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v3.25.2

INVESTMENTS - Valuation Inputs (Details) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2025 USD ($) investment | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) investment
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 2,623,882,000 |  | $ 2,449,272,000
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net unrealized appreciation (depreciation) on investments | Net unrealized appreciation (depreciation) on investments |
Purchases of portfolio investments | $ 409,178,000 | $ 216,878,000 |
Fair Value, Inputs, Level 3 |  |  |
Schedule of Investments [Line Items] |  |  |
Unrealized gain (loss) | 34,000,000 | (20,700,000) |
Senior debt and 1st lien notes |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | 1,851,109,000 |  | 1,686,411,000
Senior debt and 1st lien notes | Fair Value, Inputs, Level 3 |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | 1,795,252,000 |  | 1,625,501,000
Subordinated debt and 2nd lien notes |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | 192,468,000 |  | 165,455,000
Subordinated debt and 2nd lien notes | Fair Value, Inputs, Level 3 |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | 184,616,000 |  | 153,703,000
Equity shares |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | 440,536,000 |  | 409,129,000
Equity shares | Fair Value, Inputs, Level 3 |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | 439,652,000 |  | $ 408,475,000
Investments with No Previous Contractual Commitment to Provide Financing |  |  |
Schedule of Investments [Line Items] |  |  |
Purchases of portfolio investments | 355,300,000 | 164,800,000 |
Investment with Previous Commitment to Provide Financing |  |  |
Schedule of Investments [Line Items] |  |  |
Purchases of portfolio investments | $ 50,700,000 |  |
Investment, Excluding Short Term Investment, with Previous Commitment to Provide Financing |  |  |
Schedule of Investments [Line Items] |  |  |
Purchases of portfolio investments |  | $ 56,100,000 |
Yield Analysis | Senior debt and 1st lien notes | Market Approach |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment | 3 |  | 7
Fair Value | $ 25,800,000 |  | $ 31,500,000
Yield Analysis | Subordinated debt and 2nd lien notes | Expected Recovery |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment |  |  | 1
Fair Value |  |  | $ 3,800,000
Valuation, Broker Quote Analysis | Senior debt and 1st lien notes | Market Approach |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment | 1 |  |
Fair Value | $ 100,000 |  |
Market Approach | Senior debt and 1st lien notes | Yield Analysis |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment | 1 |  | 1
Fair Value | $ 4,100,000 |  | $ 600,000
Market Approach | Equity shares | Yield Analysis |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment |  |  | 2
Fair Value |  |  | $ 20,200,000
Market Approach | Equity shares | Expected Recovery |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment |  |  | 1
Fair Value |  |  | $ 56,900

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