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

FAIR VALUE HIERARCHY FOR INVESTMENTS???PORTFOLIO COMPOSITION - Narrative (Details)

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FAIR VALUE HIERARCHY FOR INVESTMENTS—PORTFOLIO COMPOSITION - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
USD ($)
company
investmentManager
entity
Dec. 31, 2024
USD ($)
company
entity
investmentManager
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Achieved total return on investments 0.139 0.124
Fair value $ 1,335,387 [1],[2],[3] $ 1,177,507 [4],[5],[6]
Cost $ 1,259,923 [1],[3],[7] $ 1,138,745 [4],[6],[8]
Concentration risk, percentage (as a percent) 100.00% 100.00%
Investment Owned, At Fair Value | Investment Type Concentration Risk    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Concentration risk, percentage (as a percent) 100.00% 100.00%
Investment Owned, At Cost | Investment Type Concentration Risk    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Concentration risk, percentage (as a percent) 100.00% 100.00%
Private Loan    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Number of portfolio companies | company 81 84
Fair value $ 809,000 $ 677,900
Cost $ 821,700 $ 697,500
Private Loan | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Concentration risk, percentage (as a percent) 81.00% 85.00%
Private Loan | Debt investments | Investment Owned, At Cost | Investment Type Concentration Risk    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Concentration risk, percentage (as a percent) 92.10% 93.90%
Private Loan | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Annual revenues $ 25,000  
Investments $ 1,000  
Private Loan | Minimum | Debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment, term 3 years  
Private Loan | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Annual revenues $ 500,000  
Investments $ 30,000  
Private Loan | Maximum | Debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment, term 7 years  
LMM portfolio investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Number of portfolio companies | company 55 57
Fair value $ 487,600 $ 436,100
Cost $ 384,800 $ 357,100
LMM portfolio investments | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Concentration risk, percentage (as a percent) 96.00% 92.00%
LMM portfolio investments | Debt investments | Investment Owned, At Cost | Investment Type Concentration Risk    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Concentration risk, percentage (as a percent) 70.60% 67.80%
LMM portfolio investments | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Annual revenues $ 10,000  
Investments $ 1,000  
LMM portfolio investments | Minimum | Debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment, term 5 years  
LMM portfolio investments | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Annual revenues $ 150,000  
Investments $ 30,000  
LMM portfolio investments | Maximum | Debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment, term 7 years  
Middle Market    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Number of portfolio companies | company 8 10
Fair value $ 23,300 $ 39,400
Cost $ 39,800 $ 66,300
Middle Market | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Concentration risk, percentage (as a percent) 1.70% 3.30%
Middle Market | Investment Owned, At Cost | Investment Type Concentration Risk    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Concentration risk, percentage (as a percent) 3.20% 5.80%
Middle Market | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments $ 1,000  
Middle Market | Minimum | Debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment, term 3 years  
Middle Market | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments $ 20,000  
Middle Market | Maximum | Debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment, term 7 years  
Other Portfolio investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Number of portfolio investments in entities | entity 6 6
Number of portfolio investments with investments managers | investmentManager 4 4
Fair value $ 15,500 $ 24,100
Cost $ 13,700 $ 17,900
Other Portfolio investments | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Concentration risk, percentage (as a percent) 1.20% 2.00%
Other Portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Concentration risk, percentage (as a percent) 1.10% 1.60%
Other Portfolio investments | Minimum | Debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment, term 5 years  
Other Portfolio investments | Maximum | Debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment, term 10 years  
[1] All portfolio company headquarters are based in the U.S., unless otherwise noted.
[2] Investment Fair Value was determined using significant unobservable inputs, unless otherwise noted. See Note C—Fair Value Hierarchy for Investments—Portfolio Composition for further discussion. Negative fair value is the result of the capitalized discount on the loan or the unfunded commitment being valued below par.
[3] All investments are LMM (as defined below) portfolio investments, unless otherwise noted. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of LMM portfolio investments. All of the Fund’s investments, unless otherwise noted, are encumbered as security for one of the Fund’s Credit Facilities (as defined below).
[4] All portfolio company headquarters are based in the U.S., unless otherwise noted.
[5] Investment Fair Value was determined using significant unobservable inputs, unless otherwise noted. See Note C—Fair Value Hierarchy for Investments—Portfolio Composition for further discussion. Negative fair value is the result of the capitalized discount on the loan or the unfunded commitment being valued below par.
[6] All investments are LMM portfolio investments, unless otherwise noted. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of LMM portfolio investments. All of the Fund’s investments, unless otherwise noted, are encumbered as security for one of the Fund’s Credit Facilities.
[7] Principal is net of repayments. Cost is net of repayments and accumulated unearned income. Negative cost is the result of the capitalized discount being greater than the principal amount outstanding on the loan.
[8] Principal is net of repayments. Cost is net of repayments and accumulated unearned income. Negative cost is the result of the capitalized discount being greater than the principal amount outstanding on the loan.