Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies - Additional Information (Details)

v3.10.0.1
Significant Accounting Policies - Additional Information (Details)
 1 Months Ended 3 Months Ended 12 Months Ended 25 Months Ended
Oct. 18, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Platform
Dec. 31, 2016
USD ($)
Oct. 18, 2018
USD ($)
Oct. 17, 2018
USD ($)
Significant Accounting Policies [Line Items]                  
Natural gas imbalances   $ 4,100,000 $ 4,100,000   $ 4,100,000 $ 4,700,000      
Oil and natural gas properties and equipment - full cost method, amount excluded from amortization   0 0   $ 0 0      
Percentage of discount from proved reserves         10.00%        
Ceiling test write-down of oil and natural gas properties         $ 0 0 $ 279,063,000    
Proved undeveloped reserves classification period to be drilled         5 years        
Gain on exchange of debt     $ 47,100,000 $ 7,800,000 $ 47,109,000 $ 7,811,000 123,923,000    
Number of platforms damaged | Platform           1      
Reimbursements from a third-party for damages           $ 1,100,000      
ASU 2016-02                  
Significant Accounting Policies [Line Items]                  
Effect of adoption in asset and liabilities   $ 5,000,000              
Apache Corporation                  
Significant Accounting Policies [Line Items]                  
Expense related to lawsuit           $ 6,300,000      
Exchange Transaction                  
Significant Accounting Policies [Line Items]                  
Gain on exchange of debt             $ 123,900,000    
Fixtures and Non-Oil and Natural Gas Property and Equipment | Minimum                  
Significant Accounting Policies [Line Items]                  
Estimated useful lives         5 years        
Fixtures and Non-Oil and Natural Gas Property and Equipment | Maximum                  
Significant Accounting Policies [Line Items]                  
Estimated useful lives         7 years        
9.75% Senior Second Lien Notes, Due November 2023                  
Significant Accounting Policies [Line Items]                  
Debt instrument maturity date Nov. 01, 2023       Nov. 01, 2023 Nov. 01, 2023      
Revolving Bank Credit Facility Due October 2022                  
Significant Accounting Policies [Line Items]                  
Credit agreement expiration date Oct. 18, 2022                
Credit Facility, Due October 2022                  
Significant Accounting Policies [Line Items]                  
Debt instrument maturity date         Oct. 18, 2022        
Credit agreement expiration date Oct. 18, 2022                
Credit facility borrowing base $ 250,000,000             $ 250,000,000 $ 150,000,000
1.5 Lien Term Loan | Exchange Transaction                  
Significant Accounting Policies [Line Items]                  
Interest expense recorded for new debt               $ 0