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Long-Term Debt (Details)
3 Months Ended 12 Months Ended
May 16, 2019
May 07, 2019
USD ($)
Jul. 27, 2018
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Feb. 25, 2020
USD ($)
Apr. 17, 2019
USD ($)
Jul. 26, 2018
USD ($)
Debt Instrument [Line Items]                    
Unamortized debt issuance costs written off   $ 4,000,000                
Loss on extinguishment of debt   6,900,000     $ 6,892,000 $ 0 $ 0      
Prepayment premium paid         2,091,000 $ 0 $ 0      
Term Loan Facility                    
Debt Instrument [Line Items]                    
Line of credit, borrowing base     $ 125,000,000              
Prepayment premium paid   2,100,000                
Legal fees paid   $ 800,000                
Term Loan Facility | Base Rate                    
Debt Instrument [Line Items]                    
Basis spread on variable rate (as a percent)     4.50%              
Term Loan Facility | London Interbank Offered Rate (LIBOR)                    
Debt Instrument [Line Items]                    
Basis spread on variable rate (as a percent)     5.50%              
Term Loan Facility | London Interbank Offered Rate (LIBOR) | Minimum                    
Debt Instrument [Line Items]                    
Interest rate, floor (as a percent)     1.00%              
Delayed Draw Term Loan                    
Debt Instrument [Line Items]                    
Line of credit, borrowing base     $ 75,000,000              
Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Line of credit, borrowing base                   $ 150,000,000
Line of credit facility available     70,000,000              
Unamortized debt issuance costs written off       $ 300,000            
Long-term debt outstanding     70,000,000              
Revolving Credit Facility | Term Loan Facility                    
Debt Instrument [Line Items]                    
Line of credit, borrowing base     $ 10,000,000              
Brigham Resources, LLC | New Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Line of credit, borrowing base         $ 150,000,000.0       $ 135,000,000.0  
Debt instrument, covenant, current ratio, minimum 1.00                  
Debt instrument, covenant, total net funded debt to consolidated EBITDA ratio, maximum 4.00                  
Brigham Resources, LLC | New Revolving Credit Facility | Minimum                    
Debt Instrument [Line Items]                    
Commitment fee, percentage 0.375%                  
Brigham Resources, LLC | New Revolving Credit Facility | Maximum                    
Debt Instrument [Line Items]                    
Commitment fee, percentage 0.50%                  
Brigham Resources, LLC | New Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum                    
Debt Instrument [Line Items]                    
Basis spread on variable rate (as a percent) 1.75%                  
Brigham Resources, LLC | New Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum                    
Debt Instrument [Line Items]                    
Basis spread on variable rate (as a percent) 2.75%                  
Brigham Resources, LLC | New Revolving Credit Facility | Adjusted Base Rate | Minimum                    
Debt Instrument [Line Items]                    
Basis spread on variable rate (as a percent) 0.75%                  
Brigham Resources, LLC | New Revolving Credit Facility | Adjusted Base Rate | Maximum                    
Debt Instrument [Line Items]                    
Basis spread on variable rate (as a percent) 1.75%                  
Subsequent Event | New Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Line of credit, borrowing base               $ 180,000,000