Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
ASSETS
Cash and cash equivalents	$ 332,780	$ 430,746
Cash segregated under federal regulations	51,459	50,947
Investments, at fair value	106,674	83,792
Accounts receivable, net of allowance of $767 and $590 as of March 31, 2023 and December 31, 2022, respectively	100,184	78,450
Receivables from broker-dealers, clearing organizations and customers	558,254	476,335
Goodwill	154,789	154,789
Intangible assets, net of accumulated amortization	94,411	98,065
Furniture, equipment, leasehold improvements and capitalized software, net of accumulated depreciation and amortization	99,133	100,256
Operating lease right-of-use assets	64,904	66,106
Prepaid expenses and other assets	65,874	68,289
Total assets	1,628,462	1,607,775
Liabilities
Accrued employee compensation	24,735	56,302
Payables to broker-dealers, clearing organizations and customers	316,274	303,993
Income and other tax liabilities	37,930	28,448
Accounts payable, accrued expenses and other liabilities	46,674	55,263
Operating lease liabilities	81,317	82,676
Total liabilities	506,930	526,682
Commitments and Contingencies (Note 13)
Stockholders' equity
Preferred stock	0	0
Common stock	123	123
Additional paid-in capital	333,114	345,468
Treasury stock - Common stock voting, at cost, 3,268,584 shares and 3,270,512 shares as of March 31, 2023 and December 31, 2022, respectively	(327,815)	(328,326)
Retained earnings	1,148,093	1,101,525
Accumulated other comprehensive loss	(31,983)	(37,697)
Total stockholders' equity	1,121,532	1,081,093
Total liabilities and stockholders' equity	1,628,462	1,607,775
Series A Preferred Stock [Member]
Stockholders' equity
Preferred stock	$ 0	$ 0