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Fair Value Measurements - Fair Value Measurements of Investments and Foreign Currency Forward Contracts, by Major Class According to the Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Fair Value Measurements |  |  |  |
Investments, at fair value | $ 500,889 | [1],[2] | $ 488,386 | [3],[4]
Senior secured loans |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 404,051 |  | 388,882 |
Unitranche secured loans |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 6,091 |  | 13,877 |
Junior secured loans |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 27,427 |  | 26,594 |
Equity securities |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 30,330 |  | 25,911 |
Fair Value, Recurring |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 500,889 |  | 488,386 |
Fair Value, Recurring | Senior secured loans |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 404,051 |  | 388,882 |
Fair Value, Recurring | Unitranche secured loans |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 6,091 |  | 13,877 |
Fair Value, Recurring | Junior secured loans |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 27,427 |  | 26,594 |
Fair Value, Recurring | Equity securities |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 30,330 |  | 25,911 |
Level 1 | Fair Value, Recurring |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 1,020 |  | 257 |
Level 1 | Fair Value, Recurring | Senior secured loans |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 0 |  | 0 |
Level 1 | Fair Value, Recurring | Unitranche secured loans |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 0 |  | 0 |
Level 1 | Fair Value, Recurring | Junior secured loans |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 0 |  | 0 |
Level 1 | Fair Value, Recurring | Equity securities |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 1,020 |  | 257 |
Level 2 | Fair Value, Recurring |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 0 |  | 0 |
Level 2 | Fair Value, Recurring | Senior secured loans |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 0 |  | 0 |
Level 2 | Fair Value, Recurring | Unitranche secured loans |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 0 |  | 0 |
Level 2 | Fair Value, Recurring | Junior secured loans |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 0 |  | 0 |
Level 2 | Fair Value, Recurring | Equity securities |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 0 |  | 0 |
Level 3 | Fair Value, Recurring |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 466,879 |  | 455,007 |
Level 3 | Fair Value, Recurring | Senior secured loans |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 404,051 |  | 388,882 |
Level 3 | Fair Value, Recurring | Unitranche secured loans |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 6,091 |  | 13,877 |
Level 3 | Fair Value, Recurring | Junior secured loans |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 27,427 |  | 26,594 |
Level 3 | Fair Value, Recurring | Equity securities |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | 29,310 |  | 25,654 |
Investment measured at NAV | Fair Value, Recurring |  |  |  |
Fair Value Measurements |  |  |  |
Investments, at fair value | $ 32,990 |  | $ 33,122 |
[1] | All of the Company’s investments are issued by eligible portfolio companies, as defined in the Investment Company Act of 1940 (the “1940 Act”), unless otherwise noted. All of the Company’s investments are issued by U.S. portfolio companies unless otherwise noted.
[2] | Because there is no readily available market value for these investments, the fair value of these investments is determined in good faith using significant unobservable inputs by the Valuation Designee. (See Note 4 in the accompanying notes to the consolidated financial statements).
[3] | All of the Company's investments are issued by eligible portfolio companies, as defined in the Investment Company Act of 1940 (the “1940 Act”), unless otherwise noted. All of the Company's investments are issued by U.S. portfolio companies unless otherwise noted.
[4] | Because there is no readily available market value for these investments, the fair value of these investments is determined in good faith using significant unobservable inputs by the Valuation Designee. (See Note 4 in the accompanying notes to the consolidated financial statements.)

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