Annual report [Section 13 and 15(d), not S-K Item 405]

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

v3.25.4
Fair Value of Financial Instruments - Schedule of Reconciliation of Changes for All Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Significant Unobservable Inputs (Level 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Roll Forward]    
Beginning Balance $ 3,613,959 $ 3,185,103
Net Realized Gains (Losses) (57,573) $ (65,781)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]   Realized Investment Gains (Loss) And Gain (Loss) On Extinguishment Of Debt
Net Change in Unrealized Appreciation (Depreciation) 37,509 $ (10,738)
Purchases 1,720,301 1,494,274
Capitalized PIK Interest 55,686  
Sales (84,937) (22,693)
Repayments (861,784) (965,924)
Gross Transfers into Level 3 24,406 2,323
Gross Transfers out of Level 3 (22,558) (2,605)
Ending Balance 4,425,009 3,613,959
Accounts Payable and Accrued Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Roll Forward]    
Beginning Balance (1,012) 0
Net Realized Gains (Losses) (568) (10,938)
Net Change in Unrealized Appreciation (Depreciation) 1,534 11,179
Purchase 2,008 1,870
Sales (2,049) (1,353)
Gross Transfers into Level 3   (1,770)
Ending Balance (87) (1,012)
Preferred Stock    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Roll Forward]    
Beginning Balance 53,802 53,038
Net Realized Gains (Losses) 377 (711)
Net Change in Unrealized Appreciation (Depreciation) (3,116) (5,709)
Purchases 4,329 4,753
Sales (2,657)  
Gross Transfers into Level 3   2,431
Ending Balance 52,735 53,802
Common Stock    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Roll Forward]    
Beginning Balance 44,593 41,790
Net Realized Gains (Losses) (645) (1,453)
Net Change in Unrealized Appreciation (Depreciation) 2,325 (1,506)
Purchases 1,041 4,100
Sales (1,906)  
Gross Transfers into Level 3 24,406 1,662
Gross Transfers out of Level 3 (5,094)  
Ending Balance 64,720 44,593
Warrants    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Roll Forward]    
Beginning Balance 21,823 22,088
Net Realized Gains (Losses) 983 (648)
Net Change in Unrealized Appreciation (Depreciation) 98 (702)
Purchases 7,046 3,914
Sales (1,889) (2,829)
Ending Balance 28,061 21,823
Senior Secured Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Roll Forward]    
Beginning Balance 3,419,044 2,987,577
Net Realized Gains (Losses) (57,524) (52,120)
Net Change in Unrealized Appreciation (Depreciation) 35,499 (21,146)
Purchases 1,703,758 1,475,032
Capitalized PIK Interest 50,236  
Sales (74,189)  
Repayments (861,784) (965,924)
Gross Transfers out of Level 3 (5,242) (4,375)
Ending Balance 4,209,798 3,419,044
Unsecured Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Roll Forward]    
Beginning Balance 75,557 69,722
Net Change in Unrealized Appreciation (Depreciation) 903 1,277
Purchases 258 4,558
Capitalized PIK Interest 5,450  
Sales (332)  
Gross Transfers out of Level 3 (12,222)  
Ending Balance 69,614 75,557
Escrow Receivables/Escrow and Other Investment Receivables    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Roll Forward]    
Beginning Balance 152 10,888
Net Realized Gains (Losses) (196) 89
Net Change in Unrealized Appreciation (Depreciation) 266 5,869
Purchases 1,861 47
Sales (1,915) (18,511)
Gross Transfers out of Level 3   1,770
Ending Balance $ 168 $ 152