Financial Highlights - Schedule of Financial Highlights (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Investment Company, Financial Highlights [Abstract]
Net Asset Value Per Share, Beginning Balance	[1]			$ 15.1	$ 16.08
Net investment income	[1],[2]			1.32	1.14
Net realized and change in unrealized gains (losses)	[1],[2]			(0.01)	(0.74)
Net increase in net assets resulting from operations	[1]			1.31	0.4
Distribution of net investment income	[1],[3]			(1.14)	(1.04)
Distribution of return of capital	[1],[3]			0	0
Accretion due to share repurchases	[1]			0.01	0.01
Net Asset Value Per Share, Ending Balance	[1]	$ 15.28	$ 15.45	15.28	15.45
Per share market value at end of period	[1]	$ 13.75	$ 10.22	$ 13.75	$ 10.22
Total return	[4]			31.95%	(12.71%)
Shares outstanding at end of period		65,253,275	65,451,359	65,253,275	65,451,359	65,253,275	65,451,359	63,518,718	63,707,845
Weighted average shares outstanding		65,253,275	64,737,122	65,356,324	63,990,220
Net assets at end of period		$ 996,845,000	$ 1,011,036,000	$ 996,845,000	$ 1,011,036,000	$ 991,677,000	$ 988,106,000	$ 985,987,000	$ 1,024,276,000
Annualized ratio of operating expenses to average net assets	[5],[6]			5.68%	5.78%
Annualized ratio of interest and other debt expenses to average net assets	[5]			10.26%	6.71%
Annualized ratio of total expenses to average net assets	[5],[6]			15.94%	12.49%
Annualized ratio of net investment income to average net assets	[5]			11.62%	9.70%
Average debt outstanding		$ 1,437,218,000	$ 1,539,332,000	$ 1,451,728,000	$ 1,587,011,000
Average debt per share				$ 22.21	$ 24.8
Annualized portfolio turnover rate	[5]			15.83%	29.60%
Asset coverage per unit	[7]			$ 1,693	$ 1,648

[1] Totals may not foot due to rounding.

[2] Financial highlights are based on the weighted average number of shares outstanding for the period presented.

[3] The tax character of distributions is determined based on taxable income calculated in accordance with income tax regulations which may differ from amounts determined under GAAP. Although the tax character of distributions paid to stockholders through September 30, 2023 may include return of capital, the exact amount cannot be determined at this point. Per share amounts are based on actual rate per share.

[4] Total return is based on the change in market price per share during the respective periods. Total return also takes into account distributions, if any, reinvested in accordance with the Company’s dividend reinvestment plan. Total return does not reflect sales load.

[5] Annualized for the nine months ended September 30, 2023 and 2022.

[6] The ratio of operating expenses to average net assets and the ratio of total expenses to average net assets are shown inclusive of all voluntary management and incentive fee waivers (See Note 3 to the financial statements). For the nine months ended September 30, 2023, the annualized ratio of operating expenses to average net assets and the annualized ratio of total expenses to average net assets would be 5.75% and 16.13%, respectively, without the voluntary fee waivers. For the nine months ended September 30, 2022, the annualized ratio of operating expenses to average net assets and the annualized ratio of total expenses to average net assets would be 5.84% and 12.60%, respectively, without the voluntary fee waivers.

[7] The asset coverage ratio for a class of senior securities representing indebtedness is calculated as our total assets, less all liabilities and indebtedness not represented by senior securities, divided by senior securities representing indebtedness. This asset coverage ratio is multiplied by one thousand to determine the asset coverage per unit. As of September 30, 2023, the Company's asset coverage was 169%.