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v3.22.2.2

Subsequent Events - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
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Nov. 01, 2022 | Oct. 31, 2022 | Oct. 17, 2022 | Oct. 07, 2022 | Oct. 03, 2022 | May 02, 2022 | Feb. 15, 2022 | Nov. 01, 2021 | Aug. 02, 2021 | May 03, 2021 | Feb. 09, 2021 | Oct. 26, 2020 | Aug. 03, 2020 | Apr. 29, 2020 | Feb. 14, 2020 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments at cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 827,390 |  | $ 827,390 |  | $ 621,786 |
Proceeds from sales and repayments of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 128,255 | $ 319,036 |  |
Realized gain (loss) on investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 40,044 | $ 8,306 | $ 65,220 | $ 13,672 |  |
Dividends to stockholders |  |  |  |  |  | $ 0.36 | $ 0.36 | $ 0.32 | $ 0.32 | $ 0.31 | $ 0.31 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.39 | $ 1.82 |  | $ 1.82 |  | $ 1.60 | $ 1.33
Dividend payable date |  |  |  |  |  | Jun. 24, 2022 | Mar. 25, 2022 | Dec. 17, 2021 | Sep. 28, 2021 | Jun. 28, 2021 | Mar. 26, 2021 | Dec. 18, 2020 | Sep. 25, 2020 | Jun. 26, 2020 | Mar. 27, 2020 |  |  |  |  |  |
Dividend record date |  |  |  |  |  | Jun. 10, 2022 | Mar. 11, 2022 | Dec. 03, 2021 | Sep. 14, 2021 | Jun. 14, 2021 | Mar. 12, 2021 | Dec. 04, 2020 | Sep. 11, 2020 | Jun. 12, 2020 | Mar. 13, 2020 |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared date |  | Oct. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend payable date |  | Dec. 16, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend record date |  | Dec. 02, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EBL, LLC (EbLens) | Controlled Affiliate Investment | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment date |  |  |  |  | Oct. 03, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments at cost |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EBL, LLC (EbLens) | Controlled Affiliate Investment | Second Lien Debt | Maximum | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment commitment amount |  |  |  |  | $ 375 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UPG Company, LLC | First Lien Debt | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales and repayments of investments |  |  |  | $ 16,986 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OMC Investors, LLC (dba Ohio Medical Corporation) | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized gain (loss) on investment |  |  | $ 656 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OMC Investors, LLC (dba Ohio Medical Corporation) | Second Lien Debt | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales and repayments of investments |  |  | $ 5,150 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Education Incites, LLC (dba Acceleration Academies) | Second Lien Debt | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment date |  | Oct. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments at cost |  | $ 6,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  |  |  |  | $ 0.07 | $ 0.17 | $ 0.04 | $ 0.06 | $ 0.08 | $ 0.07 | $ 0.04 |  |  |  |  |  |  |  |  |
Dividend payable date |  |  |  |  |  | Jun. 24, 2022 | Mar. 25, 2022 | Dec. 17, 2021 | Sep. 28, 2021 | Jun. 28, 2021 | Mar. 26, 2021 | Dec. 18, 2020 |  |  |  |  |  |  |  |  |
Dividend record date |  |  |  |  |  | Jun. 10, 2022 | Mar. 11, 2022 | Dec. 03, 2021 | Sep. 14, 2021 | Jun. 14, 2021 | Mar. 12, 2021 | Dec. 04, 2020 |  |  |  |  |  |  |  |  |
Supplemental Dividend | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  | $ 0.08 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special Dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  |  |  |  |  |  | $ 0.05 | $ 0.04 |  |  |  |  |  |  |  |  |  |  |  |
Dividend payable date |  |  |  |  |  |  |  | Dec. 17, 2021 | Sep. 28, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Dividend record date |  |  |  |  |  |  |  | Dec. 03, 2021 | Sep. 14, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Special Dividend | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  | $ 0.10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SBA Debentures | 5.221% Fixed Interest Rate | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued amount | $ 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interim interest rate | 5.221% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument pooling month year | 2023-03 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SBA Debentures | 5.123% Fixed Interest Rate | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued amount | $ 3,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interim interest rate | 5.123% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument pooling month year | 2023-03 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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