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Long-Term Debt Long-Term Debt - Additional Information (Details)
 3 Months Ended 6 Months Ended 12 Months Ended 24 Months Ended
Apr. 13, 2015
USD ($)
Jun. 30, 2015
USD ($)
financial_institution
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
financial_institution
Jun. 30, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Apr. 12, 2015
USD ($)
Dec. 31, 2014
Debt Instrument [Line Items]                  
Number of Financial Institutions | financial_institution   18   18          
Deferred financing costs   $ 35,100,000   $ 35,100,000          
Amortization of deferred financing costs   2,400,000 $ 1,600,000 $ 4,000,000 $ 3,200,000        
Senior Unsecured Debt [Member]                  
Debt Instrument [Line Items]                  
Net proceeds from issuance of notes             $ 1,175,800,000    
Redemption percentage, maximum       35.00%          
Redemption term       180 days          
Percentage of minimum outstanding principal amount       65.00%          
Debt Instrument, Default in Payment of Interest, Term       30 days          
Event of default by payment default ($10.0 million or more)       $ 10,000,000.0          
Event of default by final judgments (in excess of $10.0 million)       $ 10,000,000.0          
Event of default by final judgments, payment term       60 days          
Second Amended Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Extension of maturity date condition, retirement or refinancing of notes, term 90 days                
Line of credit facility maximum increase to aggregate commitments $ 1,700,000,000             $ 2,000,000,000  
Line of credit facility, maximum borrowing capacity $ 1,525,000,000             $ 1,500,000,000  
Line of credit facility, capacity available for specific purpose other than for trade purchases   $ 2,500,000,000   $ 2,500,000,000          
Commitment fee of borrowing base capacity not utilized   0.375%              
Minimum current ratio       1.0          
Line of credit facility, amount outstanding   $ 155,000,000   $ 155,000,000          
Outstanding letters of credit   5,200,000   5,200,000          
Line of credit facility, remaining borrowing capacity   $ 1,364,800,000   $ 1,364,800,000          
Weighted average interest rate   1.70%   1.70%         1.90%
Minimum [Member] | Second Amended Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Percentage of the reserve value of assets as determined by reserve reports (at least 80%)       80.00%          
Ratio of EBITDAX to interest expense necessary to maintain covenants       2.5          
2022 Notes [Member] | Senior Unsecured Debt [Member]                  
Debt Instrument [Line Items]                  
Principal debt amount           $ 1,000,000,000.0      
Stated interest rate           6.875%      
Net proceeds from issuance of notes           $ 983,600,000      
2019 Notes [Member] | Senior Unsecured Debt [Member]                  
Debt Instrument [Line Items]                  
Principal debt amount             $ 400,000,000.0    
Stated interest rate             7.25%    
2021 Notes [Member] | Senior Unsecured Debt [Member]                  
Debt Instrument [Line Items]                  
Principal debt amount             $ 400,000,000.0    
Stated interest rate             6.50%    
2023 Notes [Member] | Senior Unsecured Debt [Member]                  
Debt Instrument [Line Items]                  
Principal debt amount             $ 400,000,000.0    
Stated interest rate             6.875%