102 130
Pension settlement expense       206
Amortization of net actuarial loss   81 82 152
Net periodic benefit cost   189 184 488
Postretirement Health Benefit Plan        
Components of net periodic benefit cost        
Service cost   366 489 429
Interest cost   837 1,060 1,017
Amortization of prior service credit   (93) (190) (190)
Amortization of net actuarial loss   304 694 705
Net periodic benefit cost   $ 1,414 $ 2,053 $ 1,961