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Equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 4 Months Ended
Feb. 10, 2017
Oct. 04, 2016
Feb. 09, 2017
Dec. 31, 2016
Mar. 31, 2016
Feb. 09, 2017
Mar. 31, 2017
Class of Stock [Line Items]              
Common stock, shares issued       21,042,000     35,855,000
Common stock, par value (in dollars per share)       $ 0.001     $ 0.001
8.5% Convertible perpetual preferred stock              
Class of Stock [Line Items]              
Preferred stock, dividend rate, percentage         8.50%    
Successor | New Common Stock              
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          
Successor | Series A Warrants              
Class of Stock [Line Items]              
Number of shares to be issued   4,900,000          
Shares issued   4,500,000          
Number of common shares exercised for each warrant   1          
Successor | Series B Warrants              
Class of Stock [Line Items]              
Number of shares to be issued   2,100,000          
Shares issued   1,900,000          
Number of common shares exercised for each warrant   1          
Successor | Holders of Unsecured Claims | Series A Warrants              
Class of Stock [Line Items]              
Exercise price (in usd per share)   $ 41.34          
Successor | Holders of Unsecured Claims | Series B Warrants              
Class of Stock [Line Items]              
Exercise price (in usd per share)   $ 42.03          
Successor | Convertible Notes | Convertible Senior Unsecured Notes              
Class of Stock [Line Items]              
Common stock issued for debt exchange (in shares) 14,100,000   300,000 700,000   1,000,000  
Predecessor | 8.5% Convertible perpetual preferred stock              
Class of Stock [Line Items]              
Preferred stock, dividend rate, percentage         8.50%    
Preferred dividends in arrears         $ 11.3    
Predecessor | 7.0% Convertible perpetual preferred stock              
Class of Stock [Line Items]              
Preferred stock, dividend rate, percentage         7.00%    
Preferred dividends in arrears         $ 10.5