Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Unobservable Inputs (Details)

v3.23.1
Fair Value Measurements - Unobservable Inputs (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 6,653,479 $ 5,716,521
Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 5,796,765 4,895,099
Amount excluded from measurement input 805,311 1,043,296
First lien debt    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 6,558,981 5,614,718
First lien debt | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 5,774,333 4,882,393
First lien debt | Valuation, Market Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 4,978,384 $ 3,848,793
First lien debt | Valuation, Market Approach | Minimum | Measurement Input, Discount Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 8.41% 8.14%
First lien debt | Valuation, Market Approach | Maximum | Measurement Input, Discount Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 18.32% 17.70%
First lien debt | Valuation, Market Approach | Weighted Average | Measurement Input, Discount Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 11.88% 11.47%
Second lien debt    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 46,315 $ 45,248
Second lien debt | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 18,048 8,794
Second lien debt | Valuation, Market Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 8,686  
Second lien debt | Valuation, Market Approach | Minimum | Measurement Input, Discount Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 13.90%  
Second lien debt | Valuation, Market Approach | Maximum | Measurement Input, Discount Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 13.90%  
Second lien debt | Valuation, Market Approach | Weighted Average | Measurement Input, Discount Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 13.90%  
Unsecured debt    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 16,890 25,512
Unsecured debt | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 1,915 1,606
Unsecured debt | Valuation, Market Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 1,915 $ 704
Unsecured debt | Valuation, Market Approach | Minimum | Measurement Input, Discount Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 13.43% 14.70%
Unsecured debt | Valuation, Market Approach | Maximum | Measurement Input, Discount Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 15.28% 14.70%
Unsecured debt | Valuation, Market Approach | Weighted Average | Measurement Input, Discount Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 14.32% 14.70%
Preferred equity | Valuation, Market Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 2,160  
Preferred equity | Valuation, Market Approach | Minimum | Measurement Input, Discount Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 8.28%  
Preferred equity | Valuation, Market Approach | Maximum | Measurement Input, Discount Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 17.79%  
Preferred equity | Valuation, Market Approach | Weighted Average | Measurement Input, Discount Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 13.07%  
Common equity | Valuation Technique, Discounted Cash Flow | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 309  
Common equity | Valuation Technique, Discounted Cash Flow | Minimum | Measurement Input, Discount Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 7.50%  
Common equity | Valuation Technique, Discounted Cash Flow | Minimum | Measurement Input, Exit Multiple | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 10.00%  
Common equity | Valuation Technique, Discounted Cash Flow | Minimum | Measurement Input, Cap Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 5.25%  
Common equity | Valuation Technique, Discounted Cash Flow | Maximum | Measurement Input, Discount Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 15.00%  
Common equity | Valuation Technique, Discounted Cash Flow | Maximum | Measurement Input, Exit Multiple | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 10.00%  
Common equity | Valuation Technique, Discounted Cash Flow | Maximum | Measurement Input, Cap Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 5.25%  
Common equity | Valuation Technique, Discounted Cash Flow | Weighted Average | Measurement Input, Discount Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 11.96%  
Common equity | Valuation Technique, Discounted Cash Flow | Weighted Average | Measurement Input, Exit Multiple | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 10.00%  
Common equity | Valuation Technique, Discounted Cash Flow | Weighted Average | Measurement Input, Cap Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 5.25%  
Equity investments    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 2,469 $ 2,306
Equity investments | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 2,469 2,306
Equity investments | Valuation, Market Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value   $ 2,108
Equity investments | Valuation, Market Approach | Minimum | Measurement Input, Discount Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input   7.08%
Equity investments | Valuation, Market Approach | Maximum | Measurement Input, Discount Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input   16.95%
Equity investments | Valuation, Market Approach | Weighted Average | Measurement Input, Discount Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input   11.96%
Equity investments | Valuation Technique, Discounted Cash Flow | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value   $ 198
Equity investments | Valuation Technique, Discounted Cash Flow | Minimum | Measurement Input, Discount Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input   15.00%
Equity investments | Valuation Technique, Discounted Cash Flow | Minimum | Measurement Input, Exit Multiple | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input   1000.00%
Equity investments | Valuation Technique, Discounted Cash Flow | Maximum | Measurement Input, Discount Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input   15.00%
Equity investments | Valuation Technique, Discounted Cash Flow | Maximum | Measurement Input, Exit Multiple | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input   1000.00%
Equity investments | Valuation Technique, Discounted Cash Flow | Weighted Average | Measurement Input, Discount Rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input   15.00%
Equity investments | Valuation Technique, Discounted Cash Flow | Weighted Average | Measurement Input, Exit Multiple | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input   1000.00%