Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
ASSETS
Cash and cash equivalents	$ 451,280	$ 430,746
Cash segregated under federal regulations	45,122	50,947
Investments, at fair value	134,861	83,792
Accounts receivable, net of allowance of $577 and $590 as of December 31, 2023 and 2022 ,respectively	89,839	78,450
Receivables from broker-dealers, clearing organizations and customers	687,936	476,335
Goodwill	236,706	154,789
Intangible assets, net of accumulated amortization	119,108	98,065
Furniture, equipment, leasehold improvements and capitalized software, net of accumulated depreciation and amortization	102,671	100,256
Operating lease right-of-use assets	63,045	66,106
Prepaid expenses and other assets	84,499	68,289
Total assets	2,015,067	1,607,775
Liabilities
Accrued employee compensation	60,124	56,302
Payables to broker-dealers, clearing organizations and customers	537,398	303,993
Income and other tax liabilities	7,892	28,448
Accounts payable, accrued expenses and other liabilities	37,013	55,263
Operating lease liabilities	79,677	82,676
Total liabilities	722,104	526,682
Commitments and Contingencies (Note 15)
Stockholders' equity
Preferred stock	0	0
Common stock	123	123
Additional paid-in capital	333,292	345,468
Treasury stock - Common stock voting, at cost, 3,041,081 shares and 3,270,512 shares as of December 31, 2023 and 2022, respectively	(260,298)	(328,326)
Retained earnings	1,244,216	1,101,525
Accumulated other comprehensive loss	(24,370)	(37,697)
Total stockholders' equity	1,292,963	1,081,093
Total liabilities and stockholders' equity	2,015,067	1,607,775
Series A Preferred Stock [Member]
Stockholders' equity
Preferred stock	$ 0	$ 0