Unaudited Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Investment income:
Total interest income	$ 82,019	$ 62,747	$ 151,428	$ 123,300
Total dividend income	8,019	10,120	15,309	16,860
Total fee and other income	8,154	5,515	13,393	9,891
Total payment-in-kind interest income	3,844	3,505	7,299	5,870
Interest income from cash	657	347	1,321	607
Total investment income	102,693	82,234	188,750	156,528
Operating expenses:
Interest and other financing fees	25,783	21,127	46,698	45,280
Base management fee (Note 2)	6,164	4,824	11,886	9,417
Incentive management fees (Note 2)	4,215	3,188	8,016	6,255
Other general and administrative expenses (Note 2)	1,638	1,753	3,373	3,420
Total operating expenses	37,800	30,892	69,973	64,372
Net investment income before taxes	64,893	51,342	118,777	92,156
Income taxes, including excise tax expense	17	32	417	282
Net investment income	64,876	51,310	118,360	91,874
Net realized gains (losses):
Non-Control / Non-Affiliate investments			7,389	(11,177)
Benefit from (provision for) taxes	(982)	0	(982)	0
Net realized gains (losses) on investments	6,872	(7,618)	6,407	(11,177)
Foreign currency transactions	569	83	1,292	(314)
Forward currency contracts	(29,595)	6,609	(3,643)	(8,308)
Net realized gains (losses)	(22,154)	(926)	4,056	(19,799)
Net unrealized appreciation (depreciation):
Net unrealized appreciation (depreciation) on investments	26,108	(5,014)	45,489	(3,098)
Foreign currency transactions	(10,939)	720	(14,857)	2,570
Forward currency contracts	(4,683)	(5,036)	(44,397)	20,904
Net unrealized appreciation (depreciation)	10,486	(9,330)	(13,765)	20,376
Net realized gains (losses) and unrealized appreciation (depreciation) on investments, foreign currency transactions and forward currency contracts	(11,668)	(10,256)	(9,709)	577
Net increase in net assets resulting from operations	$ 53,208	$ 41,054	$ 108,651	$ 92,451
Net investment income per share—basic (in dollars per share)	$ 0.57	$ 0.62	$ 1.10	$ 1.19
Net investment income per share— diluted (in dollars per share)	0.57	0.62	1.10	1.19
Net increase in net assets resulting from operations per share—basic and diluted (in dollars per share)	0.47	0.50	1.02	1.20
Dividends / distributions per share:
Total dividends / distributions per share, declared (in dollars per share)	0.59	0.60	1.19	1.20
Total dividends / distributions per share, paid (in dollars per share)	$ 0.59	$ 0.60	$ 1.19	$ 1.20
Weighted average shares outstanding—basic (in shares)	114,277,070	82,893,023	107,800,035	76,947,822
Weighted average shares outstanding—diluted (in shares)	114,277,070	82,893,023	107,800,035	76,947,822
Short-term investments
Investment income:
Total interest income	$ 388	$ 111	$ 388	$ 111
Non-Control / Non-Affiliate investments
Investment income:
Total interest income	80,578	62,247	149,483	122,510
Total dividend income	1,081	1,158	1,858	2,096
Total fee and other income	8,105	5,488	13,327	9,835
Total payment-in-kind interest income	3,787	3,412	7,011	5,686
Net realized gains (losses):
Non-Control / Non-Affiliate investments	7,854	(7,618)	7,389	(11,177)
Net unrealized appreciation (depreciation):
Net unrealized appreciation (depreciation) on investments	22,756	639	40,826	3,546
Affiliate investments
Investment income:
Total interest income	512	389	1,016	679
Total dividend income	6,938	8,962	13,451	14,764
Total fee and other income	49	27	66	56
Total payment-in-kind interest income	0	93	0	184
Net unrealized appreciation (depreciation):
Net unrealized appreciation (depreciation) on investments	3,352	(5,653)	4,677	(6,644)
Control investments
Investment income:
Total payment-in-kind interest income	57	0	288	0
Net unrealized appreciation (depreciation):
Net unrealized appreciation (depreciation) on investments	0	0	(14)	0
Control investments | Long Term Investments
Investment income:
Total interest income	$ 541	$ 0	$ 541	$ 0