Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE HIERARCHY FOR INVESTMENTS???PORTFOLIO COMPOSITION - Schedule of Level??3 Portfolio Investments (Details)

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FAIR VALUE HIERARCHY FOR INVESTMENTS—PORTFOLIO COMPOSITION - Schedule of Level 3 Portfolio Investments (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total Level 3 investments $ 4,911,054 [1] $ 4,286,271 [2]
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total Level 3 investments $ 4,911,054 $ 4,286,271
Significant Unobservable Inputs (Level 3) | EBITDA multiple, outlier | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 2.0 2.0
Significant Unobservable Inputs (Level 3) | EBITDA multiple, outlier | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 15.7 15.7
Significant Unobservable Inputs (Level 3) | Risk adjusted discount factor, outlier | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.070 0.070
Significant Unobservable Inputs (Level 3) | Risk adjusted discount factor, outlier | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.318 0.316
Significant Unobservable Inputs (Level 3) | Market comparable / Enterprise value | Fee multiple | External Investment Manager | Related Party    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 7.9 7.2
Significant Unobservable Inputs (Level 3) | Equity investments | Discounted cash flow    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total Level 3 investments $ 1,564,812 $ 1,402,354
Significant Unobservable Inputs (Level 3) | Equity investments | Discounted cash flow | WACC | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.091 0.097
Significant Unobservable Inputs (Level 3) | Equity investments | Discounted cash flow | WACC | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.226 0.227
Significant Unobservable Inputs (Level 3) | Equity investments | Discounted cash flow | WACC | Weighted-Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.142 0.145
Significant Unobservable Inputs (Level 3) | Equity investments | Discounted cash flow | WACC | Median    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.150 0.155
Significant Unobservable Inputs (Level 3) | Equity investments | Market comparable / Enterprise value | EBITDA multiple | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 4.8 4.8
Significant Unobservable Inputs (Level 3) | Equity investments | Market comparable / Enterprise value | EBITDA multiple | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 8.9 8.9
Significant Unobservable Inputs (Level 3) | Equity investments | Market comparable / Enterprise value | EBITDA multiple | Weighted-Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 7.1 7.1
Significant Unobservable Inputs (Level 3) | Equity investments | Market comparable / Enterprise value | EBITDA multiple | Median    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 6.4 6.4
Significant Unobservable Inputs (Level 3) | Debt investments | Discounted cash flow    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total Level 3 investments $ 3,221,121 $ 2,720,425
Significant Unobservable Inputs (Level 3) | Debt investments | Discounted cash flow | Risk adjusted discount factor | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.098 0.098
Significant Unobservable Inputs (Level 3) | Debt investments | Discounted cash flow | Risk adjusted discount factor | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.189 0.180
Significant Unobservable Inputs (Level 3) | Debt investments | Discounted cash flow | Risk adjusted discount factor | Weighted-Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.131 0.129
Significant Unobservable Inputs (Level 3) | Debt investments | Discounted cash flow | Risk adjusted discount factor | Median    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.130 0.130
Significant Unobservable Inputs (Level 3) | Debt investments | Discounted cash flow | Expected principal recovery percentage | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.000 0.000
Significant Unobservable Inputs (Level 3) | Debt investments | Discounted cash flow | Expected principal recovery percentage | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 1.000 1.000
Significant Unobservable Inputs (Level 3) | Debt investments | Discounted cash flow | Expected principal recovery percentage | Weighted-Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 0.995 0.997
Significant Unobservable Inputs (Level 3) | Debt investments | Discounted cash flow | Expected principal recovery percentage | Median    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 1.000 1.000
Significant Unobservable Inputs (Level 3) | Debt investments | Market approach    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total Level 3 investments $ 125,121 $ 163,492
Significant Unobservable Inputs (Level 3) | Debt investments | Market approach | Third-party quote | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 27.5 3.0
Significant Unobservable Inputs (Level 3) | Debt investments | Market approach | Third-party quote | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 99.9 100.0
Significant Unobservable Inputs (Level 3) | Debt investments | Market approach | Third-party quote | Weighted-Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 90.8 89.8
Significant Unobservable Inputs (Level 3) | Debt investments | Market approach | Third-party quote | Median    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Measurement input 94.3 92.4
[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.