Financial Highlights (Details) $ / shares in Units, $ in Thousands				3 Months Ended
		Jan. 20, 2023 shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares
Investment Company, Financial Highlights [Roll Forward]
Net asset value per share at beginning of period (dollars per share)				$ 20.38	$ 21.84
Net investment income per common share - basic and diluted (dollars per share)	[1]			0.63	0.54
Net unrealized appreciation (depreciation) (dollars per share)				(0.38)	(0.08)
Net realized gains (losses) (dollars per share)				(0.05)	0.16
(Provision) benefit for taxes on realized and unrealized gains (losses) (dollars per share)				0.01	0.04
Amount per share (dollars per share)			$ (0.465)	(0.96)	(0.465)
Net asset value per share at end of period (dollars per share)			22.03	19.63	22.03
Per share market value at beginning of period (dollars per share)				18.00	21.18
Per share market value at end of period (dollars per share)			$ 22.38	$ 20.61	$ 22.38
Total return				19.90%	7.92%
Common shares outstanding at beginning of period (shares) | shares				61,125,000	60,120,000
Common shares outstanding at end of period (shares) | shares			60,156,000	61,220,000	60,156,000
Net assets at beginning of period | $				$ 1,245,563	$ 1,312,823
Net assets at end of period | $			$ 1,325,061	1,201,989	1,325,061
Average net assets | $				$ 1,241,806	$ 1,327,934
Ratio of net investment income to average net assets				12.40%	9.65%
Ratio of total expenses to average net assets				13.11%	8.99%
Ratio of net expenses to average net assets				12.87%	8.77%
Ratio of portfolio turnover to average investments at fair value				4.24%	9.14%
Weighted average outstanding debt | $				$ 1,441,326	$ 1,331,141
Average debt per share (dollars per share)				$ 23.57	$ 22.14
Asset coverage ratio			200.81%	176.31%	200.81%
Subsequent Event
Investment Company, Financial Highlights [Roll Forward]
Common shares outstanding at end of period (shares) | shares		61,219,605
Stock split, conversion ratio		0.0033

[1] (1) As discussed in Note 2, the Company completed a 1-for-3 reverse stock split on January 20, 2023, effective as of the commencement of trading on January 23, 2023. The weighted average common shares outstanding and per share information reflect the reverse stock split on a retroactive basis.