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Subsequent Events - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands

Oct. 31, 2023

Oct. 30, 2023

Aug. 01, 2023

May 02, 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

Nov. 01, 2023

Oct. 26, 2023

Oct. 11, 2023

Sep. 30, 2023

Dec. 31, 2022

Dec. 31, 2021

Subsequent Event [Line Items]

Investments at cost

$ 895,362

^[1],[2],[3]

$ 828,693

^[4],[5],[6]

Dividends to stockholders

$ 0.41

$ 0.41

$ 0.41

$ 0.36

$ 0.36

$ 0.32

$ 0.32

$ 0.31

$ 0.31

$ 2.08

$ 2

$ 1.6

Dividend payable date

Sep. 27, 2023

Jun. 28, 2023

Mar. 29, 2023

Jun. 24, 2022

Mar. 25, 2022

Dec. 17, 2021

Sep. 28, 2021

Jun. 28, 2021

Mar. 26, 2021

Dividend record date

Sep. 20, 2023

Jun. 21, 2023

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

Oct. 30, 2023

Dividend payable date

Dec. 27, 2023

Dividend record date

Dec. 20, 2023

Subsequent Events | SBA Debentures | 6.083% Fixed Interest Rate

Subsequent Event [Line Items]

Debt instrument issued amount

$ 3,000

Debt instrument interim interest rate

6.083%

First Lien Debt and Preferred Equity | Subsequent Events

Subsequent Event [Line Items]

Investments at cost

$ 13,750

Investment acquisition date

Oct. 31, 2023

First Lien Debt

Subsequent Event [Line Items]

Investments at cost

$ 521,345

$ 453,585

Second Lien Debt

Subsequent Event [Line Items]

Investments at cost

$ 182,245

$ 213,654

White Label Communications, LLC | First Lien Debt and Preferred Equity | Subsequent Events

Subsequent Event [Line Items]

Investments at cost

$ 18,000

GP&C Operations, LLC | First Lien Debt | Subsequent Events

Subsequent Event [Line Items]

Investments at cost

$ 10,838

Power Grid Components, Inc | Second Lien Debt | Subsequent Events

Subsequent Event [Line Items]

Investments at cost

$ 10,269

Combined Systems, Inc | First Lien Debt | Subsequent Events

Subsequent Event [Line Items]

Investments at cost

$ 8,228

Quarterly Dividend | Subsequent Events

Subsequent Event [Line Items]

Dividends to stockholders

$ 0.43

Supplemental Dividend

Subsequent Event [Line Items]

Dividends to stockholders

$ 0.21

$ 0.19

$ 0.15

$ 0.08

$ 0.07

$ 0.17

$ 0.04

$ 0.06

$ 0.08

$ 0.07

Dividend payable date

Sep. 27, 2023

Jun. 28, 2023

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

Sep. 20, 2023

Jun. 21, 2023

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

0.27

Special Dividend

Subsequent Event [Line Items]

Dividends to stockholders

$ 0.1

$ 0.1

$ 0.1

$ 0.1

$ 0.05

$ 0.04

Dividend payable date

Sep. 27, 2023

Jun. 28, 2023

Dec. 16, 2022

Dec. 17, 2021

Sep. 28, 2021

Dividend record date

Sep. 20, 2023

Jun. 21, 2023

Mar. 22, 2023

Dec. 02, 2022

Dec. 03, 2021

Sep. 14, 2021

Special Dividend | Subsequent Events

Subsequent Event [Line Items]

Dividends to stockholders

$ 0.1

[1]	(a) See Note 3 to the consolidated financial statements for portfolio composition by geographic location.
[2]	(b) Equity ownership may be held in shares or units of companies related to the portfolio companies.
[3]	(c) All debt investments are income producing, unless otherwise indicated. Equity investments are non-income producing unless otherwise noted.
[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.

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