Consolidated Statements of Financial Condition (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
ASSETS
Cash and cash equivalents	$ 434,063	$ 451,280
Cash segregated under federal regulations	46,141	45,122
Investments, at fair value	135,908	134,861
Accounts receivable, net of allowance of $609 and $577 as of June 30, 2024 and December 31, 2023, respectively	92,350	89,839
Receivables from broker-dealers, clearing organizations and customers	577,992	687,936
Goodwill	236,706	236,706
Intangible assets, net of accumulated amortization	108,420	119,108
Furniture, equipment, leasehold improvements and capitalized software, net of accumulated depreciation and amortization	108,802	102,671
Operating lease right-of-use assets	60,500	63,045
Prepaid expenses and other assets	85,831	84,499
Total assets	1,886,713	2,015,067
Liabilities
Accrued employee compensation	41,002	60,124
Payables to broker-dealers, clearing organizations and customers	392,846	537,398
Securities sold, not yet purchased, at fair value	9,167	0
Income and other tax liabilities	2,058	7,892
Accounts payable, accrued expenses and other liabilities	36,338	37,013
Operating lease liabilities	76,081	79,677
Total liabilities	557,492	722,104
Commitments and Contingencies (Note 13)
Stockholders' equity
Preferred stock	0	0
Common stock	123	123
Additional paid-in capital	335,641	333,292
Treasury stock - Common stock voting, at cost, 3,248,580 shares and 3,041,081 shares as of June 30, 2024 and December 31, 2023 respectively	(302,455)	(260,298)
Retained earnings	1,325,139	1,244,216
Accumulated other comprehensive loss	(29,227)	(24,370)
Total stockholders' equity	1,329,221	1,292,963
Total liabilities and stockholders' equity	1,886,713	2,015,067
Series A Preferred Stock [Member]
Stockholders' equity
Preferred stock	$ 0	$ 0