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Employee Benefit Plans - Schedule of Fair Value of Plan Assets (Details) - Pension Plans, Defined Benefit - USD ($)
$ in Thousands
Dec. 31, 2017
Aug. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Total $ 162,758 $ 162,929    
Fixed income securities        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fixed income securities 157,718      
Investments measured at net asset value 6,567      
Accounts payable – pending trades (1,527)      
Total 162,758      
Fixed income securities | Level 1        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fixed income securities 16,841      
Fixed income securities | Level 2        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fixed income securities 140,877      
Fixed income securities | Level 3        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fixed income securities $ 0      
Corporate Bond Securities        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fixed income securities allocation (as a percent) 80.00%   87.00%  
US Treasury and Government        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fixed income securities allocation (as a percent) 12.00%   4.00%  
Agency Securities        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fixed income securities allocation (as a percent) 3.00%   2.00%  
Other fixed income securities        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fixed income securities allocation (as a percent) 5.00%   7.00%  
Predecessor        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Total   $ 162,929 $ 157,714 $ 154,506
Predecessor | Fixed income securities        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fixed income securities     158,913  
Investments measured at net asset value     5,455  
Accounts payable – pending trades     (6,654)  
Total     157,714  
Predecessor | Fixed income securities | Level 1        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fixed income securities     16,427  
Predecessor | Fixed income securities | Level 2        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fixed income securities     142,486  
Predecessor | Fixed income securities | Level 3        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Fixed income securities     $ 0