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Investments - Schedule of Investments Excluding Investments in Money Market Funds (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Schedule Of Investments [Line Items] |  |
Cost | $ 3,403,111 | $ 3,395,166
Fair Value | 3,228,940 | 3,261,721
1st Lien/Senior Secured Debt |  |
Schedule Of Investments [Line Items] |  |
Cost | 3,096,064 | 3,088,308
Fair Value | 3,002,029 | 3,028,788
1st Lien/Last-Out Unitranche |  |
Schedule Of Investments [Line Items] |  |
Cost | 137,070 | 138,148
Fair Value | 130,886 | 135,156
2nd Lien/Senior Secured Debt |  |
Schedule Of Investments [Line Items] |  |
Cost | 51,353 | 50,613
Fair Value | 52,766 | 47,914
Unsecured Debt |  |
Schedule Of Investments [Line Items] |  |
Cost | 30,022 | 29,603
Fair Value | 8,521 | 8,476
Preferred Stock |  |
Schedule Of Investments [Line Items] |  |
Cost | 33,209 | 33,101
Fair Value | 20,124 | 26,426
Common Stock |  |
Schedule Of Investments [Line Items] |  |
Cost | 53,544 | 53,544
Fair Value | 14,153 | 14,714
Warrants |  |
Schedule Of Investments [Line Items] |  |
Cost | 1,849 | 1,849
Fair Value | $ 461 | $ 247

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