Summary of Significant Accounting Policies - Narrative (Details) € in Thousands, £ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 AUD ($)	Sep. 30, 2025 CAD ($)	Sep. 30, 2025 EUR (€)	Sep. 30, 2025 GBP (£)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)	Dec. 31, 2024 GBP (£)
Restricted Cash and Cash Equivalent Item [Line Items]
Minimum term prior to record date fixed by board under dividend reinvestment plan			10 days
Unamortized deferred financing costs	$ 27,297		$ 27,297						$ 23,351
Amortization of debt issuance costs	2,156	$ 2,508	$ 7,298	$ 6,733
Excise tax accrued (in percent)			90.00%
Net ordinary income of deferrals and elections (in percent)			98.00%
Excess of capital gains (in percent)			98.20%
Nondeductible U.S. federal excise tax			4.00%
Net expense (benefit) for U.S. federal excise tax	63	199	$ 446	569
Payables for excise taxes	396		396						1,050
U.S. federal and state corporate-level income taxes, net tax expense	0	$ 0	28	$ 104
U.S. federal and state corporate-level income taxes, payables	0		0						0
Australia, Dollars
Restricted Cash and Cash Equivalent Item [Line Items]
Cash	397		397		$ 601
Canada, Dollars
Restricted Cash and Cash Equivalent Item [Line Items]
Cash	66		66			$ 92
Euro Member Countries, Euro
Restricted Cash and Cash Equivalent Item [Line Items]
Cash	505		505				€ 430		14	€ 14
United Kingdom, Pounds
Restricted Cash and Cash Equivalent Item [Line Items]
Cash	$ 21		$ 21					£ 16	$ 368		£ 294