Consolidated Statements of Changes in Net Assets - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Increase (Decrease) in Net Assets Resulting from Operations
Net investment income (loss)		$ 190,053	$ 146,774	$ 554,590	$ 394,253
Net change in unrealized gain (loss)		16,989	118,587	102,531	(123,423)
Net realized gain (loss)		(104)	66	(52,776)	3,635
Net Increase (Decrease) in Net Assets Resulting from Operations		206,938	265,427	604,345	274,465
Distributions
Distributions declared from earnings	[1]	(155,893)	(122,085)	(452,681)	(366,490)
Capital Share Transactions
Repurchase of common shares		0	0	(34,058)	(10,015)
Reinvestment of distributions		0	0	0	11,951
Net Increase (Decrease) in Net Assets Resulting from Capital Share Transactions		0	0	(34,058)	1,936
Total Increase (Decrease) in Net Assets		51,045	143,342	117,606	(90,089)
Net Assets, at beginning of period		5,948,964	5,704,446	5,882,403	5,937,877
Net Assets, at end of period		$ 6,000,009	$ 5,847,788	$ 6,000,009	$ 5,847,788

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