v3.25.4
Fair Value Measurement - Summary of Changes in Fair Value of Level 3 Assets By Investment Type (Details) - 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 [Line Items]    
Beginning Balance $ 2,071,217 $ 2,412,644
Purchases [1] 89,427 501,865
Net Realized Gain (Loss) (4,354) $ (112,044)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]   Realized Investment Gains (Losses)
Net Change in Unrealized Appreciation (Depreciation) (24,742) $ 41,075
Sales and Settlements [1] (606,634) (784,727)
Net Amortization of Premium/Discount 9,431 12,404
Ending Balance 1,534,345 2,071,217
Net Change in Unrealized Appreciation (Depreciation) for assets still held $ (30,802) $ (9,221)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Investments Gain (Loss) on Investments
1st Lien/Senior Secured Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance $ 1,976,683 $ 2,332,364
Purchases [1] 78,761 475,507
Net Realized Gain (Loss) (9,219) (117,724)
Net Change in Unrealized Appreciation (Depreciation) (5,253) 44,296
Sales and Settlements [1] (581,683) (770,083)
Net Amortization of Premium/Discount 9,198 12,323
Ending Balance 1,468,487 1,976,683
Net Change in Unrealized Appreciation (Depreciation) for assets still held (13,557) (7,049)
1st Lien/Last-Out Unitranche    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance 22,642 20,410
Purchases [1] 7,911 2,108
Net Change in Unrealized Appreciation (Depreciation) (1,160) 52
Sales and Settlements [1] 1  
Net Amortization of Premium/Discount 80 72
Ending Balance 29,474 22,642
Net Change in Unrealized Appreciation (Depreciation) for assets still held (1,159) 52
2nd Lien/Senior Secured Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance 3,587  
Purchases [1]   3,789
Net Change in Unrealized Appreciation (Depreciation) (1,061) (202)
Ending Balance 2,526 3,587
Net Change in Unrealized Appreciation (Depreciation) for assets still held (1,061) (202)
Unsecured Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance 14,969 6,566
Purchases [1]   8,450
Net Change in Unrealized Appreciation (Depreciation) 158 (56)
Sales and Settlements [1] (8,626)  
Net Amortization of Premium/Discount 153 9
Ending Balance 6,654 14,969
Net Change in Unrealized Appreciation (Depreciation) for assets still held 96 (56)
Preferred Stock    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance 34,482 40,562
Purchases [1]   91
Net Realized Gain (Loss) 4,951 778
Net Change in Unrealized Appreciation (Depreciation) (2,165) 2,793
Sales and Settlements [1] (14,261) (9,742)
Ending Balance 23,007 34,482
Net Change in Unrealized Appreciation (Depreciation) for assets still held 1,335 3,085
Common Stock    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance 18,475 12,522
Purchases [1] 2,755 11,920
Net Realized Gain (Loss) (86) 4,902
Net Change in Unrealized Appreciation (Depreciation) (15,105) (5,967)
Sales and Settlements [1] (2,065) (4,902)
Ending Balance 3,974 18,475
Net Change in Unrealized Appreciation (Depreciation) for assets still held (16,300) (5,210)
Warrants    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance 379 220
Net Change in Unrealized Appreciation (Depreciation) (156) 159
Ending Balance 223 379
Net Change in Unrealized Appreciation (Depreciation) for assets still held $ (156) $ 159
[1] Purchases may include PIK, securities received in corporate actions and restructurings. Sales and Settlements may include securities delivered in corporate actions and restructuring of investments.