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Long-Term Debt - Narrative (Details)
$ / shares in Units, shares in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Jun. 10, 2015
USD ($)
Oct. 31, 2015
USD ($)
Aug. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2013
USD ($)
$ / PrincipalAmount
Jun. 30, 2015
USD ($)
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Oct. 16, 2015
USD ($)
Aug. 13, 2015
USD ($)
Jun. 09, 2015
USD ($)
Debt Instrument [Line Items]                        
Write off of debt issuance costs             $ 7,108,000 $ 0 $ 0      
Reduction in borrowing base for every $1 of junior lien debt incurred $ 0.25                      
Senior credit facility outstanding amount             $ 0 0        
Common stock issued for debt (in shares) | shares             92.8          
Aggregate Principle of Notes Converted             $ 63,299,000 0 0      
Gain (loss) on extinguishment of debt             641,131,000 $ 0 $ (82,005,000)      
Aggregate cash payments for accrued interest and early conversion of debt             30,500,000          
Long term debt maturing in 2020             1,700,000,000          
Conversion of Senior Notes to Common Stock                        
Debt Instrument [Line Items]                        
Write off of debt issuance costs             5,200,000          
Gain (loss) on extinguishment of debt           $ 17,900,000 $ 6,100,000          
Repurchase of Senior Notes                        
Debt Instrument [Line Items]                        
Write off of debt issuance costs   $ 1,200,000 $ 3,200,000                  
Gain (loss) on extinguishment of debt   68,700,000 152,000,000   $ (82,000,000)              
Conversion of Senior Notes to Convertible Debt                        
Debt Instrument [Line Items]                        
Write off of debt issuance costs   4,000,000 4,000,000                  
Gain (loss) on extinguishment of debt   $ 207,400,000 $ 189,000,000                  
8.125% Convertible Senior Notes due 2022                        
Debt Instrument [Line Items]                        
Long-term debt, fixed interest rate             8.125%          
7.5% Convertible Senior Notes due 2023                        
Debt Instrument [Line Items]                        
Long-term debt, fixed interest rate             7.50%          
Senior credit facility                        
Debt Instrument [Line Items]                        
Covenant, Ratio of secured debt to EBITDA, maximum                       2.25
Covenant, Ratio of EBITDA to interest expense at Mar 2015                       2.00
Covenant, Ratio of EBITDA to interest expense at Jun 2015                       2.00
Covenant, Ratio of EBITDA to interest expense at Sep 2015                       1.75
Covenant, Ratio of EBITDA to interest expense at Dec 2015                       1.50
Covenant, Ratio of EBITDA to interest expense at Mar 2016                       1.50
Covenant, Ratio of EBITDA to interest expense at Jun 2016                       1.50
Covenant, Ratio of EBITDA to interest expense at Sep 2016                       1.50
Covenant, Ratio of EBITDA to interest expense at Dec 2016                       2.00
Current assets to current liabilities, ratio minimum                       1.00
Covenant, Ratio of total net debt to EBITDA at Jun 2016                       6.25
Covenant, Ratio of total net debt to EBITDA at Sep 2016                       6.00
Covenant, Ratio of total net debt to EBITDA at Dec 2016                       6.00
Covenant, Ratio of total net debt to EBITDA at Mar 2017                       5.50
Covenant, Ratio of total net debt to EBITDA at Jun 2017                       5.50
Covenant, Ratio of total net debt to EBITDA at Sep 2017                       5.00
Covenant, Ratio of total net debt to EBITDA at Dec 2017                       5.00
Covenant, Ratio of total net debt to EBITDA at Mar 2018                       4.50
Line of credit facility, current borrowing capacity                       $ 900,000,000
Line of credit facility, letters of credit outstanding             $ 11,000,000          
Senior credit facility | August 2015 Amendment                        
Debt Instrument [Line Items]                        
Allowed repurchases of outstanding debt                   $ 275,000,000 $ 200,000,000.0  
Senior credit facility | June Amendment                        
Debt Instrument [Line Items]                        
Covenant, Ratio of secured debt to EBITDA, maximum             2.00          
Current assets to current liabilities, ratio minimum             1.0          
Line of credit facility, minimum collateral amount of proved oil and gas reserves representing the discounted present value of reserves used in borrowing base determination 80.00%                      
Line of credit facility maximum borrowings capacity $ 1,000,000,000.0                      
Line of credit facility, current borrowing capacity             $ 500,000,000          
Write off of debt issuance costs 4,900,000                      
Additional aggregate principal indebtedness permitted (less than) $ 1,750,000,000.00                      
Senior credit facility | June Amendment | Maximum                        
Debt Instrument [Line Items]                        
Line of credit facility, unused capacity, commitment fee percentage 0.50%                      
Senior credit facility | June Amendment | London Interbank Offered Rate (LIBOR) | Minimum                        
Debt Instrument [Line Items]                        
Line of credit facility, basis spread on variable rate 1.75%                      
Senior credit facility | June Amendment | London Interbank Offered Rate (LIBOR) | Maximum                        
Debt Instrument [Line Items]                        
Line of credit facility, basis spread on variable rate 2.75%                      
Senior credit facility | June Amendment | Federal Funds                        
Debt Instrument [Line Items]                        
Line of credit facility, basis spread on variable rate 0.50%                      
Senior credit facility | June Amendment | One-Month Eurodollar Rate                        
Debt Instrument [Line Items]                        
Line of credit facility, basis spread on variable rate 1.00%                      
Senior credit facility | June Amendment | Base Rate | Minimum                        
