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Net Income (Loss) per Share - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Jul. 31, 2017
Jun. 13, 2017
May 17, 2017
Mar. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2016
Sep. 30, 2017
Successor                
Class of Stock [Line Items]                
Dividends paid (in dollars per share)     $ 0.05 $ 3.56        
Dividends paid   $ 2,700   $ 190,000 $ 2,677 $ 0 $ 0 $ 195,350
Cash dividends $ 2,700              
Restricted Stock | 2016 Equity Plan | Successor                
Class of Stock [Line Items]                
Common stock issues to employees and directors, unvested (in shares)         798,124     798,124
Restricted Stock | 2017 Equity Plan | Successor                
Class of Stock [Line Items]                
Common stock issues to employees and directors, unvested (in shares)         17,582     17,582
Phantom Share Units (PSUs) | 2016 Equity Plan                
Class of Stock [Line Items]                
Settlement period               5 years
Phantom Share Units (PSUs) | 2016 Equity Plan | Successor                
Class of Stock [Line Items]                
Common stock shares issued (in shares)               43,580
Phantom Share Units (PSUs) | 2017 Equity Plan                
Class of Stock [Line Items]                
Settlement period               5 years
Restricted Stock Units (RSUs) | 2017 Equity Plan | Successor                
Class of Stock [Line Items]                
Common stock shares issued (in shares)               13,157