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Debt - Pre-Emergence Indebtedness (Details) - USD ($)
shares in Millions
1 Months Ended 3 Months Ended 9 Months Ended
May 11, 2016
Jun. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Apr. 20, 2016
Mar. 11, 2016
Mar. 10, 2016
Dec. 31, 2015
Oct. 31, 2015
Debt Instrument                      
Debt issued     $ 0   $ 0         $ 3,562,378,000  
Common stock issued for debt exchange (in shares)         84.4            
Aggregate cash payments for early conversion         $ 33,500,000            
Gain (loss) on extinguishment of debt     $ 0 $ 340,699,000 41,179,000 $ 358,633,000          
Write off of debt issuance costs         0 7,108,000          
Conversion Of Senior Notes To Common Stock                      
Debt Instrument                      
Gain (loss) on extinguishment of debt         41,300,000            
Write off of debt issuance costs         $ 4,300,000            
8.125% Convertible Senior Notes due 2022                      
Debt Instrument                      
Long-term debt, fixed interest rate     8.125%   8.125%            
7.5% Convertible Senior Notes due 2023                      
Debt Instrument                      
Long-term debt, fixed interest rate     7.50%   7.50%            
Senior credit facility                      
Debt Instrument                      
Ratio of secured debt to EBITDA     2.00   2.00            
Minimum current ratio     1.0   1.0            
Number of days prior to earliest maturity date or mandatory offer of repurchase         91 days            
Allowed repurchases of outstanding debt     $ 275,000,000   $ 275,000,000            
Percentage of proved reserves pledged as collateral     80.00%   80.00%            
Borrowing base             $ 500,000,000 $ 340,000,000 $ 500,000,000    
Carrying value     $ 449,200,000   $ 449,200,000            
Outstanding letters of credit     9,900,000   $ 9,900,000            
Senior credit facility | Plan of Reorganization                      
Debt Instrument                      
Repayments of debt $ 40,000,000                    
Senior credit facility | Maximum                      
Debt Instrument                      
Unused capacity, commitment fee percentage         0.50%            
Senior credit facility | LIBOR | Minimum                      
Debt Instrument                      
Basis spread on variable rate         1.75%            
Senior credit facility | LIBOR | Maximum                      
Debt Instrument                      
Basis spread on variable rate         2.75%            
Senior credit facility | Federal Funds Rate                      
Debt Instrument                      
Basis spread on variable rate         0.50%            
Senior credit facility | One-Month Eurodollar Rate                      
Debt Instrument                      
Basis spread on variable rate         1.00%            
Senior credit facility | Base Rate | Minimum                      
Debt Instrument                      
Basis spread on variable rate         0.75%            
Senior credit facility | Base Rate | Maximum                      
Debt Instrument                      
Basis spread on variable rate         1.75%            
Senior Secured Notes | 8.75% Senior Secured Notes                      
Debt Instrument                      
Carrying value     1,328,000,000   $ 1,328,000,000         $ 1,265,814,000  
Debt issued     $ 1,300,000,000   $ 1,300,000,000            
Face amount of debt instrument       $ 1,250,000,000.0   $ 1,250,000,000.0         $ 78,000,000.0
Proceeds from issuance of debt, net of issuance costs   $ 1,210,000,000                  
Fair value of debt                     $ 50,300,000
Long-term debt, fixed interest rate     8.75%   8.75%            
Senior Unsecured Notes | 8.75% Senior Secured Notes                      
Debt Instrument                      
Long-term debt, fixed interest rate     8.75%   8.75%         8.75%  
Senior Unsecured Notes | 8.75% Senior Notes due 2020                      
Debt Instrument                      
Carrying value     $ 395,935,000   $ 395,935,000         $ 389,232,000  
Long-term debt, fixed interest rate     8.75%   8.75%         8.75%  
Aggregate outstanding principal amount     $ 100,000,000   $ 100,000,000            
Senior Unsecured Notes | 8.125% Convertible Senior Notes due 2022                      
Debt Instrument                      
Long-term debt, fixed interest rate     8.125%   8.125%         8.125%  
Senior Unsecured Notes | 7.5% Convertible Senior Notes due 2023                      
Debt Instrument                      
Long-term debt, fixed interest rate     7.50%   7.50%         7.50%  
Convertible Senior Unsecured Notes                      
Debt Instrument                      
Notes exchanged/converted         $ 232,100,000            
Convertible Senior Unsecured Notes | 8.125% Convertible Senior Notes due 2022                      
Debt Instrument                      
Carrying value     $ 40,694,000   $ 40,694,000         $ 78,290,000  
Long-term debt, fixed interest rate     8.125% 8.125% 8.125% 8.125%          
Notes exchanged/converted     $ 0   $ 200,500,000            
Aggregate principal amount of convertible debt net of discount and including holders' conversion feature exercised         67,400,000            
Convertible Senior Unsecured Notes | 7.5% Convertible Senior Notes due 2023                      
Debt Instrument                      
Carrying value     $ 46,900,000   $ 46,900,000         $ 24,393,000  
Long-term debt, fixed interest rate     7.50% 7.50% 7.50% 7.50%          
Notes exchanged/converted         $ 31,600,000            
Aggregate principal amount of convertible debt net of discount and including holders' conversion feature exercised         $ 10,400,000