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Borrowings - Holdings Credit Facility (Details) - USD ($)
$ in Thousands
3 Months Ended 24 Months Ended
Apr. 28, 2023
Mar. 31, 2024
Mar. 31, 2023
Apr. 27, 2023
Dec. 31, 2023
Apr. 20, 2021
Jun. 09, 2018
Jun. 08, 2018
Nov. 05, 2014
Line of Credit Facility [Line Items]                  
Minimum asset coverage ratio             150.00% 200.00% 150.00%
Amortization of financing costs   $ 1,985 $ 1,637            
Holdings Credit Facility                  
Line of Credit Facility [Line Items]                  
Credit facility outstanding balance   291,563     $ 515,063        
Revolving Credit Facility | Holdings Credit Facility                  
Line of Credit Facility [Line Items]                  
Credit facility outstanding balance   291,563     $ 515,063        
Revolving Credit Facility | Holdings Credit Facility | Credit Facility                  
Line of Credit Facility [Line Items]                  
Maximum borrowing capacity           $ 800,000      
Available borrowing capacity   $ 730,000              
Borrowing capacity, first percentage   35.00%              
Borrowing capacity, second percentage   45.00%              
Borrowing capacity, third percentage   55.00%              
Borrowing capacity, fourth percentage   67.50%              
Borrowing capacity, fifth percentage   70.00%              
Minimum asset coverage ratio   150.00%              
Interest expense   $ 7,087 10,287            
Non-usage fee   508 118            
Amortization of financing costs   $ 576 $ 464            
Weighted average interest rate   7.80% 6.60%            
Effective interest rate   9.20% 7.00%            
Average debt outstanding   $ 358,489 $ 634,146            
Revolving Credit Facility | Holdings Credit Facility, Broadly Syndicated Loans | Credit Facility | SOFR                  
Line of Credit Facility [Line Items]                  
Interest rate margin 1.70%                
Revolving Credit Facility | Holdings Credit Facility, Broadly Syndicated Loans | Credit Facility | LIBOR                  
Line of Credit Facility [Line Items]                  
Interest rate margin       1.60%          
Revolving Credit Facility | Holdings Credit Facility, Excluding Broadly Syndicated Loans | Credit Facility | SOFR                  
Line of Credit Facility [Line Items]                  
Interest rate margin 2.20%     2.50%          
Revolving Credit Facility | Holdings Credit Facility, Excluding Broadly Syndicated Loans | Credit Facility | LIBOR                  
Line of Credit Facility [Line Items]                  
Interest rate margin       2.10%