Condensed Consolidated Statements of Changes in Net Assets - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Investment Company, Net Assets [Roll Forward]
Beginning balance		$ 6,076,521	$ 4,952,041
Issuance of common shares, net of offering and underwriting costs		184,830	161,998
Reinvestment of dividends	[1]	5,130	5,614
Net investment income		188,796	165,846
Net realized gain (loss)		4,887	6,143
Net change in unrealized appreciation (depreciation)		(43,874)	11,766
Dividends declared and payable from net investment income		(175,421)	(147,743)
Ending balance		6,240,869	5,155,665
Par Amount
Investment Company, Net Assets [Roll Forward]
Beginning balance		222	186
Issuance of common shares, net of offering and underwriting costs		6	6
Ending balance		228	192
Additional Paid in Capital
Investment Company, Net Assets [Roll Forward]
Beginning balance		5,749,762	4,701,827
Issuance of common shares, net of offering and underwriting costs		184,824	161,992
Reinvestment of dividends	[1]	5,130	5,614
Ending balance		5,939,716	4,869,433
Distributable Earnings (Loss)
Investment Company, Net Assets [Roll Forward]
Beginning balance		326,537	250,028
Net investment income		188,796	165,846
Net realized gain (loss)		4,887	6,143
Net change in unrealized appreciation (depreciation)		(43,874)	11,766
Dividends declared and payable from net investment income		(175,421)	(147,743)
Ending balance		$ 300,925	$ 286,040

[1] The par amount of the shares is less than 1,000 and rounds to zero.