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Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 10, 2017 | Oct. 04, 2016 | Feb. 09, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Feb. 09, 2017 | Sep. 30, 2016
Successor |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  | 35,801,000 | 21,042,000 |  |  |
Common stock, par value (in dollars per share) |  |  |  | $ 0.001 | $ 0.001 |  |  |
Successor | New Common Stock |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Common stock, shares issued |  | 18,900,000 |  |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.001 |  |  |  |  |  |
Common stock, shares reserved for distribution |  | 400,000 |  |  |  |  |  |
Shares issued |  |  |  | 100,000 |  |  |  |
Successor | Series A Warrants |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Number of shares to be issued |  | 4,900,000 |  |  |  |  |  |
Number of common shares exercised for each warrant |  | 1 |  |  |  |  |  |
Issuance of warrants for general unsecured claims (in shares) |  | 4,500,000 |  | 100,000 |  |  |  |
Successor | Series B Warrants |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Number of shares to be issued |  | 2,100,000 |  |  |  |  |  |
Number of common shares exercised for each warrant |  | 1 |  |  |  |  |  |
Issuance of warrants for general unsecured claims (in shares) |  | 1,900,000 |  |  |  |  |  |
Successor | Holders of Unsecured Claims | Series A Warrants |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Exercise price (in usd per share) |  | $ 41.34 |  |  |  |  |  |
Successor | Holders of Unsecured Claims | Series B Warrants |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Exercise price (in usd per share) |  | $ 42.03 |  |  |  |  |  |
Successor | Convertible Notes | Convertible Senior Unsecured Notes |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Common stock issued for debt exchange (in shares) | 14,100,000 | 15,000,000.0 | 300,000 |  | 700,000 |  | 1,000,000.0 |
Predecessor | 8.5% Convertible perpetual preferred stock |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  | 8.50% |  | 8.50%
Preferred dividends in arrears |  |  |  |  |  |  |  | $ 11.3
Predecessor | 7.0% Convertible perpetual preferred stock |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  |  |  | 7.00%
Preferred dividends in arrears |  |  |  |  |  |  |  | $ 21.0

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