Consolidated Statements of Changes in Net Assets - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Increase (Decrease) in Net Assets Resulting from Operations
Net investment income (loss)		$ 186,676	$ 125,124	$ 364,536	$ 247,479
Net change in unrealized gain (loss)		8,937	(159,822)	85,542	(242,009)
Net realized gain (loss)		(51)	(248)	(52,673)	3,569
Net Increase (Decrease) in Net Assets Resulting from Operations		195,562	(34,946)	397,405	9,039
Distributions
Distributions declared from earnings	[1]	(152,000)	(122,085)	(296,786)	(244,404)
Capital Share Transactions
Repurchase of common shares		(11,968)	(10,017)	(34,058)	(10,017)
Reinvestment of distributions		0	0	0	11,951
Net Increase (Decrease) in Net Assets Resulting from Capital Share Transactions		(11,968)	(10,017)	(34,058)	1,934
Total Increase (Decrease) in Net Assets		31,594	(167,048)	66,561	(233,431)
Net Assets, at beginning of period		5,917,370	5,871,494	5,882,403	5,937,877
Net Assets, at end of period		$ 5,948,964	$ 5,704,446	$ 5,948,964	$ 5,704,446

[1] (1)For the three and six months ended June 30, 2023 distributions declared from earnings were derived from net investment income. For the three and six months ended June 30, 2022 distributions declared from earnings were derived from net investment income and capital gains.