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EMPLOYEE BENEFIT PLANS (Discount rate and assumptions) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2017
Jan. 01, 2017
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Nonunion Defined Benefit Pension Plan                            
Weighted-average assumptions used to determine nonunion benefit obligations                            
Discount rate (as a percent)         3.90%               3.90%  
Weighted-average assumptions used to determine net periodic benefit cost                            
Discount rate (as a percent)     3.70% 3.80% 3.60% 3.80% 3.60% 3.10% 3.20% 3.40%   3.90% 3.10% 3.40%
Expected return on plan assets, net of estimated expenses (as a percent) 2.50% 6.50% 0.00% 0.00%             2.50% 1.40% 1.40% 6.50%
Supplemental Benefit Plan                            
Weighted-average assumptions used to determine nonunion benefit obligations                            
Discount rate (as a percent)         3.60%             2.40% 3.60%  
Weighted-average assumptions used to determine net periodic benefit cost                            
Discount rate (as a percent)                       3.60% 2.80% 2.70%
Postretirement Health Benefit Plan                            
Weighted-average assumptions used to determine nonunion benefit obligations                            
Discount rate (as a percent)         4.20%             3.10% 4.20%  
Weighted-average assumptions used to determine net periodic benefit cost                            
Discount rate (as a percent)                       4.20% 3.50% 4.00%