Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE HIERARCHY FOR INVESTMENTS???PORTFOLIO COMPOSITION - Schedule of Investments (Details)

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FAIR VALUE HIERARCHY FOR INVESTMENTS—PORTFOLIO COMPOSITION - Schedule of Investments (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
company
Dec. 31, 2023
USD ($)
company
Summary of Investment Holdings [Line Items]    
Fair value $ 1,115,982 [1] $ 1,092,895 [2]
Cost $ 1,062,538 [3] $ 1,038,318 [4]
Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage (as a percent) 100.00% 100.00%
Investment Owned, At Cost | Investment Type Concentration Risk | Nonperforming Financial Instruments    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage (as a percent) 3.60% 4.00%
Investment Owned, At Cost | Investment Type Concentration Risk | Equity investments    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage (as a percent) 12.90% 13.30%
Investment Owned, At Cost | Investment Type Concentration Risk | First lien debt    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage (as a percent) 86.90% 86.50%
Private Loan portfolio investments    
Summary of Investment Holdings [Line Items]    
Number of portfolio companies | company 79 78
Fair value $ 631,400 $ 595,300
Cost $ 624,300 $ 586,400
Weighted-average annual effective yield (as a percent) 13.00% 13.10%
Average EBITDA $ 34,700 $ 30,500
Investment company, number of companies within portfolio excluded from EBITDA calculation | company 1 1
Private Loan portfolio investments | Nonperforming Financial Instruments    
Summary of Investment Holdings [Line Items]    
Weighted-average annual effective yield (as a percent) 12.60% 12.60%
Private Loan portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | Debt investments    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage (as a percent) 94.60% 94.10%
Private Loan portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | Equity investments    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage (as a percent) 5.40% 5.90%
Private Loan portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | First lien debt    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage (as a percent) 99.90% 100.00%
LMM portfolio investments    
Summary of Investment Holdings [Line Items]    
Number of portfolio companies | company 51 50
Fair value $ 391,600 $ 387,000
Cost $ 319,200 $ 315,700
Weighted-average annual effective yield (as a percent) 13.00% 13.00%
Average EBITDA $ 9,200 $ 8,800
Diluted equity ownership percentage (as a percent) 9.00% 9.00%
Investment company, number of companies within portfolio excluded from EBITDA calculation | company 2  
LMM portfolio investments | Nonperforming Financial Instruments    
Summary of Investment Holdings [Line Items]    
Weighted-average annual effective yield (as a percent) 13.00% 13.00%
LMM portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | Debt investments    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage (as a percent) 70.30% 70.20%
LMM portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | Equity investments    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage (as a percent) 29.70% 29.80%
LMM portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | First lien debt    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage (as a percent) 99.90% 99.90%
Middle Market portfolio investments    
Summary of Investment Holdings [Line Items]    
Number of portfolio companies | company 15 16
Fair value $ 68,400 $ 86,000
Cost $ 97,700 $ 114,700
Weighted-average annual effective yield (as a percent) 13.40% 13.00%
Average EBITDA $ 62,500 $ 74,200
Investment company, number of companies within portfolio excluded from EBITDA calculation | company 1  
Middle Market portfolio investments | Nonperforming Financial Instruments    
Summary of Investment Holdings [Line Items]    
Weighted-average annual effective yield (as a percent) 10.10% 9.90%
Middle Market portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | Debt investments    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage (as a percent) 91.70% 93.10%
Middle Market portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | Equity investments    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage (as a percent) 8.30% 6.90%
Middle Market portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | First lien debt    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage (as a percent) 99.90% 100.00%
[1] 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.
[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] 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.
[4] 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.