Unaudited Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Investment income:
Total interest income	$ 89,259	$ 65,545	$ 240,685	$ 188,845
Total dividend income	12,146	8,055	27,455	24,915
Total fee and other income	7,419	5,943	20,812	15,834
Total payment-in-kind interest income	5,184	3,266	12,484	9,136
Interest income from cash	431	540	1,753	1,147
Total investment income	114,439	83,349	303,189	239,877
Operating expenses:
Interest and other financing fees	31,363	20,979	78,061	66,259
Base management fee (Note 2)	6,927	4,972	18,813	14,389
Incentive management fees (Note 2)	4,642	3,355	12,658	9,610
Other general and administrative expenses (Note 2)	1,844	1,825	5,217	5,245
Total operating expenses	44,776	31,131	114,749	95,503
Net investment income before taxes	69,663	52,218	188,440	144,374
Income taxes, including excise tax expense	0	253	417	535
Net investment income	69,663	51,965	188,023	143,839
Net realized gains (losses):
Non-Control / Non-Affiliate investments and Affiliate investments			11,506	(13,063)
Benefit from (provision for) taxes	0	0	(982)	0
Net realized gains (losses) on investments	4,116	(1,886)	10,524	(13,063)
Foreign currency transactions	(406)	2,303	885	1,988
Forward currency contracts	(8,615)	(3,338)	(12,258)	(11,645)
Net realized gains (losses)	(4,905)	(2,921)	(849)	(22,720)
Net unrealized appreciation (depreciation):
Net unrealized appreciation (depreciation) on investments	(20,669)	17,679	24,819	14,581
Foreign currency transactions	430	(6,023)	(14,426)	(3,453)
Forward currency contracts	14,360	(14,110)	(30,037)	6,794
Net unrealized appreciation (depreciation)	(5,879)	(2,454)	(19,644)	17,922
Net realized gains (losses) and unrealized appreciation (depreciation) on investments, foreign currency transactions and forward currency contracts	(10,784)	(5,375)	(20,493)	(4,798)
Benefit from (provision for) taxes	54	0	54	0
Net increase in net assets resulting from operations	$ 58,933	$ 46,590	$ 167,584	$ 139,041
Net investment income per share—basic (in dollars per share)	$ 0.56	$ 0.59	$ 1.66	$ 1.78
Net investment income per share— diluted (in dollars per share)	0.56	0.59	1.66	1.78
Net increase in net assets resulting from operations per share—basic and diluted (in dollars per share)	0.47	0.53	1.49	1.72
Dividends / distributions per share:
Total dividends / distributions per share, declared (in dollars per share)	0.57	0.60	1.76	1.80
Total dividends / distributions per share, paid (in dollars per share)	$ 0.57	$ 0.60	$ 1.76	$ 1.80
Weighted average shares outstanding—basic (in shares)	124,914,158	88,176,666	113,567,432	80,718,091
Weighted average shares outstanding—diluted (in shares)	124,914,158	88,176,666	113,567,432	80,718,091
Short-term investments
Investment income:
Total interest income	$ 114	$ 91	$ 501	$ 201
Non-Control / Non-Affiliate investments
Investment income:
Total interest income	88,191	65,070	237,674	187,581
Total dividend income	5,484	1,099	7,342	3,195
Total fee and other income	7,409	5,913	20,736	15,748
Total payment-in-kind interest income	5,036	3,169	12,048	8,855
Net realized gains (losses):
Non-Control / Non-Affiliate investments and Affiliate investments	4,113	(1,886)	11,503	(13,063)
Net unrealized appreciation (depreciation):
Net unrealized appreciation (depreciation) on investments	(21,321)	19,498	19,504	23,043
Affiliate investments
Investment income:
Total interest income	299	384	1,315	1,063
Total dividend income	6,662	6,956	20,113	21,720
Total fee and other income	10	30	76	86
Total payment-in-kind interest income	148	97	148	281
Net realized gains (losses):
Non-Control / Non-Affiliate investments and Affiliate investments	3	0	3	0
Net unrealized appreciation (depreciation):
Net unrealized appreciation (depreciation) on investments	652	(1,819)	5,329	(8,462)
Control investments
Investment income:
Total payment-in-kind interest income	0	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	$ 655	$ 0	$ 1,195	$ 0