Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments - Summary of Reconciliation of Changes for All Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)

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Fair Value of Financial Instruments - Summary of Reconciliation of Changes for All Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Significant Unobservable Inputs (Level 3) - Recurring - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 3,185,103 $ 2,882,285
Net realized gains (losses) (11,561) (12,204)
Net change in unrealized appreciation (depreciation) (39,187) (3,562)
Purchases 1,111,555 1,025,931
Sales (21,326) (1,909)
Repayments (732,225) (695,856)
Gross Transfers into Level 3 2,323 0
Gross Transfers out of Level 3 2,323 0
Ending balance 3,492,359 3,194,685
Accounts payable and accrued liabilities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 0  
Gross Transfers into Level 3 (1,770)  
Ending balance (1,770)  
Preferred Stock    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 53,038 41,488
Net realized gains (losses) (711) (3,441)
Net change in unrealized appreciation (depreciation) (9,013) 1,392
Purchases 1,597 2,851
Gross Transfers into Level 3 2,431  
Ending balance 47,342 42,290
Common Stock    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 41,790 25,059
Net realized gains (losses) (1,351)  
Net change in unrealized appreciation (depreciation) 474 10,684
Purchases 4,100 4,500
Sales 0 (594)
Gross Transfers into Level 3 1,662  
Ending balance 46,675 39,649
Warrants    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 22,088 19,419
Net realized gains (losses) (464) (3,443)
Net change in unrealized appreciation (depreciation) (2,367) 1,539
Purchases 2,948 3,711
Sales (2,829) (1,108)
Ending balance 19,376 20,118
Senior Secured Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 2,987,577 2,741,388
Net realized gains (losses) (9,120) (5,400)
Net change in unrealized appreciation (depreciation) (34,978) (22,135)
Purchases 1,099,563 1,003,953
Repayments (732,225) (695,856)
Gross Transfers out of Level 3 4,093  
Ending balance 3,306,724 3,021,950
Unsecured Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 69,722 54,056
Net change in unrealized appreciation (depreciation) 828 4,958
Purchases 3,304 10,916
Ending balance 73,854 69,930
Escrow and Other Investment Receivables    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 10,888  
Net realized gains (losses) 85  
Net change in unrealized appreciation (depreciation) 5,869  
Purchases 43  
Sales (18,497)  
Gross Transfers out of Level 3 1,770  
Ending balance $ 158  
Escrow Receivable    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance   875
Net realized gains (losses)   80
Sales   (207)
Ending balance   $ 748