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Fair Value Measurements - Fair Value Levels (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair Value Measurements      
Fair Value $ 3,123,450 $ 2,873,588 $ 2,387,374
Level 1      
Fair Value Measurements      
Fair Value 0 0  
Level 2      
Fair Value Measurements      
Fair Value 68,585 30,821 17,064
Level 3      
Fair Value Measurements      
Fair Value 3,040,160 2,828,035 2,356,559
Level 1, Level 2, and Level 3      
Fair Value Measurements      
Fair Value 3,108,745 2,858,856 2,373,623
Net Asset Value      
Fair Value Measurements      
Fair Value 14,705 14,732 13,751
First Lien Debt | Level 1      
Fair Value Measurements      
Fair Value 0 0  
First Lien Debt | Level 2      
Fair Value Measurements      
Fair Value 25,881 25,362 17,064
First Lien Debt | Level 3      
Fair Value Measurements      
Fair Value 2,907,989 2,668,749 2,207,036
First Lien Debt | Level 1, Level 2, and Level 3      
Fair Value Measurements      
Fair Value 2,933,870 2,694,111 2,224,100
Second Lien Debt | Level 1      
Fair Value Measurements      
Fair Value 0 0  
Second Lien Debt | Level 2      
Fair Value Measurements      
Fair Value 42,704 5,459  
Second Lien Debt | Level 3      
Fair Value Measurements      
Fair Value 92,008 122,891 121,550
Second Lien Debt | Level 1, Level 2, and Level 3      
Fair Value Measurements      
Fair Value 134,712 128,350 121,550
Other Securities | Level 1      
Fair Value Measurements      
Fair Value 0 0  
Other Securities | Level 2      
Fair Value Measurements      
Fair Value 0 0  
Other Securities | Level 3      
Fair Value Measurements      
Fair Value 40,163 36,395 27,973
Other Securities | Level 1, Level 2, and Level 3      
Fair Value Measurements      
Fair Value $ 40,163 $ 36,395 $ 27,973