Quarterly report [Sections 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)

v3.25.2
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, 2025
Jun. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 3,613,959 $ 3,185,103
Net realized gains (losses) (55,343) (8,685)
Net change in unrealized appreciation (depreciation) 24,489 (24,792)
Purchases 1,011,967 867,008
Sales (51,926) (21,478)
Repayments (421,285) (493,121)
Gross Transfers into Level 3 22,558 4,093
Gross Transfers out of Level 3 (22,558) (4,093)
Ending balance 4,121,861 3,504,035
Accounts payable and accrued liabilities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance (1,012)  
Net change in unrealized appreciation (depreciation) 751  
Purchases 1,564  
Sales (1,652)  
Ending balance (349)  
Preferred Stock    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 53,802 53,038
Net change in unrealized appreciation (depreciation) (1,973) (10,541)
Purchases 2,820 1,597
Gross Transfers into Level 3   2,431
Ending balance 54,649 46,525
Common Stock    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 44,593 41,790
Net realized gains (losses) (645) (89)
Net change in unrealized appreciation (depreciation) 2,812 (2,018)
Purchases 908 4,100
Sales (956)  
Gross Transfers into Level 3 22,558 1,662
Gross Transfers out of Level 3 (5,094)  
Ending balance 64,176 45,445
Warrants    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 21,823 22,088
Net realized gains (losses) (374) 464
Net change in unrealized appreciation (depreciation) 552 (4,509)
Purchases 2,485 2,454
Sales (7) (2,829)
Ending balance 24,479 17,668
Senior Secured Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 3,419,044 2,987,577
Net realized gains (losses) (54,380) (9,120)
Net change in unrealized appreciation (depreciation) 21,867 (17,797)
Purchases 999,661 856,973
Sales (47,500)  
Repayments (421,285) (493,121)
Gross Transfers out of Level 3 (5,242) (4,093)
Ending balance 3,912,165 3,320,419
Unsecured Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 75,557 69,722
Net change in unrealized appreciation (depreciation) 480 527
Purchases 2,715 1,841
Gross Transfers out of Level 3 (12,222)  
Ending balance 66,530 72,090
Escrow and Other Investment Receivables    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 152 10,888
Net realized gains (losses) 56 60
Net change in unrealized appreciation (depreciation)   9,546
Purchases 1,814 43
Sales (1,811) (18,649)
Ending balance $ 211 $ 1,888