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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

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