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
 6 Months Ended
Jun. 30, 2024
Jun. 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) (8,685) (9,469)
Net change in unrealized appreciation (depreciation) (24,792) 34,352
Purchases 867,008 653,225
Sales (21,478) (753)
Repayments (493,121) (524,679)
Gross Transfers into Level 3 4,093 0
Gross Transfers out of Level 3 (4,093) 0
Ending balance 3,504,035 3,034,961
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) 0 (1,941)
Net change in unrealized appreciation (depreciation) (10,541) 1,702
Purchases 1,597 0
Gross Transfers into Level 3 2,431  
Ending balance 46,525 41,249
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) (89)  
Net change in unrealized appreciation (depreciation) (2,018) 8,322
Purchases 4,100 1,000
Sales 0 (594)
Gross Transfers into Level 3 1,662  
Ending balance 45,445 33,787
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 (1,763)
Net change in unrealized appreciation (depreciation) (4,509) 722
Purchases 2,454 2,809
Sales (2,829) (7)
Ending balance 17,668 21,180
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) (5,845)
Net change in unrealized appreciation (depreciation) (17,797) 19,330
Purchases 856,973 648,729
Repayments (493,121) (524,679)
Gross Transfers out of Level 3 (4,093)  
Ending balance 3,320,419 2,878,923
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) 527 4,276
Purchases 1,841 687
Ending balance 72,090 59,019
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) 60  
Net change in unrealized appreciation (depreciation) 9,546  
Purchases 43  
Sales (18,649)  
Ending balance $ 1,888  
Escrow Receivable    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance   875
Net realized gains (losses)   80
Sales   (152)
Ending balance   $ 803