Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investment Income
Total investment income from non-controlled, non-affiliated investments	$ 1,582,094	$ 1,202,004	$ 1,021,403
Expenses
Interest expense	436,306	307,539	219,132
Management fees	191,622	188,755	178,472
Performance based incentive fees	159,857	118,091	103,968
Professional fees	15,532	14,709	15,071
Directors’ fees	1,280	1,092	1,021
Other general and administrative	11,127	9,290	9,593
Total Operating Expenses	815,724	639,476	527,257
Net Investment Income (Loss) Before Taxes	766,370	562,528	494,146
Income tax expense (benefit)	12,759	5,810	4,009
Net Investment Income (Loss) After Taxes	753,611	556,718	490,137
Net change in unrealized gain (loss):
Net change in unrealized gain (loss)	91,743	(88,427)	192,381
Translation of assets and liabilities in foreign currencies	5,808	(2,118)	(3,953)
Income tax (provision) benefit	(4,605)	(3,964)	(8,604)
Total Net Change in Unrealized Gain (Loss)	92,946	(94,509)	179,824
Net realized gain (loss):
Non-controlled, non-affiliated investments	(52,003)	5,171	(46,332)
Foreign currency transactions	(1,242)	(1,025)	1,253
Total Net Realized Gain (Loss)	(53,245)	4,146	(45,079)
Total Net Realized and Change in Unrealized Gain (Loss)	39,701	(90,363)	134,745
Net Increase (Decrease) in Net Assets Resulting from Operations	$ 793,312	$ 466,355	$ 624,882
Earnings per share, basic (in usd per share)	$ 2.03	$ 1.18	$ 1.59
Earnings per share, diluted (in usd per share)	$ 2.03	$ 1.18	$ 1.59
Weighted average shares outstanding, basic (in shares)	390,104,585	394,006,852	392,297,907
Weighted-average shares outstanding, diluted (in shares)	390,104,585	394,006,852	392,297,907
Investment income from non-controlled, non-affiliated investments:
Investment Income
Interest income	$ 1,209,536	$ 931,870	$ 887,753
Payment-in-kind (“PIK”) interest income	169,763	113,256	53,185
Dividend income	72,936	52,422	28,052
Other income	14,755	18,514	25,845
Total investment income from non-controlled, non-affiliated investments	1,466,990	1,116,062	994,835
Net change in unrealized gain (loss):
Net change in unrealized gain (loss)	90,497	(133,980)	148,300
Net realized gain (loss):
Non-controlled, non-affiliated investments	(52,003)	5,171
Non-controlled, affiliated investments
Investment Income
Dividend income	252	0	0
Other income	0
Total investment income from non-controlled, non-affiliated investments	252	0	0
Net change in unrealized gain (loss):
Net change in unrealized gain (loss)	1,033	(49)	0
Investment income from controlled, affiliated investments:
Investment Income
Interest income	20,174	8,206	5,531
Payment-in-kind (“PIK”) interest income	1,934	0	0
Dividend income	91,802	77,047	20,394
Other income	942	689	643
Total investment income from non-controlled, non-affiliated investments	114,852	85,942	26,568
Net change in unrealized gain (loss):
Net change in unrealized gain (loss)	$ 213	$ 45,602	$ 44,081