Quarterly report [Sections 13 or 15(d)]

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

v3.26.1
Fair Value of Financial Instruments - Schedule of Reconciliation Changes for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Significant Unobservable Inputs (Level 3) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 4,425,009 $ 3,613,959
Net Realized Gains (Losses) (1,934) (725)
Net Change in Unrealized Appreciation (Depreciation) (42,481) (32,252)
Purchases 535,755 421,243
Capitalized PIK Interest 12,746 13,946
Sales (10,163) (749)
Repayments (235,350) (148,147)
Gross Transfers into Level 3 0 17,316
Gross Transfers out of Level 3 0 (12,222)
Ending balance 4,683,582 3,872,369
Accounts payable and accrued liabilities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance (87) (1,012)
Net Change in Unrealized Appreciation (Depreciation)   358
Purchases 1 44
Sales   (362)
Ending balance (86) (972)
Preferred Stock    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 52,735 53,802
Net Realized Gains (Losses) 77  
Net Change in Unrealized Appreciation (Depreciation) (3,148) (3,953)
Purchases 6,056 2,813
Sales (2,271)  
Ending balance 53,449 52,662
Common Stock    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 64,720 44,593
Net Realized Gains (Losses) (1,910) (670)
Net Change in Unrealized Appreciation (Depreciation) (4,074) (2,014)
Purchases 648  
Sales (300) (331)
Gross Transfers into Level 3   17,316
Ending balance 59,084 58,894
Warrants    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 28,061 21,823
Net Realized Gains (Losses) (68) (63)
Net Change in Unrealized Appreciation (Depreciation) 1,920 (1,527)
Purchases 1,012 352
Sales (49)  
Ending balance 30,876 20,585
Senior Secured Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 4,209,798 3,419,044
Net Realized Gains (Losses)   (48)
Net Change in Unrealized Appreciation (Depreciation) (34,788) (25,181)
Purchases 524,980 416,157
Capitalized PIK Interest 11,879 12,673
Sales (7,500)  
Repayments (235,350) (148,147)
Ending balance 4,469,019 3,674,498
Unsecured Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 69,614 75,557
Net Change in Unrealized Appreciation (Depreciation) (2,391) 65
Purchases 3,036 63
Capitalized PIK Interest 867 1,273
Gross Transfers out of Level 3   (12,222)
Ending balance 71,126 64,736
Escrow Receivables    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 168  
Net Realized Gains (Losses) (33)  
Purchases 22  
Sales (43)  
Ending balance $ 114  
Escrow Receivables    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance   152
Net Realized Gains (Losses)   56
Purchases   1,814
Sales   (56)
Ending balance   $ 1,966