Annual report pursuant to Section 13 and 15(d)

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

v3.24.0.1
FAIR VALUE HIERARCHY FOR INVESTMENTS—PORTFOLIO COMPOSITION - Schedule of Investments (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
company
Dec. 31, 2022
USD ($)
company
Summary of Investment Holdings [Line Items]    
Fair value $ 1,092,895 [1] $ 1,068,143 [2]
Cost $ 1,038,318 [3] $ 1,059,886 [4]
Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 100.00% 100.00%
Investment Owned, At Cost | Investment Type Concentration Risk | Nonperforming Financial Instruments    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 4.00% 4.80%
Investment Owned, At Cost | Investment Type Concentration Risk | Equity investments    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 13.30% 10.80%
Investment Owned, At Cost | Investment Type Concentration Risk | First lien debt    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 86.50% 88.50%
Private Loan portfolio investments    
Summary of Investment Holdings [Line Items]    
Number of portfolio companies | company 78 70
Fair value $ 595,300 $ 559,800
Cost $ 586,400 $ 563,000
Weighted-average annual effective yield 13.10% 11.80%
Average EBITDA $ 30,500 $ 36,800
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 12.60% 11.40%
Private Loan portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | Debt investments    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 94.10% 96.20%
Private Loan portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | Equity investments    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 5.90% 3.80%
Private Loan portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | First lien debt    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 100.00% 99.40%
LMM portfolio investments    
Summary of Investment Holdings [Line Items]    
Number of portfolio companies | company 50 48
Fair value $ 387,000 $ 352,700
Cost $ 315,700 $ 312,500
Weighted-average annual effective yield 13.00% 12.10%
Average EBITDA $ 8,800 $ 8,600
Diluted equity ownership percentage 9.00% 9.00%
LMM portfolio investments | Nonperforming Financial Instruments    
Summary of Investment Holdings [Line Items]    
Weighted-average annual effective yield 13.00% 11.70%
LMM portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | Debt investments    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 70.20% 73.20%
LMM portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | Equity investments    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 29.80% 26.80%
LMM portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | First lien debt    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 99.90% 99.90%
Middle Market portfolio investments    
Summary of Investment Holdings [Line Items]    
Number of portfolio companies | company 16 21
Fair value $ 86,000 $ 126,700
Cost $ 114,700 $ 159,700
Weighted-average annual effective yield 13.00% 11.30%
Average EBITDA $ 74,200 $ 79,200
Middle Market portfolio investments | Nonperforming Financial Instruments    
Summary of Investment Holdings [Line Items]    
Weighted-average annual effective yield 9.90% 9.70%
Middle Market portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | Debt investments    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 93.10% 95.00%
Middle Market portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | Equity investments    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 6.90% 5.00%
Middle Market portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | First lien debt    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage 100.00% 98.50%
[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.