Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
ASSETS
Cash and cash equivalents	$ 420,497	$ 430,746
Cash segregated under federal regulations	52,601	50,947
Investments, at fair value	132,844	83,792
Accounts receivable, net of allowance of $580 and $590 as of September 30, 2023 and December 31, 2022, respectively	90,548	78,450
Receivables from broker-dealers, clearing organizations and customers	548,081	476,335
Goodwill	154,789	154,789
Intangible assets, net of accumulated amortization	84,687	98,065
Furniture, equipment, leasehold improvements and capitalized software, net of accumulated depreciation and amortization	101,654	100,256
Operating lease right-of-use assets	63,101	66,106
Prepaid expenses and other assets	88,710	68,289
Total assets	1,737,512	1,607,775
Liabilities
Accrued employee compensation	43,881	56,302
Payables to broker-dealers, clearing organizations and customers	364,086	303,993
Income and other tax liabilities	19,379	28,448
Accounts payable, accrued expenses and other liabilities	40,019	55,263
Operating lease liabilities	79,169	82,676
Total liabilities	546,534	526,682
Commitments and Contingencies (Note 13)
Stockholders' equity
Preferred stock	0	0
Common stock	123	123
Additional paid-in capital	346,947	345,468
Treasury stock - Common stock voting, at cost, 3,265,857 shares and 3,270,512 shares as of September 30, 2023 and December 31, 2022 respectively	(327,091)	(328,326)
Retained earnings	1,208,607	1,101,525
Accumulated other comprehensive loss	(37,608)	(37,697)
Total stockholders' equity	1,190,978	1,081,093
Total liabilities and stockholders' equity	1,737,512	1,607,775
Series A Preferred Stock [Member]
Stockholders' equity
Preferred stock	$ 0	$ 0