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		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Investment Company, Nonconsolidated Subsidiary [Line Items]
Interest and dividend receivable	$ 33,600		$ 33,600		$ 38,549
SLP III
Investment Company, Nonconsolidated Subsidiary [Line Items]
Dividend income	4,800	$ 5,600	10,560	$ 11,400
Interest and dividend receivable	4,800		4,800		5,600
SLP IV
Investment Company, Nonconsolidated Subsidiary [Line Items]
Dividend income	3,372	$ 3,794	7,166	$ 7,728
Interest and dividend receivable	$ 3,372		$ 3,372		$ 3,794