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Portfolio Company Investments - Schedule of Investments Type With Corresponding Percentage of Total Portfolio Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 897,324 | [1],[2],[3] | $ 860,329 | [4],[5],[6],[7]
Percentage of Fair Value | 100.00% |  | 100.00% |
Investments at cost | $ 864,980 | [1],[2],[3] | $ 828,693 | [4],[5],[6]
Percentage of Cost | 100.00% |  | 100.00% |
First Lien Debt |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 481,547 |  | $ 456,105 |
Percentage of Fair Value | 53.60% |  | 53.00% |
Investments at cost | $ 478,893 |  | $ 453,585 |
Percentage of Cost | 55.40% |  | 54.70% |
Second Lien Debt |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 188,931 |  | $ 182,948 |
Percentage of Fair Value | 21.10% |  | 21.30% |
Investments at cost | $ 218,939 |  | $ 213,654 |
Percentage of Cost | 25.30% |  | 25.80% |
Subordinated Debt |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 102,386 |  | $ 101,456 |
Percentage of Fair Value | 11.40% |  | 11.80% |
Investments at cost | $ 103,130 |  | $ 100,634 |
Percentage of Cost | 11.90% |  | 12.10% |
Equity |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 122,103 |  | $ 117,741 |
Percentage of Fair Value | 13.60% |  | 13.70% |
Investments at cost | $ 61,066 |  | $ 57,868 |
Percentage of Cost | 7.10% |  | 7.00% |
Warrants |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Investments at Fair Value | $ 2,357 |  | $ 2,079 |
Percentage of Fair Value | 0.30% |  | 0.20% |
Investments at cost | $ 2,952 |  | $ 2,952 |
Percentage of Cost | 0.30% |  | 0.40% |
[1] | All debt investments are income producing, unless otherwise indicated. Equity investments are non-income producing unless otherwise noted.
[2] | Equity ownership may be held in shares or units of companies related to the portfolio companies.
[3] | See Note 3 to the consolidated financial statements for portfolio composition by geographic location.
[4] | (a) See Note 3 to the consolidated financial statements for portfolio composition by geographic location.
[5] | (b) Equity ownership may be held in shares or units of companies related to the portfolio companies.
[6] | (c) All debt investments are income producing, unless otherwise indicated. Equity investments are non-income producing unless otherwise noted.
[7] | (g) Except as otherwise noted, the Company’s investment portfolio is comprised of debt and equity securities of privately held companies for which quoted prices falling within the categories of Level 1 and Level 2 inputs are not available. Therefore, the Company values all of its portfolio investments at fair value, as determined in good faith by the board of directors, using significant unobservable Level 3 inputs.

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