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Credit Facility (Details) - USD ($)
3 Months Ended
Oct. 31, 2018
Mar. 31, 2020
May 01, 2020
Dec. 31, 2019
Oct. 23, 2019
Oct. 22, 2019
Line Of Credit Facility [Line Items]            
Credit facility   $ 388,000,000   $ 394,000,000    
Senior Line of Credit | Revolving Credit Facility            
Line Of Credit Facility [Line Items]            
Maximum borrowing capacity   $ 1,000,000,000.0        
Borrowing base         $ 650,000,000.0 $ 675,000,000.0
Weighted average interest rate (percent)   3.22%   4.05%    
Interest payable, term   90 days        
Borrowing base threshold (percent)   50.00%        
Credit facility   $ 388,000,000.0   $ 394,000,000.0    
Unused portion of current borrowing base   $ 262,000,000.0   $ 256,000,000.0    
Senior Line of Credit | Revolving Credit Facility | Subsequent Event            
Line Of Credit Facility [Line Items]            
Borrowing base     $ 460,000,000.0      
Senior Line of Credit | Revolving Credit Facility | Federal Funds            
Line Of Credit Facility [Line Items]            
Interest rate (percent)   0.50%        
Senior Line of Credit | Revolving Credit Facility | LIBOR Plus Margin Rate            
Line Of Credit Facility [Line Items]            
Interest rate (percent)   1.00%        
Senior Line of Credit | Revolving Credit Facility | Borrowing Base Utilization Percentage Less Than 50%            
Line Of Credit Facility [Line Items]            
Commitment fee payable rate (percent)   0.375%        
Senior Line of Credit | Revolving Credit Facility | Borrowing Base Utilization Percentage Equal to or Greater Than 50%            
Line Of Credit Facility [Line Items]            
Commitment fee payable rate (percent)   0.50%        
Senior Line of Credit | Revolving Credit Facility | Minimum            
Line Of Credit Facility [Line Items]            
Interest payable, term   90 days        
Current ratio   1.0        
Senior Line of Credit | Revolving Credit Facility | Minimum | LIBOR Plus Margin Rate            
Line Of Credit Facility [Line Items]            
Interest rate (percent) 1.75%          
Senior Line of Credit | Revolving Credit Facility | Minimum | Prime Rate Plus Margin Rate            
Line Of Credit Facility [Line Items]            
Interest rate (percent) 0.75%          
Senior Line of Credit | Revolving Credit Facility | Maximum            
Line Of Credit Facility [Line Items]            
Ratio of total debt to EBITDAX   3.5        
Senior Line of Credit | Revolving Credit Facility | Maximum | LIBOR Plus Margin Rate            
Line Of Credit Facility [Line Items]            
Interest rate (percent) 2.75%          
Senior Line of Credit | Revolving Credit Facility | Maximum | Prime Rate Plus Margin Rate            
Line Of Credit Facility [Line Items]            
Interest rate (percent) 1.75%