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Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 04, 2016 | Oct. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |
Additional paid-in capital—stockholder receivable |  |  | $ (1,250) |  | $ (1,250) |  | $ (1,250)
Common stock issued for debt exchange (in shares) |  |  |  |  | 84,400,000 |  |
Common stock, shares issued |  |  | 720,936,000 |  | 720,936,000 |  | 635,584,000
Common stock, par value (in dollars per share) |  |  | $ 0.001 |  | $ 0.001 |  | $ 0.001
8.5% Convertible perpetual preferred stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  | 8.50% | 8.50% | 8.50% | 8.50%
Preferred dividends in arrears |  |  |  |  | $ 11,300 |  |
7.0% Convertible perpetual preferred stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  | 7.00% | 7.00% | 7.00% | 7.00%
Preferred dividends in arrears |  |  |  |  | $ 21,000 |  |
Stockholder Receivable |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Additional paid-in capital—stockholder receivable |  |  | $ (1,300) |  | $ (1,300) |  |
Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock issued for debt exchange (in shares) |  |  |  |  | 84,390,000 |  |
Convertible Senior Unsecured Notes |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Notes exchanged/converted |  |  |  |  | $ 232,100 |  |
Convertible Senior Unsecured Notes | Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock issued for debt exchange (in shares) |  |  | 0 |  | 84,400,000 |  |
Plan of Reorganization | 8.5% Convertible perpetual preferred stock | Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage | 8.50% |  |  |  |  |  |
Plan of Reorganization | 7.0% Convertible perpetual preferred stock | Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage | 7.00% |  |  |  |  |  |
Plan of Reorganization | New Common Stock | Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
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 |  |  |  |  |  |
Plan of Reorganization | Series B Warrants | Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued | 2,100,000 |  |  |  |  |  |
Plan of Reorganization | Series A Warrants | Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued | 4,900,000 |  |  |  |  |  |
Holders of Unsecured Claims | Plan of Reorganization | New Common Stock | Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued | 5,200,000 |  |  |  |  |  |
Holders of Unsecured Claims | Plan of Reorganization | Series B Warrants | Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued | 2,100,000 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 42.03 |  |  |  |  |  |
Holders of Unsecured Claims | Plan of Reorganization | Series A Warrants | Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued | 4,900,000 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 41.34 |  |  |  |  |  |
New Convertible Debt | Convertible Senior Unsecured Notes | Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock issued for debt exchange (in shares) |  | 200,000 |  |  |  |  |
New Convertible Debt | Plan of Reorganization | Convertible Senior Unsecured Notes | New Common Stock | Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock issued for debt exchange (in shares) |  | 200,000 |  |  |  |  |

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