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Debt - 2019 1 Debt (Details)
12 Months Ended
Jun. 15, 2023
Nov. 30, 2021
USD ($)
Aug. 28, 2019
USD ($)
Dec. 31, 2023
USD ($)
Loan
Dec. 31, 2022
USD ($)
Loan
Dec. 31, 2021
USD ($)
Debt            
Principal amount       $ 1,617,500,000 $ 1,667,500,000  
Net realized loss on extinguishment of debt         $ (747,000) $ (4,859,000)
Number of investments secured as collateral | Loan       49 49  
Fair value of investments secured as collateral       $ 453,700,000 $ 447,400,000  
Cash secured as collateral       52,800,000 56,000,000  
Unamortized debt issuance costs       7,567,000 10,197,000  
2019-1 Notes            
Debt            
Realized gains (losses) on debt securitization     $ 0      
Principal amount   $ 410,000,000 $ 501,000,000 352,500,000 352,500,000  
Net realized loss on extinguishment of debt   $ 2,300,000        
Membership interest retained (as a percent)   5.00%        
Unamortized debt issuance costs       1,300,000 $ 1,400,000 $ 1,500,000
2019-1 Notes | BCC Middle Market CLO 2019 | SOFR            
Debt            
Spread rate (as a percent) 0.26%          
Class A1R senior secured floating rate notes            
Debt            
Principal amount   $ 282,500,000   $ 282,500,000    
Interest rate (as a percent)   1.50%   7.16%    
Spread rate (as a percent)       1.50%    
Class A2R senior secured floating rate notes            
Debt            
Principal amount   $ 55,000,000   $ 55,000,000    
Interest rate (as a percent)   2.00%   7.66%    
Spread rate (as a percent)       2.00%    
Class BR senior deferrable floating rate notes            
Debt            
Principal amount   $ 47,500,000   $ 15,000,000    
Interest rate (as a percent)   2.60%   8.26%    
Debt instrument retained   $ 32,500,000        
Spread rate (as a percent)       2.60%    
Class CR senior deferrable floating rate notes            
Debt            
Principal amount   $ 25,000,000        
Interest rate (as a percent)   3.75%        
Debt instrument retained   $ 25,000,000