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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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