Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation - Additional Information (Details)

v3.10.0.1
Basis of Presentation - Additional Information (Details) - USD ($)
Oct. 18, 2018
Sep. 30, 2018
Dec. 31, 2017
Basis Of Presentation [Line Items]      
Debt instrument principal amount   $ 903,194,000 $ 889,790,000
Oil and natural gas properties and equipment - full cost method, amount excluded from amortization   0 $ 0
9.75% Senior Second Lien Notes, Due November 2023 | Subsequent Event      
Basis Of Presentation [Line Items]      
Debt instrument principal amount $ 625,000,000    
Debt instrument interest rate 9.75%    
Debt instrument maturity date Nov. 01, 2023    
Revolving Bank Credit Facility Due October 2022      
Basis Of Presentation [Line Items]      
Revolving bank credit facility borrowing base   $ 150,000,000  
Revolving Bank Credit Facility Due October 2022 | Subsequent Event      
Basis Of Presentation [Line Items]      
Credit agreement expiration date Oct. 18, 2022    
Revolving bank credit facility borrowing base $ 250,000,000    
Revolving Bank Credit Facility Due October 2022 | Letters of Credit | Subsequent Event      
Basis Of Presentation [Line Items]      
Revolving bank credit facility maximum lender commitment $ 30,000,000