v3.25.2
Fair Value Measurements - Fair Value Hierarchy of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total $ 13,252,800 $ 13,092,518
First lien debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total 13,015,201 12,830,389
Second lien debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total 122,942 119,184
Unsecured debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total 13,721 33,521
Investments in equity    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total 100,936 109,424
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total 1,430 0
Level 1 | First lien debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total 0 0
Level 1 | Second lien debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total 0 0
Level 1 | Unsecured debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total 0 0
Level 1 | Investments in equity    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total 1,430 0
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total 214,844 115,753
Level 2 | First lien debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total 214,844 115,753
Level 2 | Second lien debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total 0 0
Level 2 | Unsecured debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total 0 0
Level 2 | Investments in equity    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total 0 0
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total 13,036,526 12,976,765
Level 3 | First lien debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total 12,800,357 12,714,636
Level 3 | Second lien debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total 122,942 119,184
Level 3 | Unsecured debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total 13,721 33,521
Level 3 | Investments in equity    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total $ 99,506 $ 109,424