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v3.25.1

INVESTMENTS - Additional Details (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 USD ($) company investment segment | Mar. 31, 2024 USD ($) investment | Dec. 31, 2024 USD ($) company investment
Schedule of Investments [Line Items] |  |  |
Purchases of portfolio investments | $ 167,244,000 | $ 143,128,000 |
Fair Value | $ 2,571,228,000 |  | $ 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 |
Number of portfolio companies | company | 9 |  | 8
Number of portfolio companies, initiated by the company | company | 7 |  | 5
Number of portfolio companies, that was on PIK non-accrual | company | 1 |  | 1
Number of operating segments | segment | 1 |  |
Number of reportable segments | segment | 1 |  |
Fair Value, Inputs, Level 3 |  |  |
Schedule of Investments [Line Items] |  |  |
Unrealized gain (loss) | $ 17,700,000 | $ 4,200,000 |
Single Portfolio Company | Percentage of Total Portfolio, at Fair Value | Portfolio Company Investment Risk |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of Total Portfolio | 5.90% |  | 6.20%
Sierra Merger |  |  |
Schedule of Investments [Line Items] |  |  |
Number of portfolio companies | company | 2 |  | 2
MVC Acquisition |  |  |
Schedule of Investments [Line Items] |  |  |
Number of portfolio companies | company |  |  | 1
New Investments |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments entered into | investment | 14 | 10 |
Purchases of portfolio investments | $ 128,200,000 | $ 63,500,000 |
Existing Portfolio |  |  |
Schedule of Investments [Line Items] |  |  |
Purchases of portfolio investments | 78,700,000 | 78,900,000 |
Equity shares |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | 434,144,000 |  | $ 409,129,000
Equity shares | Fair Value, Inputs, Level 3 |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | 429,043,000 |  | 408,475,000
Equity shares | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Fair Value, Inputs, Level 3 |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | 2,799,000 |  | $ 6,884,000
Equity shares | Market Approach | Yield Analysis |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment |  |  | 2
Fair Value |  |  | $ 20,200,000
Equity shares | Market Approach | Expected Recovery |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment |  |  | 1
Fair Value |  |  | $ 56,900
Senior debt and 1st lien notes |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | 1,819,640,000 |  | 1,686,411,000
Senior debt and 1st lien notes | Fair Value, Inputs, Level 3 |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | 1,767,792,000 |  | 1,625,501,000
Senior debt and 1st lien notes | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Fair Value, Inputs, Level 3 |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 3,680,000 |  | $ 3,840,000
Senior debt and 1st lien notes | Market Approach | Yield Analysis |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment |  |  | 1
Fair Value |  |  | $ 600,000
Senior debt and 1st lien notes | Yield Analysis | Market Approach |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment | 1 |  | 7
Fair Value | $ 2,900,000 |  | $ 31,500,000
Senior debt and 1st lien notes | Valuation, Broker Quote Analysis | Market Approach |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment | 1 |  |
Fair Value | $ 200,000 |  |
Structured products |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | 53,766,000 |  | 79,548,000
Structured products | Fair Value, Inputs, Level 3 |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | 23,504,000 |  | 48,664,000
Structured products | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Fair Value, Inputs, Level 3 |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | 20,296,000 |  | $ 12,777,000
Investment with Previous Commitment to Provide Financing |  |  |
Schedule of Investments [Line Items] |  |  |
Purchases of portfolio investments | 29,600,000 |  |
Investments with No Previous Contractual Commitment to Provide Financing |  |  |
Schedule of Investments [Line Items] |  |  |
Purchases of portfolio investments | $ 177,300,000 | 105,300,000 |
Investment, Excluding Short Term Investment, with Previous Commitment to Provide Financing |  |  |
Schedule of Investments [Line Items] |  |  |
Purchases of portfolio investments |  | $ 37,000,000 |
Investment Denominated in Canadian Dollars |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment | 1 |  | 1
Investment Denominated in Danish Kroner |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment | 1 |  | 1
Investment Denominated in Australian Dollars |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment | 10 |  | 11
Investment Denominated in New Zealand Dollars |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment | 2 |  | 2
Investment Denominated in Norwegian Krone |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment | 1 |  | 1
Investment Denominated in Swiss Francs |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment | 2 |  | 2
Investment Denominated in Swedish Krone |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment | 1 |  | 2
Investment Denominated in Euros |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment | 72 |  | 72
Investment Denominated in British Pounds Sterling |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment | 28 |  | 27
Subordinated debt and 2nd lien notes |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 159,085,000 |  | $ 165,455,000
Subordinated debt and 2nd lien notes | Fair Value, Inputs, Level 3 |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 140,472,000 |  | 153,703,000
Subordinated debt and 2nd lien notes | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Fair Value, Inputs, Level 3 |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value |  |  | $ 6,523,000
Subordinated debt and 2nd lien notes | Yield Analysis | Expected Recovery |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment |  |  | 1
Fair Value |  |  | $ 3,800,000
Subordinated debt and 2nd lien notes | Expected Recovery | Yield Analysis |  |  |
Schedule of Investments [Line Items] |  |  |
Number of investments | investment | 1 |  |
Fair Value | $ 3,800,000 |  |

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