Quarterly report [Sections 13 or 15(d)]

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

v3.25.1
FAIR VALUE HIERARCHY FOR INVESTMENTS—PORTFOLIO COMPOSITION - Schedule of Investments (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
company
Dec. 31, 2024
USD ($)
company
Summary of Investment Holdings [Line Items]    
Fair value $ 1,260,853 [1] $ 1,177,507 [2]
Cost $ 1,203,330 [3] $ 1,138,745 [4]
Concentration risk, percentage (as a percent) 100.00% 100.00%
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) 6.10% 5.60%
Investment Owned, At Cost | Investment Type Concentration Risk | Equity investments    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage (as a percent) 14.40% 14.50%
Investment Owned, At Cost | Investment Type Concentration Risk | First lien debt    
Summary of Investment Holdings [Line Items]    
Concentration risk, percentage (as a percent) 85.40% 85.20%
Private Loan portfolio investments    
Summary of Investment Holdings [Line Items]    
Number of portfolio companies | company 84 84
Fair value $ 767,800 $ 677,900
Cost $ 790,000 $ 697,500
Weighted-average annual effective yield (as a percent) 11.60% 12.00%
Average EBITDA $ 32,300 $ 28,600
Investment company, number of companies within portfolio excluded from EBITDA calculation | company 4 2
Private Loan portfolio investments | Nonperforming Financial Instruments    
Summary of Investment Holdings [Line Items]    
Weighted-average annual effective yield (as a percent) 10.90% 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 (as a percent) 93.50% 93.90%
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) 6.50% 6.10%
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% 99.90%
LMM portfolio investments    
Summary of Investment Holdings [Line Items]    
Number of portfolio companies | company 57 57
Fair value $ 439,700 $ 436,100
Cost $ 356,300 $ 357,100
Weighted-average annual effective yield (as a percent) 13.10% 13.00%
Average EBITDA $ 11,000 $ 10,800
Diluted equity ownership percentage (as a percent) 9.00% 9.00%
Investment company, number of companies within portfolio excluded from EBITDA calculation | company 4 3
LMM portfolio investments | Nonperforming Financial Instruments    
Summary of Investment Holdings [Line Items]    
Weighted-average annual effective yield (as a percent) 12.20% 12.20%
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) 67.70% 67.80%
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) 32.30% 32.20%
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%
[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.