Consolidated Statements of Changes in Net Assets - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Investment Company, Net Assets [Roll Forward]
Net assets at the beginning of period	$ 1,721,151	$ 1,397,305	$ 1,188,587
Increase (decrease) in net assets resulting from operations:
Net investment income (loss)	220,235	198,061	128,010
Net realized gain (loss)	(16,467)	118	537
Net change in unrealized appreciation (depreciation)	11,796	32,835	(80,005)
Net increase (decrease) in net assets resulting from operations	215,564	231,014	48,542
Distributions to stockholders from:
Distributable earnings	(195,729)	(169,291)	(119,437)
Total distributions to stockholders	(195,729)	(169,291)	(119,437)
Capital transactions:
Issuance of common stock, net of underwriting and offering costs	95,847	220,238	249,291
Reinvestment of dividends	23,385	41,885	30,322
Repurchase of common stock	(18,062)	0	0
Net increase (decrease) in net assets resulting from capital transactions	101,170	262,123	279,613
Total increase (decrease) in net assets	121,005	323,846	208,718
Net assets at end of period	$ 1,842,156	$ 1,721,151	$ 1,397,305
Dividends per share (in dollars per share)	$ 2.20	$ 2.27	$ 1.92