Condensed Consolidated Statements of Operations - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Investment income:
Total investment income	$ 358,557,000	$ 343,218,000	$ 1,061,125,000	$ 974,242,000
Expenses:
Interest expense	94,691,000	88,191,000	279,954,000	233,752,000
Management fees (Note 3)	34,959,000	30,177,000	103,860,000	84,312,000
Income based incentive fees (Note 3)	31,254,000	38,163,000	100,273,000	111,388,000
Capital gains based incentive fees (Note 3)	0		0	264,000
Capital gains based incentive fees (Note 3)		(5,992,000)
Professional fees	1,402,000	1,297,000	3,530,000	3,317,000
Board of Trustees’ fees	282,000	286,000	881,000	797,000
Administrative service expenses (Note 3)	766,000	525,000	2,476,000	1,966,000
Other general and administrative	1,497,000	740,000	3,780,000	2,899,000
Total expenses before tax expense	164,851,000	153,387,000	494,754,000	438,695,000
Net investment income before tax expense	193,706,000	189,831,000	566,371,000	535,547,000
Excise and other tax expense	4,232,000	3,928,000	12,199,000	10,698,000
Net investment income after tax expense	189,474,000	185,903,000	554,172,000	524,849,000
Net change in unrealized appreciation (depreciation):
Net change in unrealized (appreciation) depreciation on investments			(89,206,000)	15,872,000
Derivative instruments (Note 6)	3,506,000	0	(1,541,000)	0
Translation of assets and liabilities in foreign currencies	405,000	(2,255,000)	1,125,000	(2,152,000)
Income tax (provision) benefit	(101,000)	0	(1,875,000)	0
Net change in unrealized appreciation (depreciation), net of income tax (provision) benefit	(36,323,000)	(19,130,000)	(91,497,000)	13,720,000
Net realized gain (loss):
Non-controlled/non-affiliated investments			(1,977,000)	(16,650,000)
Derivative instruments (Note 6)	(53,000)	0	(9,780,000)	0
Foreign currency transactions	(11,558,000)	2,164,000	(13,085,000)	9,686,000
Current tax expense on realized gains	167,000	0	(545,000)	0
Net realized gain (loss), net of tax expense	(20,714,000)	(15,109,000)	(25,387,000)	(6,964,000)
Net realized and change in unrealized gain (loss)	(57,037,000)	(34,239,000)	(116,884,000)	6,756,000
Net increase (decrease) in net assets resulting from operations	$ 132,437,000	$ 151,664,000	$ 437,288,000	$ 531,605,000
Net investment income, basic (in usd per share)	$ 0.82	$ 0.91	$ 2.43	$ 2.68
Net investment income, diluted (in usd per share)	0.82	0.91	2.43	2.68
Earnings (loss) per share basic (in usd per share)	0.57	0.75	1.91	2.71
Earnings (loss) per share diluted (in usd per share)	$ 0.57	$ 0.75	$ 1.91	$ 2.71
Weighted average shares outstanding basic (in shares)	230,462,792	203,419,337	228,424,998	196,003,012
Weighted average shares outstanding diluted (in shares)	230,462,792	203,419,337	228,424,998	196,003,012
Non-controlled/non-affiliated investments
Investment income:
Interest income	$ 327,649,000	$ 321,401,000	$ 984,097,000	$ 907,356,000
Payment-in-kind interest income	28,934,000	20,530,000	71,630,000	63,868,000
Dividend income	801,000	11,000	850,000	200,000
Fee income	285,000	510,000	2,509,000	1,915,000
Net change in unrealized appreciation (depreciation):
Net change in unrealized (appreciation) depreciation on investments	(39,814,000)	(16,794,000)	(88,037,000)	16,746,000
Net realized gain (loss):
Non-controlled/non-affiliated investments	(9,270,000)	(17,273,000)	(1,977,000)	(16,650,000)
Non-controlled/affiliated investments
Investment income:
Interest income	303,000	89,000	624,000	226,000
Payment-in-kind interest income	585,000	677,000	1,415,000	677,000
Net change in unrealized appreciation (depreciation):
Net change in unrealized (appreciation) depreciation on investments	$ (319,000)	$ (81,000)	$ (1,169,000)	$ (874,000)