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Fair Value Measurements - Unobservable Inputs (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Fair Value Measurements      
Fair Value $ 3,123,450 $ 2,873,588 $ 2,387,374
Level 3      
Fair Value Measurements      
Fair Value 3,040,160 2,828,035 2,356,559
Level 3 | Transaction Price | Recent Transaction      
Fair Value Measurements      
Fair Value   $ 44,000  
Level 3 | Transaction Price | Low | Recent Transaction      
Fair Value Measurements      
Measurement input   100  
Level 3 | Transaction Price | High | Recent Transaction      
Fair Value Measurements      
Measurement input   100  
Level 3 | Transaction Price | Weighted Average | Recent Transaction      
Fair Value Measurements      
Measurement input   100  
Level 3 | First Lien Debt      
Fair Value Measurements      
Fair Value 2,907,989 $ 2,668,749 2,207,036
Level 3 | First Lien Debt | Yield Analysis | Discount Rate      
Fair Value Measurements      
Fair Value $ 2,641,353 $ 2,624,749 $ 2,207,036
Level 3 | First Lien Debt | Yield Analysis | Low | Discount Rate      
Fair Value Measurements      
Measurement input 0.0933 0.0920 0.0555
Level 3 | First Lien Debt | Yield Analysis | High | Discount Rate      
Fair Value Measurements      
Measurement input 0.1918 0.2044 0.1244
Level 3 | First Lien Debt | Yield Analysis | Weighted Average | Discount Rate      
Fair Value Measurements      
Measurement input 0.1177 0.1127 0.0752
Level 3 | First Lien Debt | Transaction Price | Recent Transaction      
Fair Value Measurements      
Fair Value $ 266,636 $ 44,000  
Level 3 | First Lien Debt | Transaction Price | Low | Recent Transaction      
Fair Value Measurements      
Measurement input 0.9650 1.0000  
Level 3 | First Lien Debt | Transaction Price | High | Recent Transaction      
Fair Value Measurements      
Measurement input 1.0000 1.0000  
Level 3 | First Lien Debt | Transaction Price | Weighted Average | Recent Transaction      
Fair Value Measurements      
Measurement input 0.9856 1.0000  
Level 3 | Second Lien Debt      
Fair Value Measurements      
Fair Value $ 92,008 $ 122,891 $ 121,550
Level 3 | Second Lien Debt | Yield Analysis | Discount Rate      
Fair Value Measurements      
Fair Value $ 87,508 $ 122,891 $ 121,550
Level 3 | Second Lien Debt | Yield Analysis | Low | Discount Rate      
Fair Value Measurements      
Measurement input 0.1147 0.1214 0.0712
Level 3 | Second Lien Debt | Yield Analysis | High | Discount Rate      
Fair Value Measurements      
Measurement input 0.2742 0.1720 0.1079
Level 3 | Second Lien Debt | Yield Analysis | Weighted Average | Discount Rate      
Fair Value Measurements      
Measurement input 0.1489 0.1424 0.0851
Level 3 | Second Lien Debt | Transaction Price | Recent Transaction      
Fair Value Measurements      
Fair Value $ 4,500    
Level 3 | Second Lien Debt | Transaction Price | Low | Recent Transaction      
Fair Value Measurements      
Measurement input 1.0000    
Level 3 | Second Lien Debt | Transaction Price | High | Recent Transaction      
Fair Value Measurements      
Measurement input 1.0000    
Level 3 | Second Lien Debt | Transaction Price | Weighted Average | Recent Transaction      
Fair Value Measurements      
Measurement input 1.0000    
Level 3 | Unsecured debt | Yield Analysis | Discount Rate      
Fair Value Measurements      
Fair Value     $ 1,350
Level 3 | Unsecured debt | Yield Analysis | Low | Discount Rate      
Fair Value Measurements      
Measurement input     0.2533
Level 3 | Unsecured debt | Yield Analysis | High | Discount Rate      
Fair Value Measurements      
Measurement input     0.2533
Level 3 | Unsecured debt | Yield Analysis | Weighted Average | Discount Rate      
Fair Value Measurements      
Measurement input     0.2533
Level 3 | Unsecured debt | Income Approach | Discount Rate      
Fair Value Measurements      
