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FRESH-START ACCOUNTING-Successor equity (Details) - $ / shares shares in Millions | Feb. 09, 2018 | Apr. 06, 2017 | Sep. 09, 2016
--- | --- | --- | ---
Stockholders' equity |  |  |
Shares issued | 9.2 | 55.2 | 90.0
Equivalent number shares of the warrants |  |  | 4.7
Exercise price (in dollars per share) |  |  | $ 14.04
Warrants Issued to Former Holders of Unsecured and Convertible Notes |  |  |
Stockholders' equity |  |  |
Exercise price (in dollars per share) |  |  | $ 14.04
Exercise or expiration period |  |  | 4 years
Reorganization Adjustments | Warrants Issued to Former Holders of Unsecured and Convertible Notes |  |  |
Stockholders' equity |  |  |
Fair Value price of Warrants (in dollars per share) |  |  | $ 3.52
Reorganization Adjustments | 8.0% convertible note due 2020 |  |  |
Stockholders' equity |  |  |
Shares issued |  |  | 3.6
Reorganization Adjustments | Senior Unsecured Notes Held by Certain Holders |  |  |
Stockholders' equity |  |  |
Shares issued |  |  | 14.0
Reorganization Adjustments | Common Stock |  |  |
Stockholders' equity |  |  |
Shares issued |  |  | 3.6
Reorganization Adjustments | Common Stock | 13.0% senior secured third lien notes due 2022 |  |  |
Stockholders' equity |  |  |
Shares issued |  |  | 68.8

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