Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE HIERARCHY FOR INVESTMENTS???PORTFOLIO COMPOSITION - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details)

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FAIR VALUE HIERARCHY FOR INVESTMENTS—PORTFOLIO COMPOSITION - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total Level 3 investments $ 1,115,982 [1] $ 1,092,895 [2]
Significant Unobservable Inputs    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total Level 3 investments $ 1,115,982 $ 1,092,895
Significant Unobservable Inputs | Minimum | EBITDA multiple, outlier    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 2 2.0
Significant Unobservable Inputs | Minimum | Risk adjusted discount factor, outlier    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.080 0.080
Significant Unobservable Inputs | Maximum | EBITDA multiple, outlier    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 15.7 15.7
Significant Unobservable Inputs | Maximum | Risk adjusted discount factor, outlier    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.319 0.273
Significant Unobservable Inputs | Equity investments | Discounted cash flow    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total Level 3 investments $ 256,254 $ 254,770
Significant Unobservable Inputs | Equity investments | Discounted cash flow | Minimum | WACC    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.107 0.109
Significant Unobservable Inputs | Equity investments | Discounted cash flow | Maximum | WACC    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.224 0.225
Significant Unobservable Inputs | Equity investments | Discounted cash flow | Weighted Average | WACC    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.142 0.144
Significant Unobservable Inputs | Equity investments | Discounted cash flow | Median | WACC    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.151 0.155
Significant Unobservable Inputs | Equity investments | Market comparable / Enterprise value | Minimum | EBITDA multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 4.3 4.9
Significant Unobservable Inputs | Equity investments | Market comparable / Enterprise value | Maximum | EBITDA multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 9.4 9.2
Significant Unobservable Inputs | Equity investments | Market comparable / Enterprise value | Weighted Average | EBITDA multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 7.3 7.3
Significant Unobservable Inputs | Equity investments | Market comparable / Enterprise value | Median | EBITDA multiple    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 6.5 6.5
Significant Unobservable Inputs | Debt investments | Discounted cash flow    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total Level 3 investments $ 798,929 $ 777,003
Significant Unobservable Inputs | Debt investments | Discounted cash flow | Minimum | Risk adjusted discount factor    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.096 0.098
Significant Unobservable Inputs | Debt investments | Discounted cash flow | Minimum | Expected principal recovery percentage    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.003 0.006
Significant Unobservable Inputs | Debt investments | Discounted cash flow | Maximum | Risk adjusted discount factor    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.170 0.168
Significant Unobservable Inputs | Debt investments | Discounted cash flow | Maximum | Expected principal recovery percentage    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 1.000 1.000
Significant Unobservable Inputs | Debt investments | Discounted cash flow | Weighted Average | Risk adjusted discount factor    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.133 0.131
Significant Unobservable Inputs | Debt investments | Discounted cash flow | Weighted Average | Expected principal recovery percentage    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.993 0.996
Significant Unobservable Inputs | Debt investments | Discounted cash flow | Median | Risk adjusted discount factor    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.126 0.128
Significant Unobservable Inputs | Debt investments | Discounted cash flow | Median | Expected principal recovery percentage    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 1.000 1.000
Significant Unobservable Inputs | Debt investments | Market approach    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total Level 3 investments $ 60,799 $ 61,122
Significant Unobservable Inputs | Debt investments | Market approach | Minimum | Third-party quote    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 38.3 4.5
Significant Unobservable Inputs | Debt investments | Market approach | Maximum | Third-party quote    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 100.5 99.2
Significant Unobservable Inputs | Debt investments | Market approach | Weighted Average | Third-party quote    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 85.2 85.0
Significant Unobservable Inputs | Debt investments | Market approach | Median | Third-party quote    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 91.5 89.5
[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.