Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation - Additional Information (Details)

v3.3.0.814
Basis of Presentation - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
$ / bbl
$ / MMBTU
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Oct. 30, 2015
USD ($)
Oct. 01, 2015
$ / bbl
$ / MMBTU
May. 31, 2015
USD ($)
Basis Of Presentation [Line Items]                
Net cash provided by operating activities     $ 134,793 $ 419,778        
Net cash used in investing activities     $ (259,459) (452,482)        
Percentage of discount from proved reserves     10.00%          
Ceiling test write-down of oil and natural gas properties $ 441,688 $ 0 $ 954,850 0 $ 0      
Addition to available cash $ 100,000   $ 100,000          
Second Lien Term Loan                
Basis Of Presentation [Line Items]                
Term loan               $ 300,000
Debt instrument maturity date     May 15, 2020          
Debt instrument interest rate               9.00%
Subsequent Event | Credit Agreement                
Basis Of Presentation [Line Items]                
Revolving bank credit facility borrowing base           $ 350,000    
SEC Methodology | Crude Oil                
Basis Of Presentation [Line Items]                
Weighted price | $ / bbl     55.73          
SEC Methodology | Natural Gas                
Basis Of Presentation [Line Items]                
Weighted price | $ / MMBTU     3.06          
Industry Quoted Spot Prices | Crude Oil | Subsequent Event                
Basis Of Presentation [Line Items]                
Average Spot Price | $ / bbl             41.25  
Henry Hub Spot Prices | Natural Gas | Subsequent Event                
Basis Of Presentation [Line Items]                
Average Spot Price | $ / MMBTU             2.48  
Reclassifications                
Basis Of Presentation [Line Items]                
Net cash provided by operating activities       5,200        
Net cash used in investing activities       $ 5,200