Amount of operating dividend income on securities.

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Investments - Selected Balance Sheet Information and Selected Statement of Operations Information for SLP III and SLP IV (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Investment Company, Nonconsolidated Subsidiary [Line Items]
Interest and dividend receivable	$ 31,675		$ 31,675		$ 38,549
SLP III
Investment Company, Nonconsolidated Subsidiary [Line Items]
Dividend income	3,700	$ 5,600	14,260	$ 17,000
Interest and dividend receivable	3,700		3,700		5,600
SLP IV
Investment Company, Nonconsolidated Subsidiary [Line Items]
Dividend income	2,529	$ 3,794	9,695	$ 11,521
Interest and dividend receivable	$ 2,529		$ 2,529		$ 3,794