Quarterly report pursuant to Section 13 or 15(d)

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

v3.23.1
FAIR VALUE HIERARCHY FOR INVESTMENTS—PORTFOLIO COMPOSITION - Level 3 Portfolio Investments (Details)
$ in Thousands
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2022
USD ($)
 [2]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Total Level 3 investments $ 4,160,917 $ 4,102,177 [1] $ 4,160,917
Significant Unobservable Inputs (Level 3)      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Total Level 3 investments $ 4,158,975 $ 4,100,273  
Significant Unobservable Inputs (Level 3) | EBITDA multiple, outlier | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Range 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]      
Range 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]      
Range 0.034 0.038  
Significant Unobservable Inputs (Level 3) | Risk adjusted discount factor, outlier | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Range 0.350 0.433  
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 $ 1,217,243 $ 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]      
Range 0.093 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]      
Range 0.223 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]      
Range 0.144 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]      
Range 0.152 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]      
Range 4.5 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]      
Range 8.5 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]      
Range 6.8 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]      
Range 6.2 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 $ 2,696,096 $ 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]      
Range 0.060 0.057  
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]      
Range 0.164 0.157  
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]      
Range 0.102 0.100  
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]      
Range 0.105 0.103  
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]      
Range 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]      
Range 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]      
Range 0.995 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]      
Range 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 $ 245,636 $ 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]      
Range 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]      
Range 97.5 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]      
Range 87.3 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]      
Range 93.9 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.