Condensed Consolidated Statements of Operations - USD ($)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Investment income:
Total investment income	$ 357,764,000	$ 303,959,000
Expenses:
Interest expense	92,976,000	66,720,000
Management fees (Note 3)	34,301,000	26,040,000
Income based incentive fees payable	34,301,000	35,845,000
Capital gains based incentive fees (Note 3)	0	3,134,000
Professional fees	886,000	951,000
Board of Trustees’ fees	306,000	222,000
Administrative service expenses (Note 3)	966,000	677,000
Other general and administrative	1,063,000	1,174,000
Total expenses before tax expense	164,799,000	134,763,000
Net investment income before tax expense	192,965,000	169,196,000
Excise and other tax expense	4,169,000	3,350,000
Net investment income after tax expense	188,796,000	165,846,000
Net change in unrealized appreciation (depreciation):
Net change in unrealized (appreciation) depreciation on investments	(40,754,000)	11,787,000
Derivative instruments (Note 6)	(1,921,000)	0
Translation of assets and liabilities in foreign currencies	282,000	(21,000)
Income tax (provision) benefit	(1,481,000)	0
Net change in unrealized appreciation (depreciation)	(43,874,000)	11,766,000
Net realized gain (loss):
Non-controlled/non-affiliated investments	8,525,000	428,000
Derivative instruments (Note 6)	(2,055,000)	0
Foreign currency transactions	(987,000)	5,715,000
Current tax expense on realized gains	(596,000)	0
Net realized gain (loss)	4,887,000	6,143,000
Net realized and change in unrealized gain (loss)	(38,987,000)	17,909,000
Net increase (decrease) in net assets resulting from operations	$ 149,809,000	$ 183,755,000
Net investment income (in usd per share)	$ 0.83	$ 0.87
Earnings (loss) per share basic (in usd per share)	0.66	0.96
Earnings (loss) per share diluted (in usd per share)	$ 0.66	$ 0.96
Weighted average shares outstanding basic (in shares)	226,577,167	190,599,849
Weighted average shares outstanding diluted (in shares)	226,577,167	190,599,849
Non-controlled/non-affiliated investments
Investment income:
Interest income	$ 335,647,000	$ 283,264,000
Payment-in-kind interest income	20,818,000	20,462,000
Fee income	725,000	233,000
Net change in unrealized appreciation (depreciation):
Net change in unrealized (appreciation) depreciation on investments	(40,105,000)	11,475,000
Net realized gain (loss):
Non-controlled/non-affiliated investments	8,525,000	428,000
Non-controlled/affiliated investments
Investment income:
Interest income	39,000	0
Payment-in-kind interest income	535,000	0
Net change in unrealized appreciation (depreciation):
Net change in unrealized (appreciation) depreciation on investments	$ (649,000)	$ 312,000