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Long-Term Debt (Details)
3 Months Ended 6 Months Ended
May 16, 2019
USD ($)
May 07, 2019
USD ($)
Jul. 27, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
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     $ 6,933,000 $ 0  
Prepayment premium paid         $ 2,090,000 $ 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 $ 120,000,000            
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%