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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