Financial Highlights (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Investment Company, Financial Highlights [Roll Forward]
Net asset value, beginning of period (in usd per share)	$ 25.93	$ 26.27
Net investment income (in usd per share)	0.93	0.61
Net unrealized and realized gain (loss) (in usd per share)	(0.06)	0.03
Net increase (decrease) in net assets resulting from operations (in usd per share)	0.87	0.64
Distributions declared (in usd per share)	(0.70)	(0.78)
Net increase (decrease) in net assets from capital share transactions (in usd per share)	0	0
Total increase (decrease) in net assets (in usd per share)	0.17	(0.14)
Net asset value, ending of period (in usd per share)	$ 26.10	$ 26.13
Common stock, shares outstanding (in shares)	160,571,371	169,691,412	160,362,861
Total return based on NAV	3.36%	2.44%
Total return based on market value	14.26%	(15.67%)
Ratios:
Ratio of net expenses to average net assets	11.69%	7.39%
Ratio of net investment income to average net assets	13.36%	9.15%
Portfolio turnover rate	1.06%	1.34%
Supplemental Data:
Total net assets	$ 4,190,496	$ 4,433,870	$ 4,158,966	$ 4,447,479
Asset coverage ratio	176.40%	178.10%	174.80%
Ratio of expenses to average net assets, before waivers	11.94%	8.23%
Ratio of expenses to average net assets, waivers	(0.25%)	(0.84%)