Annual report pursuant to Section 13 and 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
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total Level 3 investments $ 4,286,271 [1] $ 4,102,177 [2]
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total Level 3 investments $ 4,286,271 $ 4,100,273
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 0.065
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 0.316 0.433
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 7.2 6.1
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 $ 1,402,354 $ 1,172,077
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 0.097 0.094
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 0.227 0.225
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 0.145 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 0.155 0.154
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 4.3
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 8.3
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 6.7
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 6.0
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 $ 2,720,425 $ 2,663,958
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 0.085
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 0.180 0.188
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 0.129 0.122
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 0.124
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 0.997 0.994
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 $ 163,492 $ 264,238
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 3.0 5.6
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 100.0 98.5
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 89.8 87.0
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 92.4 91.4
[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.