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Voluntary Reorganization under Chapter 11 Proceedings - Narrative (Details) - USD ($) shares in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 10, 2017 | Oct. 04, 2016 | Oct. 01, 2016 | Feb. 28, 2017 | Feb. 09, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Dec. 31, 2018 | Oct. 31, 2018
Series A Warrants |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  |  |  |  |  |  | 4.6 |
Series B Warrants |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  |  |  |  |  |  | 2.0 |
Predecessor | 7.0% Convertible perpetual preferred stock |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Dividend rate, percentage |  |  |  |  |  |  | 7.00% |  |
Predecessor | 8.5% Convertible perpetual preferred stock |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Dividend rate, percentage |  |  |  |  |  |  | 8.50% |  |
Revolving Credit Facility | Amended New Credit Facility |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity | $ 425,000,000.0 |  |  |  |  |  |  |  | $ 350,000,000.0
Convertible Debt | New Convertible Notes |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  | $ 281,800,000 |  |  |  | $ 281,800,000 |  |
Common stock issued for debt (in shares) | 14.1 |  | 15.0 |  | 0.3 | 0.7 |  |  |
Fair value of debt |  |  | $ 445,700,000 |  |  |  | 445,700,000 |  |
Convertible Debt | Successor | New Convertible Notes |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Common stock issued for debt (in shares) |  |  |  | 14.1 |  |  |  |  |
Secured Notes | Building Note |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  | 35,000,000.0 |  |  |  | 35,000,000.0 |  |
Fair value of debt |  |  | 36,600,000 |  |  |  | $ 36,600,000 |  |
Proceeds from issuance of debt |  |  | $ 26,800,000 |  |  |  |  |  |
Plan of Reorganization | Predecessor | 7.0% Convertible perpetual preferred stock |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Dividend rate, percentage |  | 7.00% |  |  |  |  |  |  |
Plan of Reorganization | Predecessor | 8.5% Convertible perpetual preferred stock |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Dividend rate, percentage |  | 8.50% |  |  |  |  |  |  |
Plan of Reorganization | Successor | New Common Stock |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  | 18.9 |  |  |  |  |  |  |
Plan of Reorganization | Successor | New First Lien Exit Facility |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Cash collateral |  | $ 50,000,000.0 |  |  |  |  |  |  |
Plan of Reorganization | Successor | Holders of Senior Secured Notes | New Common Stock |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  | 13.7 |  |  |  |  |  |  |
Plan of Reorganization | Successor | Holders of Unsecured Claims |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Cash payments for prepetition obligations |  | $ 36,700,000 |  |  |  |  |  |  |
Plan of Reorganization | Successor | Holders of Unsecured Claims | Series A Warrants |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  | 4.5 |  |  |  |  |  |  |
Number of shares to be issued (in shares) |  | 4.9 |  |  |  |  |  |  |
Plan of Reorganization | Successor | Holders of Unsecured Claims | Series B Warrants |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  | 1.9 |  |  |  |  |  |  |
Number of shares to be issued (in shares) |  | 2.1 |  |  |  |  |  |  |
Plan of Reorganization | Successor | Holders of Unsecured Claims | New Common Stock |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  | 5.2 |  |  |  |  |  |  |
Number of shares to be issued (in shares) |  | 5.7 |  |  |  |  |  |  |
Plan of Reorganization | Revolving Credit Facility | Successor | New First Lien Exit Facility |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  | $ 425,000,000.0 |  |  |  |  |  |  |
Plan of Reorganization | Revolving Credit Facility | Successor | Holders of Senior Credit Facility |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Cash payments for prepetition obligations |  | 35,000,000.0 |  |  |  |  |  |  |
Plan of Reorganization | Convertible Debt | Successor | Holders of Senior Secured Notes |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  | 281,800,000 |  |  |  |  |  |  |
Plan of Reorganization | Secured Notes | Successor | Building Note |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  | 35,000,000.0 |  |  |  |  |  |  |
Fair value of debt |  | 36,600,000 |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 26,800,000 |  |  |  |  |  |  |

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