Consolidated Statements of Changes in Net Assets - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Partners' Capital [Abstract]
Net assets at beginning of period	$ 1,572,700	$ 1,601,825	$ 1,502,394
Increase (decrease) in net assets from operations:
Net investment income	181,567	252,553	247,241
Net realized gain (loss)	(122,610)	(153,432)	(71,371)
Net change in unrealized appreciation (depreciation)	60,390	(36,070)	20,639
(Provision) benefit for taxes on realized gain/loss on investments	(80)	(492)	(1,210)
(Provision) benefit for taxes on unrealized appreciation/depreciation on investments	0	308	575
Net increase (decrease) in net assets from operations	119,267	62,867	195,874
Distributions to stockholders from:
Distributable earnings	(216,756)	(208,488)	(197,124)
Total distributions to stockholders	(216,756)	(208,488)	(197,124)
Capital transactions:
Issuance of common stock (net of offering and underwriting costs)		109,192	97,541
Reinvestment of stockholder distributions		7,304	3,140
Repurchases of common stock (including commissions and direct acquisition costs)	(52,192)
Net increase (decrease) in net assets from capital transactions	(52,192)	116,496	100,681
Total increase (decrease) in net assets	(149,681)	(29,125)	99,431
Net assets at end of period	$ 1,423,019	$ 1,572,700	$ 1,601,825
Distributions per share	$ 1.88	$ 1.8	$ 1.8