v3.26.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
Jun. 30, 2026
USD ($)
segment
company
Jun. 30, 2025
company
Jun. 30, 2026
USD ($)
company
Dec. 31, 2025
USD ($)
Schedule of Investments [Line Items]            
Concentration risk, percentage (as a percent)     100.00%     100.00%
Cash equivalents $ 20,300   $ 20,300   $ 20,300 $ 11,100
Cash balances exceeded federal deposit insurance corporation insurance protection levels 6,900   6,900   6,900 8,500
Investments at fair value 1,389,403 [1],[2],[3]   1,389,403 [1],[2],[3]   1,389,403 [1],[2],[3] 1,335,387 [4]
Investment, cost $ 1,307,825 [1],[3],[5]   $ 1,307,825 [1],[3],[5]   1,307,825 [1],[3],[5] 1,259,923 [6]
Percentage of total investment income, attributable to noncash paid-in-kind interest income (as a percent) 7.10% 5.60% 7.20% 5.70%    
Percentage of total investment income, attributable to noncash cumulative dividend income (as a percent) 0.80% 1.50% 0.80% 0.90%    
Percentage of total investment income, attributable to interest income, debt investments, net (as a percent) 2.30% 2.30% 2.40% 2.30%    
Number of reportable segments | segment     1      
Nonperforming Financial Instruments            
Schedule of Investments [Line Items]            
Investments at fair value $ 26,700   $ 26,700   26,700 13,700
Investment, cost 76,300   $ 76,300   $ 76,300 $ 49,000
Investment Owned, At Fair Value | Investment Type Concentration Risk            
Schedule of Investments [Line Items]            
Concentration risk, percentage (as a percent)     100.00%     100.00%
Investment Owned, At Fair Value | Investment Type Concentration Risk | Nonperforming Financial Instruments            
Schedule of Investments [Line Items]            
Concentration risk, percentage (as a percent)     1.90%     1.00%
Investment Owned, At Cost | Investment Type Concentration Risk            
Schedule of Investments [Line Items]            
Concentration risk, percentage (as a percent)     100.00%     100.00%
Investment Owned, At Cost | Investment Type Concentration Risk | Nonperforming Financial Instruments            
Schedule of Investments [Line Items]            
Concentration risk, percentage (as a percent)     5.80%     3.90%
Private Loan portfolio investments            
Schedule of Investments [Line Items]            
Consultation period subsequent to initial investment     12 months      
Investment company, number of portfolio companies with annual third-party appraisal was obtained, reviewed and certified | company     15 18 64  
Percentage of portfolio with annual third-party appraisal was obtained, reviewed and certified (as a percent)         97.00%  
Investments at fair value 848,500   $ 848,500   $ 848,500 $ 809,000
Investment, cost 856,300   $ 856,300   $ 856,300 821,700
Private Loan portfolio investments | Investment Owned, At Fair Value | Investment Type Concentration Risk            
Schedule of Investments [Line Items]            
Concentration risk, percentage (as a percent)     23.00% 22.00% 91.00%  
LMM portfolio investments            
Schedule of Investments [Line Items]            
Consultation period subsequent to initial investment     12 months      
Investment company, number of portfolio companies with annual third-party appraisal was obtained, reviewed and certified | company     13 16 47  
Percentage of portfolio with annual third-party appraisal was obtained, reviewed and certified (as a percent)         98.00%  
Investments at fair value 503,900   $ 503,900   $ 503,900 487,600
Investment, cost $ 397,600   $ 397,600   $ 397,600 $ 384,800
LMM portfolio investments | Investment Owned, At Fair Value | Investment Type Concentration Risk            
Schedule of Investments [Line Items]            
Concentration risk, percentage (as a percent)     19.00% 27.00% 97.00%  
Middle Market portfolio investments            
Schedule of Investments [Line Items]            
Percentage of portfolio investments containing limited consultation with financial advisory services firm (as a percent) 77.00%   77.00%   77.00% 85.00%
Investments at fair value $ 21,900   $ 21,900   $ 21,900 $ 23,300
Investment, cost 40,800   $ 40,800   40,800 $ 39,800
Middle Market portfolio investments | Investment Owned, At Fair Value | Investment Type Concentration Risk            
Schedule of Investments [Line Items]            
Concentration risk, percentage (as a percent)     1.60%     1.70%
Middle Market portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk            
Schedule of Investments [Line Items]            
Concentration risk, percentage (as a percent)     3.10%     3.20%
Other Portfolio investments            
Schedule of Investments [Line Items]            
Investments at fair value 15,200   $ 15,200   15,200 $ 15,500
Investment, cost $ 13,200   $ 13,200   $ 13,200 $ 13,700
Other Portfolio investments | Investment Owned, At Fair Value | Investment Type Concentration Risk            
Schedule of Investments [Line Items]            
Concentration risk, percentage (as a percent)     1.10%     1.20%
Other Portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk            
Schedule of Investments [Line Items]            
Concentration risk, percentage (as a percent)     1.00%     1.10%
[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 Credit Facilities (as defined below).
[4] 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.
[5] 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.
[6] 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.