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Subsequent Events - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended |  |
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May 01, 2023 | Apr. 28, 2023 | Apr. 04, 2023 | Feb. 15, 2023 | Nov. 03, 2022 | May 02, 2022 | Feb. 15, 2022 | Nov. 01, 2021 | Aug. 02, 2021 | May 03, 2021 | Feb. 09, 2021 | Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments at cost |  |  |  |  |  |  |  |  |  |  |  |  | $ 864,980 | [1],[2],[3] |  | $ 828,693 | [4],[5],[6] |
Investment commitment amount | [1],[2],[3],[7],[8] |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |
Proceeds from sales and repayments of investments |  |  |  |  |  |  |  |  |  |  |  |  | 15,918 |  | $ 23,185 |  |  |
Realized gain (loss) on investment |  |  |  |  |  |  |  |  |  |  |  |  | $ 58 |  | $ 6,868 |  |  |
Dividends to stockholders |  |  |  |  | $ 0.41 |  | $ 0.36 | $ 0.36 | $ 0.32 | $ 0.32 | $ 0.31 | $ 0.31 | $ 0.66 |  |  | $ 2.00 |  | $ 1.60
Dividend payable date |  |  |  |  | Mar. 29, 2023 |  | Jun. 24, 2022 | Mar. 25, 2022 | Dec. 17, 2021 | Sep. 28, 2021 | Jun. 28, 2021 | Mar. 26, 2021 |  |  |  |  |  |
Dividend record date |  |  |  |  | Mar. 22, 2023 |  | Jun. 10, 2022 | Mar. 11, 2022 | Dec. 03, 2021 | Sep. 14, 2021 | Jun. 14, 2021 | Mar. 12, 2021 |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared date |  | May 01, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend payable date |  | Jun. 28, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend record date |  | Jun. 21, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rhino Assembly Company, LLC | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment date |  |  |  | Apr. 04, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized gain (loss) on investment |  |  |  | $ 2,077 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rhino Assembly Company, LLC | Second Lien Debt | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments at cost |  |  |  | $ 14,850 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Puget Collision LLC | First Lien Debt | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment date |  |  | Apr. 28, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments at cost |  |  | $ 2,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  |  |  | $ 0.15 | $ 0.08 | $ 0.07 | $ 0.17 | $ 0.04 | $ 0.06 | $ 0.08 | $ 0.07 |  |  |  |  |  |
Dividend payable date |  |  |  |  | Mar. 29, 2023 | Dec. 16, 2022 | Jun. 24, 2022 | Mar. 25, 2022 | Dec. 17, 2021 | Sep. 28, 2021 | Jun. 28, 2021 | Mar. 26, 2021 |  |  |  |  |  |
Dividend record date |  |  |  |  | Mar. 22, 2023 | Dec. 02, 2022 | Jun. 10, 2022 | Mar. 11, 2022 | Dec. 03, 2021 | Sep. 14, 2021 | Jun. 14, 2021 | Mar. 12, 2021 |  |  |  |  |  |
Supplemental Dividend | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  | $ 0.19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special Dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  |  |  | $ 0.10 | $ 0.10 |  |  | $ 0.05 | $ 0.04 |  |  |  |  |  |  |  |
Dividend payable date |  |  |  |  |  | Dec. 16, 2022 |  |  | Dec. 17, 2021 | Sep. 28, 2021 |  |  |  |  |  |  |  |
Dividend record date |  |  |  |  | Mar. 22, 2023 | Dec. 02, 2022 |  |  | Dec. 03, 2021 | Sep. 14, 2021 |  |  |  |  |  |  |  |
Special Dividend | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  | 0.10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Dividend | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  | $ 0.41 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[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] | Investment pledged as collateral for the Credit Facility and, as a result, is not directly available to the creditors of the Company to satisfy any obligations of the Company other than the Company's obligations under the Credit Facility (see Note 6 to the consolidated financial statements).
[8] | The disclosed commitment represents the unfunded amount as of March 31, 2023. The Company is earning 0.50% interest on the unfunded balance of the commitment. The interest rate disclosed represents the rate which will be earned if the commitment is funded.

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