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Borrowings - Unsecured Notes (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Nov. 01, 2021
Mar. 18, 2021
Debt Instrument [Line Items]            
Amortization of debt issuance costs     $ 1,153 $ 1,154    
Cash paid for interest expense     $ 15,602 $ 12,742    
Effective interest rate 6.07% 5.06% 5.95% 4.51%    
Average outstanding balance $ 323,781 $ 367,992 $ 331,792 $ 361,319    
Unsecured Notes            
Debt Instrument [Line Items]            
Debt covenant, asset coverage 150.00%   150.00%      
Stated interest expense $ 2,165 2,165 $ 6,495 6,495    
Amortization of debt issuance costs 245 259 734 779    
Total interest and debt financing costs 2,410 2,424 7,229 7,274    
Cash paid for interest expense $ 3,649 $ 3,649 $ 7,979 $ 8,002    
Effective interest rate 5.35% 5.39% 5.35% 5.39%    
Average outstanding balance $ 180,000 $ 180,000 $ 180,000 $ 180,000    
Unsecured Notes | Unsecured Notes Due February 2026            
Debt Instrument [Line Items]            
Aggregate principal           $ 125,000
Interest rate           4.75%
Unsecured Notes | Unsecured Notes Due October 2028            
Debt Instrument [Line Items]            
Aggregate principal         $ 55,000  
Interest rate         4.95%