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Subsequent Events - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Nov. 04, 2015
USD ($)
shares
Nov. 03, 2015
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a
well
Oct. 31, 2015
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mi
shares
Aug. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
shares
Jun. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2014
USD ($)
Dec. 31, 2014
shares
Subsequent Event                  
Aggregate principal amount of convertible senior notes issued in debt exchange             $ 35,147,000 $ 0  
Common stock issued for debt exchange (in shares) | shares         8,000,000        
Aggregate cash payments for early conversion         $ 2,700,000        
Subsequent Event                  
Subsequent Event                  
Common stock issued for debt exchange (in shares) | shares 37,900,000                
Aggregate cash payments for early conversion $ 12,900,000                
PGC | Subsequent Event                  
Subsequent Event                  
Acquisition, cash consideration     $ 48,000,000            
Acquisition, liability incurred     $ 78,000,000            
Number of miles of gathering lines acquired | mi     370            
Senior Notes                  
Subsequent Event                  
Aggregate principal amount of debt repurchased       $ 250,000,000          
Cash paid to repurchase debt       94,500,000          
Notes exchanged/converted       275,000,000          
Senior Notes | Subsequent Event                  
Subsequent Event                  
Aggregate principal amount of debt repurchased     $ 100,000,000            
Cash paid to repurchase debt     (30,000,000)            
Notes exchanged/converted     300,000,000            
Convertible Senior Unsecured Notes                  
Subsequent Event                  
Notes exchanged/converted         21,900,000        
8.75% Senior Notes due 2020 | Senior Notes                  
Subsequent Event                  
Aggregate principal amount of debt repurchased       29,300,000          
Notes exchanged/converted       15,900,000          
8.75% Senior Notes due 2020 | Senior Notes | Subsequent Event                  
Subsequent Event                  
Aggregate principal amount of debt repurchased     2,200,000            
Notes exchanged/converted     6,600,000            
7.5% Senior Notes due 2021 | Senior Notes                  
Subsequent Event                  
Aggregate principal amount of debt repurchased       111,600,000          
Notes exchanged/converted       40,700,000          
Aggregate principal amount of convertible senior notes issued in debt exchange           $ 29,000,000      
7.5% Senior Notes due 2021 | Senior Notes | Subsequent Event                  
Subsequent Event                  
Aggregate principal amount of debt repurchased     46,600,000            
Notes exchanged/converted     189,300,000            
8.125% Senior Notes due 2022 | Senior Notes                  
Subsequent Event                  
Aggregate principal amount of debt repurchased       26,100,000          
Notes exchanged/converted       101,800,000          
Aggregate principal amount of convertible senior notes issued in debt exchange           $ 21,000,000      
8.125% Senior Notes due 2022 | Senior Notes | Subsequent Event                  
Subsequent Event                  
Notes exchanged/converted     73,500,000            
7.5% Senior Notes due 2023 | Senior Notes                  
Subsequent Event                  
Aggregate principal amount of debt repurchased       83,000,000          
Notes exchanged/converted       116,600,000          
7.5% Senior Notes due 2023 | Senior Notes | Subsequent Event                  
Subsequent Event                  
Aggregate principal amount of debt repurchased     51,200,000            
Notes exchanged/converted     30,600,000            
8.125% Convertible Senior Notes due 2022 | Convertible Senior Unsecured Notes                  
Subsequent Event                  
Notes exchanged/converted         19,400,000        
Aggregate principal amount of convertible senior notes issued in debt exchange       158,400,000          
8.125% Convertible Senior Notes due 2022 | Convertible Senior Unsecured Notes | Subsequent Event                  
Subsequent Event                  
Notes exchanged/converted 97,200,000                
Aggregate principal amount of convertible senior notes issued in debt exchange     269,400,000            
7.5% Convertible Senior Notes due 2023 | Convertible Senior Unsecured Notes                  
Subsequent Event                  
Notes exchanged/converted         $ 2,500,000        
Aggregate principal amount of convertible senior notes issued in debt exchange       $ 116,600,000          
7.5% Convertible Senior Notes due 2023 | Convertible Senior Unsecured Notes | Subsequent Event                  
Subsequent Event                  
Notes exchanged/converted $ 6,900,000                
Aggregate principal amount of convertible senior notes issued in debt exchange     $ 30,600,000            
7.0% Convertible perpetual preferred stock                  
Subsequent Event                  
Preferred stock, shares outstanding | shares         3,000,000   3,000,000   3,000,000
7.0% Convertible perpetual preferred stock | Subsequent Event                  
Subsequent Event                  
Preferred stock, shares outstanding | shares     216,000            
Shares of common stock issued related to the conversion of preferred stock (in shares) | shares     2,800,000            
North Park Basin, Jackson County, Colorado | Acquisition Of Oil And Natural Gas Assets | Subsequent Event                  
Subsequent Event                  
Number of wells acquired | well   16              
Number of acres acquired | a   136,000              
Consideration   $ 190,000,000