Consolidated Statements of Financial Condition (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
ASSETS
Cash and cash equivalents	$ 473,299	$ 544,478
Cash segregated under federal regulations	48,351	47,107
Investments, at fair value	168,472	165,260
Accounts receivable, net of allowance of $303 and $982 as of September 30, 2025 and December 31, 2024, respectively	110,519	91,845
Receivables from broker-dealers, clearing organizations and customers	606,667	357,728
Goodwill	283,667	236,706
Intangible assets, net of accumulated amortization	115,880	98,078
Furniture, equipment, leasehold improvements and capitalized software, net of accumulated depreciation and amortization	111,622	107,298
Operating lease right-of-use assets	53,412	58,132
Prepaid expenses and other assets	42,019	82,584
Total assets	2,013,908	1,789,216
Liabilities
Accrued employee compensation	60,374	68,054
Payables to broker-dealers, clearing organizations and customers	365,828	218,845
Income and other tax liabilities	98,744	3,683
Accounts payable, accrued expenses and other liabilities	31,907	37,320
Operating lease liabilities	66,872	72,654
Total liabilities	623,725	400,556
Commitments and Contingencies (Note 13)
Redeemable noncontrolling interest	11,733	0
Stockholders' equity
Preferred stock	0	0
Common stock	123	123
Additional paid-in capital	358,607	350,701
Treasury stock - Common stock voting, at cost, 3,958,418 shares and 3,374,047 shares as of September 30, 2025 and December 31, 2024, respectively	(451,403)	(333,369)
Retained earnings	1,474,752	1,405,904
Accumulated other comprehensive income/(loss)	(3,629)	(34,699)
Total stockholders' equity	1,378,450	1,388,660
Total liabilities, redeemable noncontrolling interest and stockholders' equity	2,013,908	1,789,216
Series A Preferred Stock [Member]
Stockholders' equity
Preferred stock	$ 0	$ 0