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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
Dec. 31, 2015
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%     6.50% 6.50%
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 100.00%     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    
Forecast            
Nonunion Defined Benefit Pension, Supplemental Benefit, and Postretirement Health Benefit Plans            
Expected return on plan assets (as a percent)     1.40%      
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    
Large Cap U.S. Equity            
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 0.00%     0.00%    
Weighted-Average Allocation (as a percent) 0.00%     0.00% 14.00%  
Large Cap U.S. Equity | Minimum            
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 0.00%     0.00%    
Large Cap U.S. Equity | Maximum            
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 20.00%     20.00%    
Mid Cap U.S. Equity            
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 0.00%     0.00%    
Weighted-Average Allocation (as a percent) 0.00%     0.00% 9.40%  
Mid Cap U.S. Equity | Minimum            
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 0.00%     0.00%    
Mid Cap U.S. Equity | Maximum            
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 11.00%     11.00%    
Small Cap U.S. Equity            
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 0.00%     0.00%    
Weighted-Average Allocation (as a percent) 0.00%     0.00% 10.00%  
Small Cap U.S. Equity | Minimum            
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 0.00%     0.00%    
Small Cap U.S. Equity | Maximum            
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 11.00%     11.00%    
International Equity            
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 0.00%     0.00%    
Weighted-Average Allocation (as a percent) 0.00%     0.00% 14.40%  
International Equity | Minimum            
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 0.00%     0.00%    
International Equity | Maximum            
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 18.00%     18.00%    
Debt Instruments            
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 70.00%     70.00%    
Weighted-Average Allocation (as a percent) 73.60%     73.60% 25.00%  
Debt Instruments | Minimum            
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 20.00%     20.00%    
Debt Instruments | Maximum            
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 100.00%     100.00%    
Actively managed portfolio of short-term debt instruments | Minimum            
Target allocations, acceptable ranges, and actual asset allocations            
Maturity period of investments       1 year    
Actively managed portfolio of short-term debt instruments | Maximum            
Target allocations, acceptable ranges, and actual asset allocations            
Maturity period of investments       5 years    
Actively managed portfolio of short-duration debt instruments | Minimum            
Target allocations, acceptable ranges, and actual asset allocations            
Maturity period of investments       1 year    
Actively managed portfolio of short-duration debt instruments | Maximum            
Target allocations, acceptable ranges, and actual asset allocations            
Maturity period of investments       3 years    
Floating Rate Loan Fund            
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 10.00%     10.00%    
Weighted-Average Allocation (as a percent) 13.10%     13.10% 10.80%  
Floating Rate Loan Fund | Minimum            
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 3.00%     3.00%    
Floating Rate Loan Fund | Maximum            
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 100.00%     100.00%    
Cash and Cash Equivalents            
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 20.00%     20.00%    
Weighted-Average Allocation (as a percent) 13.30%     13.30% 16.40%  
Cash and Cash Equivalents | Minimum            
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 0.00%     0.00%    
Cash and Cash Equivalents | Maximum            
Target allocations, acceptable ranges, and actual asset allocations            
Target allocation (as a percent) 100.00%     100.00%