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Subsequent Events - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands																3 Months Ended		9 Months Ended
	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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