Consolidated Entities - ISP Fund LP (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Mar. 30, 2022	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	May 31, 2021	Dec. 31, 2020
CONSOLIDATED ENTITIES
Total assets		$ 1,137,639		$ 1,137,639		$ 926,395
Changes in fair values of equity and long-term investments		(58,600)	$ 45,315	$ (68,011)	$ 100,360
ISP Fund LP
CONSOLIDATED ENTITIES
Contributed to partnership for investing								$ 300,000
Distribution from partnership							$ 110,000
Economic interest of the Partnership (in percent)				100.00%
Total assets		306,900		$ 306,900		195,800
Total liabilities		6,400		6,400		$ 200
Investment-related expenses, net of investment-related income		500	900	700	1,300
Changes in fair values of equity and long-term investments		$ (6,500)	$ 25,200	$ (4,400)	$ 31,000
Commitment for future contribution	$ 110,000
Lock-up period	36 months