Financial Highlights - Schedule of Financial Highlights (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Per Share Data:
Par Amount			$ 21.12	$ 19.88
Net investment income after tax			1.41	1.25
Net realized and unrealized gains (losses) on investments, asset acquisition and forward contracts, net of taxes			(0.99)	1.26
Net increase (decrease) in net assets resulting from operations			0.42	2.51
Distributions declared from net investment income			(1.38)	(1.23)
Total increase (decrease) in net assets			(0.96)	1.28
Par Amount	$ 20.16	$ 21.16	$ 20.16	$ 21.16
Shares outstanding, end of period	30,887,360	28,167,360	30,887,360	28,167,360
Market value, end of period	$ 15.02	$ 19.13	$ 15.02	$ 19.13
Weighted average shares outstanding (basic):	30,887,360	28,167,360	30,887,360	28,167,360
Weighted average shares outstanding (diluted):	30,887,360	28,167,360	30,887,360	28,167,360
Total return based on market value			(7.14%)	40.31%
Total return based on net asset value			1.99%	12.63%
Ratio/Supplemental Data:
Net assets, end of period	$ 622,602	$ 596,152	$ 622,602	$ 596,152
Ratio of total net expenses to average net assets			8.02%	8.01%
Ratio of net expenses (without incentive fees and interest and other debt expenses) to average net assets			3.23%	2.85%
Ratio of net investment income before taxes to average net assets			9.10%	8.43%
Ratio of interest and credit facility expenses to average net assets			4.31%	3.34%
Ratio of net incentive fees to average net assets			0.48%	1.82%
Ratio of portfolio turnover to average investments at fair value			15.98%	28.50%
Asset coverage ratio			189.00%	205.00%