Consolidated Statements of Financial Condition (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
ASSETS
Cash and cash equivalents	$ 462,837	$ 544,478
Cash segregated under federal regulations	47,930	47,107
Investments, at fair value	169,349	165,260
Accounts receivable, net of allowance of $522 and $982 as of June 30, 2025 and December 31, 2024, respectively	113,242	91,845
Receivables from broker-dealers, clearing organizations and customers	559,120	357,728
Goodwill	286,020	236,706
Intangible assets, net of accumulated amortization	121,397	98,078
Furniture, equipment, leasehold improvements and capitalized software, net of accumulated depreciation and amortization	109,206	107,298
Operating lease right-of-use assets	55,382	58,132
Prepaid expenses and other assets	50,455	82,584
Total assets	1,974,938	1,789,216
Liabilities
Accrued employee compensation	48,198	68,054
Payables to broker-dealers, clearing organizations and customers	329,785	218,845
Income and other tax liabilities	95,197	3,683
Accounts payable, accrued expenses and other liabilities	31,628	37,320
Operating lease liabilities	69,230	72,654
Total liabilities	574,038	400,556
Commitments and Contingencies (Note 13)
Redeemable noncontrolling interest	14,715	0
Stockholders' equity
Preferred stock	0	0
Common stock	123	123
Additional paid-in capital	356,817	350,701
Treasury stock - Common stock voting, at cost, 3,724,037 shares and 3,374,047 shares as of June 30, 2025 and December 31, 2024, respectively	(407,029)	(333,369)
Retained earnings	1,434,953	1,405,904
Accumulated other comprehensive income/(loss)	1,321	(34,699)
Total stockholders' equity	1,386,185	1,388,660
Total liabilities, redeemable noncontrolling interest and stockholder's equity	1,974,938	1,789,216
Series A Preferred Stock [Member]
Stockholders' equity
Preferred stock	$ 0	$ 0