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Consolidated Entity - ISP Fund LP (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Aug. 31, 2025	Apr. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2021	Dec. 31, 2020
CONSOLIDATED ENTITIES
Total assets			$ 1,429,106		$ 1,429,106		$ 1,301,060
ISP Fund LP
CONSOLIDATED ENTITIES
Cash distribution	$ 43,900	$ 28,000
Capital contribution								$ 300,000	$ 300,000
Economic interest of the partnership (in percent)					100.00%
Total liabilities			100		$ 100		200
Net investment-related income (expense) earned (incurred)			(400)		(1,900)	$ (300)
Investment income, interest			800		3,200
Realized gain on equity investments			11,700	$ (17,800)	(69,200)	$ (59,800)
Total assets			$ 115,700		$ 115,700		$ 255,700

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