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Debt - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions
1 Months Ended 3 Months Ended
Jun. 30, 2015
Mar. 31, 2016
Mar. 31, 2015
Mar. 11, 2016
Dec. 31, 2015
Oct. 31, 2015
Aug. 31, 2015
Debt Instrument              
Carrying value   $ 3,981,371,000     $ 3,562,378,000    
Fair value of debt derivative   $ 9,800,000     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   41,331,000 $ 0        
Write off of debt issuance costs   0 $ 2,221,000        
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%          
7.5% Convertible Senior Notes due 2023              
Debt Instrument              
Long-term debt, fixed interest rate   7.50%          
Senior credit facility              
Debt Instrument              
Debt Instrument, Restrictive Covenants, Ratio of Secured Debt To EBITDA, Measured Quarterly   2.00          
Current Ratio, Minimum   1.00          
Number of days prior to earliest maturity date or mandatory offer of repurchase   91 days          
Allowed repurchases of outstanding debt   $ 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%          
Maximum borrowing capacity   $ 1,000,000,000          
Borrowing base       $ 340,000,000      
Additional aggregate principal indebtedness permitted (less than)   1,750,000,000.00          
Reduction in borrowing base for every $1 junior lien debt incurred   0.25          
Carrying value   488,900,000     0    
Outstanding letters of credit   $ 10,400,000          
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%          
Junior lien debt              
Debt Instrument              
Outstanding junior debt threshold, reduction of maximum borrowing base   $ 1,500,000,000.00          
Senior Secured Notes | 8.75% Senior Secured Notes due 2020              
Debt Instrument              
Carrying value   1,267,924,000     $ 1,265,814,000    
Debt, face amount $ 1,250,000,000.0 $ 1,300,000,000       $ 78,000,000  
Proceeds from issuance of debt, net of issuance costs $ 1,210,000,000            
Fair value of debt           50,300,000  
Fair value of debt derivative           2,800,000  
Unamortized discount           $ 30,500,000  
Long-term debt, fixed interest rate   8.75%     8.75%    
Debt issuance costs   $ 39,300,000          
Senior Notes              
Debt Instrument              
Debt issuance costs   48,900,000          
Senior Notes | 8.75% Senior Notes due 2020              
Debt Instrument              
Carrying value   $ 389,645,000     $ 389,232,000    
Long-term debt, fixed interest rate   8.75%     8.75%    
Aggregate outstanding principal amount   $ 100,000,000          
Senior Notes | 8.125% Convertible Senior Notes due 2022              
Debt Instrument              
Long-term debt, fixed interest rate   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%    
Convertible Senior Unsecured Notes              
Debt Instrument              
Debt issuance costs   $ 1,900,000          
Conversion rate   0.3636          
Percentage of applicable conversion price threshold   40.00%          
Conversion price threshold (usd per share)   $ 1.10          
Notes exchanged/converted   $ 232,100,000          
Convertible Senior Unsecured Notes | 8.125% Convertible Senior Notes due 2022              
Debt Instrument              
Carrying value   $ 14,692,000     $ 78,290,000    
Long-term debt, fixed interest rate   8.125%     8.125%   8.125%
Notes exchanged/converted   $ 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   $ 14,577,000     $ 24,393,000    
Long-term debt, fixed interest rate   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