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Investments - Schedule of Investments Excluding Investments in Money Market Funds (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Schedule Of Investments [Line Items]    
Cost $ 3,410,976 $ 3,395,166
Fair Value 3,195,248 3,261,721
1st Lien/Senior Secured Debt    
Schedule Of Investments [Line Items]    
Cost 3,076,034 3,088,308
Fair Value 2,963,331 3,028,788
1st Lien/Last-Out Unitranche    
Schedule Of Investments [Line Items]    
Cost 140,199 138,148
Fair Value 132,155 135,156
2nd Lien/Senior Secured Debt    
Schedule Of Investments [Line Items]    
Cost 75,910 50,613
Fair Value 55,118 47,914
Unsecured Debt    
Schedule Of Investments [Line Items]    
Cost 30,231 29,603
Fair Value 8,569 8,476
Preferred Stock    
Schedule Of Investments [Line Items]    
Cost 33,209 33,101
Fair Value 20,231 26,426
Common Stock    
Schedule Of Investments [Line Items]    
Cost 53,544 53,544
Fair Value 15,437 14,714
Warrants    
Schedule Of Investments [Line Items]    
Cost 1,849 1,849
Fair Value $ 407 $ 247