Investment Securities and Certificates of Deposit - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Schedule Of Marketable Securities [Line Items]
Certificates of Deposit, at Carrying Value	$ 148,563		$ 148,563		$ 141,218
Certificates of Deposit
Schedule Of Marketable Securities [Line Items]
Cash and Cash Equivalents Maturity			4 months
Debt Securities [Member]
Schedule Of Marketable Securities [Line Items]
Investment Securities, Realized Gains (Losses)			$ (34)	$ (11)
Equity Securities [Member]
Schedule Of Marketable Securities [Line Items]
Investment Securities, Realized and Unrealized Gains (Losses)	(459)	$ (267)	(448)	1,860
Debt Securities Carried by EGL
Schedule Of Marketable Securities [Line Items]
Investment Securities, Realized and Unrealized Gains (Losses)	507	(4)	528	(9)
Investment Funds [Member]
Schedule Of Marketable Securities [Line Items]
Investment Securities, Realized and Unrealized Gains (Losses)	$ (26,353)	$ 9,774	$ (31,516)	$ 16,002