Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Tax Credit Carryforward [Line Items]
Excise taxes	$ 2,600	$ 1,300
Accumulated capital gains (losses)	21,955	633	$ 0
Cost of investments, income tax purposes	3,150,700	2,446,200
Unrealized (depreciation) appreciation	(21,200)	(5,600)
Unrealized gross appreciation	93,700	93,800
Unrealized gross depreciation	114,900	99,400
Deferred tax liabilities	2,400	700
Short-Term Capital Loss Carryforward
Tax Credit Carryforward [Line Items]
Accumulated capital gains (losses)	4,900	$ 600
Long-Term Capital Loss Carryforward
Tax Credit Carryforward [Line Items]
Accumulated capital gains (losses)	$ 17,100