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Debt - Narrative (Details)
1 Months Ended 2 Months Ended 10 Months Ended 12 Months Ended
Jul. 31, 2017
USD ($)
Feb. 28, 2018
USD ($)
Feb. 28, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2016
USD ($)
Nov. 30, 2018
USD ($)
Oct. 31, 2018
USD ($)
Debt Instrument [Line Items]                
Debt Issuance Costs, Net       $ 0 $ 8,214,000      
Amortization of debt issuance costs       1,988,000 5,430,000      
Mortgage held on present value of proven oil and gas reserves (percent) 85.00%              
Net proceeds from issuance of debt       0 400,000,000      
RBL Facility                
Debt Instrument [Line Items]                
Debt issuance costs for the RBL Facility       20,000,000 16,000,000      
Medium-term notes | 2026 Notes                
Debt Instrument [Line Items]                
Fair value of debt         $ 368,000,000      
Interest Rate         7.00%      
Unsecured debt | 2026 Notes                
Debt Instrument [Line Items]                
Principal amount of debt issued   $ 400,000,000            
Interest Rate   7.00%            
Net proceeds from issuance of debt   $ 391,000,000            
Aggregate principal amount able to be redeemed (percent)   35.00%            
Redemption price in event of change in control   101.00%            
Predecessor                
Debt Instrument [Line Items]                
Amortization of debt issuance costs     $ 416,000     $ 1,849,000    
Net proceeds from issuance of debt     0     0    
Line of credit | RBL Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 1,500,000,000.0              
Borrowing base             $ 850,000,000 $ 400,000,000
Initial borrowing commitment               $ 400,000,000
Commitment fee (percent) 0.50%              
Leverage ratio (no more than)         4.0      
Current ratio (at least)         1.00      
Leverage ratio at period end         1.63      
Current ratio at period end         3.73      
Reduction to borrowing base if unsecured indebtedness is incurred (percent)         25.00%      
Available borrowing capacity         $ 393,000,000      
Letters of credit outstanding       21,000,000 7,000,000      
Letters of credit | RBL Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 25,000,000              
LIBOR | Minimum | Line of credit | RBL Facility                
Debt Instrument [Line Items]                
Applicable margin (percent) 2.50%              
LIBOR | Maximum | Line of credit | RBL Facility                
Debt Instrument [Line Items]                
Applicable margin (percent) 3.50%              
Customary base rate | Minimum | Line of credit | RBL Facility                
Debt Instrument [Line Items]                
Applicable margin (percent) 1.50%              
Customary base rate | Maximum | Line of credit | RBL Facility                
Debt Instrument [Line Items]                
Applicable margin (percent) 2.50%              
On or after February 15, 2021 | Unsecured debt | 2026 Notes                
Debt Instrument [Line Items]                
Redemption price (percent)   107.00%            
Prior to February 15, 2021 | Unsecured debt | 2026 Notes                
Debt Instrument [Line Items]                
Redemption price (percent)   100.00%            
Interest expense                
Debt Instrument [Line Items]                
Amortization of debt issuance costs     $ 0 $ 2,000,000 $ 4,000,000 $ 2,000,000