Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
ASSETS
Cash and cash equivalents	$ 318,699	$ 506,735
Cash segregated under federal regulations	50,523	50,159
Investments, at fair value	33,294	36,078
Accounts receivable, net of allowance of $387 and $140 as of September 30, 2022 and December 31, 2021, respectively	87,550	63,881
Receivables from broker-dealers, clearing organizations and customers	584,654	408,346
Goodwill	154,789	154,789
Intangible assets, net of accumulated amortization	99,887	116,377
Furniture, equipment, leasehold improvements and capitalized software, net of accumulated depreciation and amortization	93,512	96,061
Operating lease right-of-use assets	66,662	70,960
Prepaid expenses and other assets	70,177	27,066
Total assets	1,559,747	1,530,452
Liabilities
Accrued employee compensation	45,217	59,719
Payables to broker-dealers, clearing organizations and customers	336,885	229,325
Income and other tax liabilities	28,257	40,456
Accounts payable, accrued expenses and other liabilities	47,362	71,218
Operating lease liabilities	83,286	88,425
Total liabilities	541,007	489,143
Commitments and Contingencies (Note 13)
Stockholders' equity
Preferred stock	0	0
Common stock	123	123
Additional paid-in capital	330,294	330,262
Treasury stock - Common stock voting, at cost, 3,270,512 shares and 2,992,550 as of September 30, 2022 and December 31, 2021, respectively	(320,252)	(232,712)
Retained earnings	1,068,662	956,966
Accumulated other comprehensive loss	(60,087)	(13,330)
Total stockholders' equity	1,018,740	1,041,309
Total liabilities and stockholders' equity	1,559,747	1,530,452
Series A Preferred Stock [Member]
Stockholders' equity
Preferred stock	$ 0	$ 0