v3.26.3
Fair Value Measurements - Schedule of Fair Value Inputs and Valuation Techniques (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 2,019,693 [1],[2] $ 1,488,856 [3],[4]
Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 1,724,644 [5] 1,163,003 [6]
Discounted Cash Flow | First Lien Debt Investments | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 1,505,634 [5] $ 963,798 [6]
Discounted Cash Flow | First Lien Debt Investments | Level 3 | Interest Rate Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input   0.30
Discounted Cash Flow | First Lien Debt Investments | Level 3 | Minimum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input 0.081 0.083
Discounted Cash Flow | First Lien Debt Investments | Level 3 | Maximum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input 0.136 0.254
Discounted Cash Flow | First Lien Debt Investments | Level 3 | Weighted Average | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input 0.114 [7] 0.102 [8]
Discounted Cash Flow | First Lien Debt Investments | Level 3 | Weighted Average | Interest Rate Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input [8]   0.30
Discounted Cash Flow | Mezzanine Debt Investments | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value [5] $ 1,434  
Investment, Measurement Input 0.184  
Discounted Cash Flow | Mezzanine Debt Investments | Level 3 | Weighted Average | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input [7] 0.184  
Discounted Cash Flow | Equity Investments | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 480 [5] $ 498 [6]
Investment, Measurement Input 0.109 0.101
Discounted Cash Flow | Equity Investments | Level 3 | Weighted Average | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input 0.109 [7] 0.101 [8]
Black Derman Toy | First Lien Debt Investments | Level 3 | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value [5] $ 98,982  
Black Derman Toy | First Lien Debt Investments | Level 3 | Interest Rate Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input 0.30  
Black Derman Toy | First Lien Debt Investments | Level 3 | Minimum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input 0.088  
Black Derman Toy | First Lien Debt Investments | Level 3 | Maximum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input 0.11  
Black Derman Toy | First Lien Debt Investments | Level 3 | Weighted Average | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input [7] 0.096  
Black Derman Toy | First Lien Debt Investments | Level 3 | Weighted Average | Interest Rate Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input [7] 0.30  
Broker Quotes | First Lien Debt Investments | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 67,530 [5] $ 129,827 [6]
Transactional Value | First Lien Debt Investments | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value [6]   53,238
Transactional Value | First Lien Debt Investments | Level 3 | Transaction Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value [5] 19,830  
Monte-Carlo Simulation | Equity Investments | Level 3 | Comparable Company Quotes    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 17,183 [5] $ 14,925 [6]
Investment, Measurement Input 1.8794 1.3715
Monte-Carlo Simulation | Equity Investments | Level 3 | Call Option Term    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value (in years) 4 years 4 years
Monte-Carlo Simulation | Equity Investments | Level 3 | Drift    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input 0.153 0.145
Monte-Carlo Simulation | Equity Investments | Level 3 | Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input 0.753 0.825
Monte-Carlo Simulation | Equity Investments | Level 3 | Weighted Average | Comparable Company Quotes    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input 1.8794 [7] 1.3715 [8]
Monte-Carlo Simulation | Equity Investments | Level 3 | Weighted Average | Call Option Term    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value (in years) 4 years [7] 4 years [8]
Monte-Carlo Simulation | Equity Investments | Level 3 | Weighted Average | Drift    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input 0.153 [7] 0.145 [8]
Monte-Carlo Simulation | Equity Investments | Level 3 | Weighted Average | Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input 0.753 [7] 0.825 [8]
Valuation Multiple | Equity Investments | Level 3 | LTM EBITDA    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 8,249 [5] $ 717 [6]
Valuation Multiple | Equity Investments | Level 3 | Illiquidity Discount    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input 0.10 0.10
Valuation Multiple | Equity Investments | Level 3 | Minimum | LTM EBITDA    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input 5.3 0.073
Valuation Multiple | Equity Investments | Level 3 | Maximum | LTM EBITDA    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input 12.3 0.123
Valuation Multiple | Equity Investments | Level 3 | Weighted Average | LTM EBITDA    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input 9.8 [7] 0.083 [8]
Valuation Multiple | Equity Investments | Level 3 | Weighted Average | Illiquidity Discount    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input 0.10 [7] 0.10 [8]
Recovery Analysis | First Lien Debt Investments | Level 3 | Recovery Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value [5] $ 5,322  
Recovery Analysis | Mezzanine Debt Investments | Level 3 | Recovery Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input 0.38  
Recovery Analysis | Mezzanine Debt Investments | Level 3 | Weighted Average | Recovery Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment, Measurement Input [7] 0.38  
[1] $ in thousands. Unless otherwise indicated, these investments were valued using unobservable inputs and are considered Level 3 investments. Refer to Note 5 Fair Value Measurements.
[2] Negative fair market values indicate investment had an unfunded loan commitment, and no interest is being earned on the unfunded portion, although the investment may earn unused commitment fees. Unamortized fees are classified as unearned income which reduces cost basis, which may result in a negative cost basis. A negative fair value may result from the unfunded commitment being valued below par.
[3] $ in thousands. Unless otherwise indicated, these investments were valued using unobservable inputs and are considered Level 3 investments. Refer to Note 5 Fair Value Measurements.
[4] Negative fair values indicate investment had an unfunded loan commitment, and no interest is being earned on the unfunded portion, although the investment may earn unused commitment fees. Unamortized fees are classified as unearned income which reduces cost basis, which may result in a negative cost basis. A negative fair value may result from the unfunded commitment being valued below par.
[5] $ expressed in thousands
[6] $ expressed in thousands
[7] Unobservable inputs were weighted by the relative fair value of these investments
[8] Unobservable inputs were weighted by the relative fair value of these investments