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
 6 Months Ended
Jun. 30, 2026
Jun. 30, 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) 64 (55,343)
Net Change in Unrealized Appreciation (Depreciation) (24,132) 24,489
Purchases 1,001,458 984,477
Capitalized PIK Interest 25,441 27,490
Sales (32,125) (51,926)
Repayments (863,476) (421,285)
Gross Transfers into Level 3 0 22,558
Gross Transfers out of Level 3 (1,632) (22,558)
Ending balance 4,530,607 4,121,861
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)   751
Purchases 2 1,564
Sales (8) (1,652)
Ending balance (93) (349)
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) 1,600  
Net Change in Unrealized Appreciation (Depreciation) 300 (1,973)
Purchases 7,868 2,820
Sales (5,794)  
Gross Transfers out of Level 3 (1,331)  
Ending balance 55,378 54,649
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) (2,217) (645)
Net Change in Unrealized Appreciation (Depreciation) (1,826) 2,812
Purchases 721 908
Sales (600) (956)
Gross Transfers into Level 3   22,558
Gross Transfers out of Level 3   (5,094)
Ending balance 60,798 64,176
Warrants    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 28,061 21,823
Net Realized Gains (Losses) 457 (374)
Net Change in Unrealized Appreciation (Depreciation) 8,291 552
Purchases 3,204 2,485
Sales (1,594) (7)
Gross Transfers out of Level 3 (301)  
Ending balance 38,118 24,479
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) 257 (54,380)
Net Change in Unrealized Appreciation (Depreciation) (27,866) 21,867
Purchases 981,383 974,777
Capitalized PIK Interest 23,671 24,884
Sales (24,086) (47,500)
Repayments (863,476) (421,285)
Gross Transfers out of Level 3   (5,242)
Ending balance 4,299,681 3,912,165
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) (3,009) 480
Purchases 8,168 109
Capitalized PIK Interest 1,770 2,606
Gross Transfers out of Level 3   (12,222)
Ending balance 76,543 66,530
Escrow Receivables    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 168  
Net Realized Gains (Losses) (33)  
Net Change in Unrealized Appreciation (Depreciation) (22)  
Purchases 112  
Sales (43)  
Ending balance $ 182  
Escrow and Other Investment 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   (1,811)
Ending balance   $ 211