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Variable Interest Entities - Schedule of Supplemental Balance Sheet Disclosures (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025	Dec. 31, 2024
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 508,221	$ 382,508	$ 340,698	$ 302,154
Investments (Note 3)	2,612,683	2,266,403
Other assets	41,246	138,914
Total assets	3,763,519	3,419,182
Due to custodian	13,315	13,483
Other	825,474	670,155
Marketable equity securities
Variable Interest Entity [Line Items]
Securities sold short	135,790	115,101
Variable Interest Entity, Primary Beneficiary \| Corporate and Other
Variable Interest Entity [Line Items]
Cash and cash equivalents	88,033	87,119
Investments (Note 3)	257,029	236,340
Other assets	2,321	2,135
Total assets	347,383	325,594
Due to custodian	13,315	13,483
Other	1,424	256
Total other liabilities	106,577	88,026
Variable Interest Entity, Primary Beneficiary \| Corporate and Other \| Marketable equity securities \| Short
Variable Interest Entity [Line Items]
Securities sold short	$ 91,838	$ 74,287