Fair Value $ 1,877 $ 1,826  
Level 3 | Unsecured debt | Income Approach | Low | Discount Rate      
Fair Value Measurements      
Measurement input 0.1450 0.1660  
Level 3 | Unsecured debt | Income Approach | High | Discount Rate      
Fair Value Measurements      
Measurement input 0.1450 0.1660  
Level 3 | Unsecured debt | Income Approach | Weighted Average | Discount Rate      
Fair Value Measurements      
Measurement input 0.1450 0.1660  
Level 3 | Unsecured debt | Market Approach | EBITDA Multiple      
Fair Value Measurements      
Fair Value $ 125 $ 372  
Level 3 | Unsecured debt | Market Approach | Low | EBITDA Multiple      
Fair Value Measurements      
Measurement input 0.0900 0.0900 0.0900
Level 3 | Unsecured debt | Market Approach | High | EBITDA Multiple      
Fair Value Measurements      
Measurement input 0.0900 0.0900 0.0900
Level 3 | Unsecured debt | Market Approach | Weighted Average | EBITDA Multiple      
Fair Value Measurements      
Measurement input 0.0900 0.0900 0.0900
Level 3 | Preferred equity | Yield Analysis | Discount Rate      
Fair Value Measurements      
Fair Value     $ 9,950
Level 3 | Preferred equity | Yield Analysis | Low | Discount Rate      
Fair Value Measurements      
Measurement input     0.1170
Level 3 | Preferred equity | Yield Analysis | High | Discount Rate      
Fair Value Measurements      
Measurement input     0.1210
Level 3 | Preferred equity | Yield Analysis | Weighted Average | Discount Rate      
Fair Value Measurements      
Measurement input     0.1192
Level 3 | Preferred equity | Income Approach | Discount Rate      
Fair Value Measurements      
Fair Value $ 18,181 $ 16,076  
Level 3 | Preferred equity | Income Approach | Low | Discount Rate      
Fair Value Measurements      
Measurement input 0.1219 0.1220  
Level 3 | Preferred equity | Income Approach | High | Discount Rate      
Fair Value Measurements      
Measurement input 0.1548 0.1569  
Level 3 | Preferred equity | Income Approach | Weighted Average | Discount Rate      
Fair Value Measurements      
Measurement input 0.1345 0.1362  
Level 3 | Preferred equity | Market Approach | Revenue Multiple      
Fair Value Measurements      
Fair Value $ 1,275 $ 963 $ 1,298
Level 3 | Preferred equity | Market Approach | Low | Revenue Multiple      
Fair Value Measurements      
Measurement input 0.0750 0.0878 0.1180
Level 3 | Preferred equity | Market Approach | High | Revenue Multiple      
Fair Value Measurements      
Measurement input 0.0750 0.0878 0.1180
Level 3 | Preferred equity | Market Approach | Weighted Average | Revenue Multiple      
Fair Value Measurements      
Measurement input 0.0750 0.0878 0.1180
Level 3 | Common equity | Market Approach | EBITDA Multiple      
Fair Value Measurements      
Fair Value $ 16,937 $ 15,877 $ 15,375
Level 3 | Common equity | Market Approach | Revenue Multiple      
Fair Value Measurements      
Fair Value $ 1,768 $ 1,281  
Level 3 | Common equity | Market Approach | Low | EBITDA Multiple      
Fair Value Measurements      
Measurement input 0.0810 0.0810 0.0810
Level 3 | Common equity | Market Approach | Low | Revenue Multiple      
Fair Value Measurements      
Measurement input 0.0720 0.1020  
Level 3 | Common equity | Market Approach | High | EBITDA Multiple      
Fair Value Measurements      
Measurement input 0.1870 0.1870 0.1997
Level 3 | Common equity | Market Approach | High | Revenue Multiple      
Fair Value Measurements      
Measurement input 0.0880 0.1020  
Level 3 | Common equity | Market Approach | Weighted Average | EBITDA Multiple      
Fair Value Measurements      
Measurement input 0.1330 0.1325 0.1311
Level 3 | Common equity | Market Approach | Weighted Average | Revenue Multiple      
Fair Value Measurements      
Measurement input 0.0824 0.1020  
Level 3 | Other Securities      
Fair Value Measurements      
Fair Value $ 40,163 $ 36,395 $ 27,973