Quarterly report pursuant to Section 13 or 15(d)

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

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FAIR VALUE HIERARCHY FOR INVESTMENTS—PORTFOLIO COMPOSITION - Level 3 Portfolio Investments (Details)
$ in Thousands
Sep. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
 [2],[4],[5]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Total Level 3 investments $ 3,973,490 $ 3,561,831 [1],[2],[3] $ 3,973,490
Significant Unobservable Inputs (Level 3)      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Total Level 3 investments $ 3,971,635 $ 3,559,837  
Significant Unobservable Inputs (Level 3) | EBITDA multiple, outlier | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Range 2.2 2.2  
Significant Unobservable Inputs (Level 3) | EBITDA multiple, outlier | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Range 15.7 11.0  
Significant Unobservable Inputs (Level 3) | Risk adjusted discount factor, outlier | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Range 0.050 0.042  
Significant Unobservable Inputs (Level 3) | Risk adjusted discount factor, outlier | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Range 0.354 0.385  
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 $ 1,105,236 $ 1,050,269  
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 0.094 0.091  
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 0.224 0.206  
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 0.145 0.138  
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 0.156 0.148  
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 4.3 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]      
Range 8.3 7.7  
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 6.7 6.6  
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 6.0 5.9  
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 $ 2,548,347 $ 2,158,424  
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 0.065 0.056  
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 0.170 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 0.103 0.098  
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 0.104 0.093  
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 2.000 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 0.996 0.996  
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 $ 318,052 $ 351,144  
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 5.6 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]      
Range 98.9 100.5  
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 90.6 94.4  
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 93.0 99.0  
[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.
[2] All investments are Lower Middle Market portfolio investments, unless otherwise noted. See Note C—Fair Value Hierarchy for Investments—Portfolio Composition for a description of Lower Middle Market portfolio investments. All of the Company’s investments, unless otherwise noted, are encumbered either as security for the Company’s Credit Facility or in support of the SBA-guaranteed debentures issued by the Funds.
[3] All portfolio company headquarters are based in the United States, unless otherwise noted.
[4] 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.
[5] All portfolio company headquarters are based in the United States, unless otherwise noted.