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EMPLOYEE BENEFIT PLANS (Nonunion Plan Assets) (Details) - Nonunion Defined Benefit Pension Plan
 6 Months Ended 12 Months Ended
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Nonunion Defined Benefit Pension, Supplemental Benefit, and Postretirement Health Benefit Plans          
Period over which the possibility of experiencing a substantial loss is limited by adequate diversification under the long-term asset allocation policy     1 year    
Expected return on plan assets (as a percent) 2.50% 6.50% 1.40% 6.50% 6.50%
Target allocations, acceptable ranges, and actual asset allocations          
Target allocation (as a percent)     100.00%    
Weighted-Average Allocation (as a percent) 100.00%   100.00% 100.00%  
Maximum performance period of investment fund used to compare investment performance     3 years    
Minimum performance period of total fund used to compare investment performance     5 years    
Minimum          
Target allocations, acceptable ranges, and actual asset allocations          
Performance period of recognized market indices used to compare investment performance     3 years    
Maximum          
Target allocations, acceptable ranges, and actual asset allocations          
Performance period of recognized market indices used to compare investment performance     5 years    
Debt Instruments          
Target allocations, acceptable ranges, and actual asset allocations          
Target allocation (as a percent)     70.00%    
Weighted-Average Allocation (as a percent) 73.60%     73.60%  
Debt Instruments | Minimum          
Target allocations, acceptable ranges, and actual asset allocations          
Target allocation (as a percent)     20.00%    
Debt Instruments | Maximum          
Target allocations, acceptable ranges, and actual asset allocations          
Target allocation (as a percent)     100.00%    
Floating Rate Loan Fund          
Target allocations, acceptable ranges, and actual asset allocations          
Target allocation (as a percent)     10.00%    
Weighted-Average Allocation (as a percent) 13.10%   25.50% 13.10%  
Floating Rate Loan Fund | Minimum          
Target allocations, acceptable ranges, and actual asset allocations          
Target allocation (as a percent)     3.00%    
Floating Rate Loan Fund | Maximum          
Target allocations, acceptable ranges, and actual asset allocations          
Target allocation (as a percent)     100.00%    
Cash and Cash Equivalents          
Target allocations, acceptable ranges, and actual asset allocations          
Target allocation (as a percent)     20.00%    
Weighted-Average Allocation (as a percent) 13.30%   74.50% 13.30%  
Cash and Cash Equivalents | Minimum          
Target allocations, acceptable ranges, and actual asset allocations          
Target allocation (as a percent)     0.00%    
Cash and Cash Equivalents | Maximum          
Target allocations, acceptable ranges, and actual asset allocations          
Target allocation (as a percent)     100.00%