Condensed Consolidated Statements of Changes in Net Assets - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2025		Sep. 30, 2024		Sep. 30, 2025		Sep. 30, 2024
Investment Company, Net Assets [Roll Forward]
Beginning balance	$ 6,288,296		$ 5,394,573		$ 6,076,521		$ 4,952,041
Issuance of Common Shares, net of offering and underwriting costs	21,206		310,268		270,048		662,401
Reinvestment of dividends	5,474	[1]	5,074	[2]	15,984	[1]	15,981	[2]
Net investment income after tax expense	189,474		185,903		554,172		524,849
Net change in unrealized appreciation (depreciation), net of income tax (provision) benefit	(36,323)		(19,130)		(91,497)		13,720
Net realized gain (loss), net of tax expense	(20,714)		(15,109)		(25,387)		(6,964)
Dividends declared and payable from net investment income	(177,837)		(160,912)		(530,265)		(461,361)
Ending balance	6,269,576		5,700,667		6,269,576		5,700,667
Par Amount
Investment Company, Net Assets [Roll Forward]
Beginning balance	230		198		222		186
Issuance of Common Shares, net of offering and underwriting costs	1		11		9		23
Ending balance	231		209		231		209
Additional Paid in Capital
Investment Company, Net Assets [Roll Forward]
Beginning balance	6,009,106		5,064,855		5,749,762		4,701,827
Issuance of Common Shares, net of offering and underwriting costs	21,205		310,257		270,039		662,378
Reinvestment of dividends	5,474	[1]	5,074	[2]	15,984	[1]	15,981	[2]
Ending balance	6,035,785		5,380,186		6,035,785		5,380,186
Distributable Earnings (Loss)
Investment Company, Net Assets [Roll Forward]
Beginning balance	278,960		329,520		326,537		250,028
Net investment income after tax expense	189,474		185,903		554,172		524,849
Net change in unrealized appreciation (depreciation), net of income tax (provision) benefit	(36,323)		(19,130)		(91,497)		13,720
Net realized gain (loss), net of tax expense	(20,714)		(15,109)		(25,387)		(6,964)
Dividends declared and payable from net investment income	(177,837)		(160,912)		(530,265)		(461,361)
Ending balance	$ 233,560		$ 320,272		$ 233,560		$ 320,272

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

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