NET ASSETS - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Net increase (decrease) in net assets resulting from operations	$ 108,968	$ 103,676	$ 108,135
Weighted-average shares outstanding
Weighted-average shares outstanding, basic (in shares)	81,573,132	59,200,911	56,551,480	57,991,971	50,982,223	44,300,431	23,431,444	7,907,949	1,421,700
Weighted-average shares outstanding, diluted (in shares)	81,573,132	59,200,911	56,551,480
Basic and diluted earnings per Class I share
Basic earnings per share (in dollars per share)	$ 1.34	$ 1.75	$ 1.91
Diluted earnings per share (in dollars per share)	$ 1.34	$ 1.75	$ 1.91