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FRESH-START ACCOUNTING-Successor equity (Details) - $ / shares shares in Millions	Apr. 06, 2017	Sep. 09, 2016
Warrants Issued to Former Holders of Unsecured and Convertible Notes
Stockholders' equity
Number of warrants issued		4.7
Exercise price (in dollars per share)		$ 14.04
Exercise or expiration period		4 years
8.0% convertible note due 2017
Stockholders' equity
Number of warrants issued		0.9
Senior Unsecured Notes Held by Certain Holders
Stockholders' equity
Number of warrants issued		3.8
Common Stock
Stockholders' equity
Shares issued	55.2	90.0
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 | 13.0% senior secured third lien notes due 2022
Stockholders' equity
Shares issued		68.8
Reorganization Adjustments | 8.0% convertible note due 2017
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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
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