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EMPLOYEE BENEFIT PLANS - Weighted-Average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Pension Plan      
Weighted-average assumptions used to determine net periodic benefit cost      
Annualized returns obtained period 25 years    
Successor | Defined Benefit Pension Plan      
Weighted-average assumptions used to determine benefit obligations      
Discount rate (as a percent) 4.04% 4.29%  
Rate of compensation increase prior to age 40 (as a percent) 4.75% 4.75%  
Rate of compensation increase age 40 and above (as a percent) 3.75% 3.75%  
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate (as a percent) 4.29%    
Rate of compensation increase prior to age 40 (as a percent) 4.75% 4.75%  
Rate of compensation increase age 40 and above (as a percent) 3.75% 3.75%  
Expected long-term return on plan assets (as a percent) 7.25%    
Successor | Unfunded Excess Benefits Plan      
Weighted-average assumptions used to determine benefit obligations      
Discount rate (as a percent) 3.60% 3.63%  
Rate of compensation increase prior to age 40 (as a percent) 4.75% 4.75%  
Rate of compensation increase age 40 and above (as a percent) 3.75% 3.75%  
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate (as a percent) 3.63%    
Rate of compensation increase prior to age 40 (as a percent) 4.75% 4.75%  
Rate of compensation increase age 40 and above (as a percent) 3.75% 3.75%  
Successor | Group life insurance plan      
Weighted-average assumptions used to determine benefit obligations      
Discount rate (as a percent) 4.35%    
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate (as a percent) 4.60%    
Expected long-term return on plan assets (as a percent) 2.75%    
Predecessor | Defined Benefit Pension Plan      
Weighted-average assumptions used to determine benefit obligations      
Discount rate (as a percent)     3.55%
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate (as a percent)   3.95% 4.86%
Rate of compensation increase (as a percent)     3.00%
Expected long-term return on plan assets (as a percent)   7.50% 7.50%
Predecessor | Unfunded Excess Benefits Plan      
Weighted-average assumptions used to determine benefit obligations      
Discount rate (as a percent)     3.26%
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate (as a percent)   3.65% 4.30%
Rate of compensation increase (as a percent)     4.00%