Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Investment income:
Total interest income	$ 256,880	$ 221,301	$ 123,383
Total dividend income	33,911	21,856	14,897
Total fee and other income	28,482	14,130	13,638
Total payment-in-kind interest income	11,821	10,408	5,652
Interest income from cash	1,305	222	13
Total investment income	332,399	267,917	157,583
Operating expenses:
Interest and other financing fees	88,483	87,309	37,867
Base management fee (Note 2)	19,632	16,774	11,775
Incentive management fees (Note 2)	13,173	11,192	3,074
Other general and administrative expenses (Note 2)	7,264	5,632	5,528
Total operating expenses	128,552	120,907	58,244
Net investment income before taxes	203,847	147,010	99,339
Income taxes, including excise tax expense	2,763	1,280	948
Net investment income	201,084	145,730	98,391
Net realized gains (losses):
Net realized gains (losses) on investments	(23,436)	(4,203)	(12,971)
Foreign currency transactions	2,421	3,916	3,451
Forward currency contracts	(22,447)	(11,432)	38,825
Net realized gains (losses)	(43,462)	(11,719)	29,305
Net unrealized appreciation (depreciation):
Net unrealized appreciation (depreciation) on investments	(16,165)	20,301	(30,975)
Foreign currency transactions	3,168	(7,474)	6,766
Forward currency contracts	52,327	4,959	(23,608)
Net unrealized appreciation (depreciation)	39,330	17,786	(47,817)
Net realized gains (losses) and unrealized appreciation (depreciation) on investments, foreign currency transactions and forward currency contracts	(4,132)	6,067	(18,512)
Net increase in net assets resulting from operations	$ 196,952	$ 151,797	$ 79,879
Net investment income per share—basic (in dollars per share)	$ 2.40	$ 2.49	$ 2.01
Net investment income per share— diluted (in dollars per share)	2.40	2.49	2.01
Net increase in net assets resulting from operations per share—basic and diluted (in dollars per share)	2.35	2.59	1.63
Dividends / distributions per share:
Total dividends/distributions per share, declared (in dollars per share)	2.40	2.31	1.74
Total dividends/distributions per share, paid (in dollars per share)	$ 2.40	$ 2.31	$ 1.74
Weighted average shares outstanding—basic (in shares)	83,853,880	58,615,573	49,024,108
Weighted average shares outstanding—diluted (in shares)	83,853,880	58,615,573	49,024,108
Short-term investments
Investment income:
Total interest income	$ 202	$ 0	$ 0
Non-Control / Non-Affiliate investments
Investment income:
Total dividend income	5,338	3,640	1,553
Total fee and other income	28,381	14,046	13,606
Total payment-in-kind interest income	11,640	10,231	5,652
Net realized gains (losses):
Net realized gains (losses) on investments	(23,436)	(4,203)	(12,971)
Net unrealized appreciation (depreciation):
Net unrealized appreciation (depreciation) on investments	(5,710)	18,789	(47,760)
Non-Control / Non-Affiliate investments | Long Term Investments
Investment income:
Total interest income	255,028	220,488	122,826
Affiliate investments
Investment income:
Total dividend income	28,573	18,216	13,344
Total fee and other income	101	84	32
Total payment-in-kind interest income	181	177	0
Net unrealized appreciation (depreciation):
Net unrealized appreciation (depreciation) on investments	(10,455)	1,512	16,785
Affiliate investments | Long Term Investments
Investment income:
Total interest income	1,593	813	557
Control investments | Long Term Investments
Investment income:
Total interest income	$ 57	$ 0	$ 0