Debt Instrument [Line Items]                        
Line of credit facility, basis spread on variable rate 0.75%                      
Senior credit facility | June Amendment | Base Rate | Maximum                        
Debt Instrument [Line Items]                        
Line of credit facility, basis spread on variable rate 1.75%                      
Junior Subordinated Debt | June Amendment                        
Debt Instrument [Line Items]                        
Outstanding junior debt threshold, reduction of maximum borrowing base $ 1,500,000,000.00                      
Convertible Debt                        
Debt Instrument [Line Items]                        
Debt issuance costs             6,300,000          
Debt conversion, original debt, amount             $ 255,300,000          
Conversion ratio             0.3636          
Convertible debt, threshold percentage of stock price trigger             40.00%          
Initial conversion price threshold (usd per share) | $ / shares             $ 1.10          
Convertible Debt | 8.125% Convertible Senior Notes due 2022                        
Debt Instrument [Line Items]                        
Long-term debt, fixed interest rate   8.125% 8.125%       8.125% 8.125%        
Embedded derivative, fair value             $ 21,874,000          
Long term debt, discount             180,751,000          
Aggregate Principle of Notes Converted   $ 269,400,000 $ 158,400,000                  
Debt conversion, original debt, amount             186,600,000          
Debt conversion, original debt aggregate principal, net of discount and including holder's conversion feature             $ 54,400,000          
Convertible Debt | 7.5% Convertible Senior Notes due 2023                        
Debt Instrument [Line Items]                        
Long-term debt, fixed interest rate   7.50% 7.50%       7.50% 7.50%        
Embedded derivative, fair value             $ 7,481,000          
Long term debt, discount             59,549,000          
Aggregate Principle of Notes Converted     $ 116,600,000                  
Debt conversion, original debt, amount             68,700,000          
Debt conversion, original debt aggregate principal, net of discount and including holder's conversion feature             19,300,000          
Secured Debt | 8.75% Senior Secured Notes Due 2020                        
Debt Instrument [Line Items]                        
Debt instrument, face amount   $ 78,000,000.0   $ 1,250,000,000.0   $ 1,250,000,000.0 $ 1,300,000,000          
Long-term debt, fixed interest rate       8.75%   8.75% 8.75%          
Proceeds from debt, net of issuance costs       $ 1,210,000,000                
Fair value of Notes awarded   50,300,000                    
Embedded derivative, fair value   2,800,000         $ 2,941,000          
Long term debt, discount   30,500,000         29,842,000          
Debt issuance costs             39,200,000          
Senior Notes                        
Debt Instrument [Line Items]                        
Debt issuance costs             $ 48,900,000          
Debt instrument, repurchased face amount   100,000,000 250,000,000                  
Repurchase of unsecured notes   30,000,000 94,500,000                  
Debt conversion, original debt, amount   $ 300,000,000 $ 275,000,000                  
Senior Notes | 8.75% Senior Notes due 2020                        
Debt Instrument [Line Items]                        
Long-term debt, fixed interest rate   8.75% 8.75%       8.75% 8.75%        
Long term debt, discount             $ 3,269,000 $ 4,598,000        
Mandatory prepayment feature, threshold amount of outstanding principal amount of senior notes             $ 100,000,000          
Debt instrument, repurchased face amount   $ 2,200,000 $ 29,300,000                  
Debt conversion, original debt, amount   $ 6,600,000 $ 15,900,000                  
Senior Notes | 7.5% Senior Notes due 2021                        
Debt Instrument [Line Items]                        
Long-term debt, fixed interest rate   7.50% 7.50%       7.50% 7.50%        
Aggregate Principle of Notes Converted           $ 29,000,000            
Debt instrument, repurchased face amount   $ 46,600,000 $ 111,600,000                  
Debt conversion, original debt, amount   $ 189,300,000 $ 40,700,000                  
Senior Notes | 8.125% Senior Notes due 2022                        
Debt Instrument [Line Items]                        
Long-term debt, fixed interest rate   8.125% 8.125%       8.125% 8.125%        
Aggregate Principle of Notes Converted           $ 21,000,000            
Debt instrument, repurchased face amount     $ 26,100,000                  
Debt conversion, original debt, amount   $ 73,500,000 $ 101,800,000                  
Senior Notes | 7.5% Senior Notes due 2023                        
Debt Instrument [Line Items]                        
Long-term debt, fixed interest rate   7.50% 7.50%       7.50% 7.50%        
Long term debt, discount             $ 1,989,000 $ 3,452,000        
Debt instrument, repurchased face amount   $ 51,200,000 $ 83,000,000                  
Debt conversion, original debt, amount   $ 30,600,000 $ 116,600,000                  
Senior Notes | 7.5% Senior Notes Due 2021 And 8.125% Senior Notes Due 2022                        
Debt Instrument [Line Items]                        
Common stock issued for debt (in shares) | shares           28.0            
Aggregate Principle of Notes Converted           $ 50,000,000            
Debt conversion, original debt, amount             $ 50,000,000          
Senior Notes | 9.875% Senior Notes Due 2016                        
Debt Instrument [Line Items]                        
Long-term debt, fixed interest rate         9.875%              
Debt tender offer, aggregate principal amount         $ 365,500,000              
Debt instrument redemption price per principal amount (usd per principal amount) | $ / PrincipalAmount         1,061.34              
Senior Notes | 8.0% Senior Notes Due 2018                        
Debt Instrument [Line Items]                        
Long-term debt, fixed interest rate         8.00%              
Debt tender offer, aggregate principal amount         $ 750,000,000              
Debt instrument redemption price per principal amount (usd per principal amount) | $ / PrincipalAmount         1,052.77