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Debt - Narrative (Details) - USD ($)
shares in Millions
1 Months Ended 3 Months Ended 6 Months Ended
May 11, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Mar. 21, 2016
Mar. 11, 2016
Dec. 31, 2015
Oct. 31, 2015
Aug. 31, 2015
Debt Instrument                      
Unamortized debt issuance costs and associated discounts and premiums written-off         $ 158,600,000            
Debt holder conversion feature and mandatory prepayment feature - PGC Senior Secured Notes     $ 9,777,000   $ 9,777,000            
Unamortized discount (premium) and debt issuance costs, net                 $ 342,600,000    
Fair value of debt derivative                 32,300,000    
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     $ (152,000) $ 17,934,000 41,179,000 $ 17,934,000          
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                      
Debt reclassified to liabilities subject to compromise     $ 448,900,000   $ 448,900,000            
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            
Minimum collateral amount of proved oil, natural gas and NGL reserves representing the discounted present value of reserves used in borrowing base determination     80.00%   80.00%            
Borrowing base               $ 340,000,000      
Carrying value     $ 448,900,000   $ 448,900,000            
Outstanding letters of credit     10,200,000   $ 10,200,000            
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                      
Debt Instrument                      
Debt reclassified to liabilities subject to compromise     1,300,000,000   $ 1,300,000,000            
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, face amount   $ 1,250,000,000.0 $ 1,300,000,000 $ 1,250,000,000.0 $ 1,300,000,000 $ 1,250,000,000.0       $ 78,000,000  
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 Notes                      
Debt Instrument                      
Debt reclassified to liabilities subject to compromise     $ 2,200,000,000   $ 2,200,000,000            
Senior Notes | 8.75% Senior Secured Notes                      
Debt Instrument                      
Long-term debt, fixed interest rate     8.75%   8.75%       8.75%    
Senior 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 Notes | 8.125% Convertible Senior Notes due 2022                      
Debt Instrument                      
Long-term debt, fixed interest rate     8.125%   8.125%       8.125%    
Senior 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                      
Debt reclassified to liabilities subject to compromise     $ 87,600,000   $ 87,600,000            
Conversion rate         0.3636            
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%
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%
Notes exchanged/converted         31,600,000            
Aggregate principal amount of convertible debt net of discount and including holders' conversion feature exercised         $ 10,400,000            
Restructuring Support Agreement | Senior credit facility                      
Debt Instrument                      
Repayments of debt $ 40,000,000                    
June Amendment | Senior credit facility                      
Debt Instrument                      
Borrowing base             $ 500,000,000