Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
ASSETS
Cash and cash equivalents	$ 506,735	$ 460,858
Cash segregated under federal regulations	50,159	50,059
Investments, at fair value	36,078	28,111
Accounts receivable, net of allowance of $[[xx]] and $163 as of December 31, 2021 and 2020 ,respectively	63,881	79,577
Receivables from broker-dealers, clearing organizations and customers	408,346	279,915
Goodwill	154,789	147,388
Intangible assets, net of accumulated amortization	116,377	95,354
Furniture, equipment, leasehold improvements and capitalized software, net of accumulated depreciation and amortization	96,061	85,204
Operating lease right-of-use assets	70,960	75,924
Prepaid expenses and other assets	27,066	29,039
Total assets	1,530,452	1,331,429
Liabilities
Accrued employee compensation	59,719	62,326
Payables to broker-dealers, clearing organizations and customers	229,325	133,326
Income and other tax liabilities	40,456	42,750
Accounts payable, accrued expenses and other liabilities	71,218	44,354
Operating lease liabilities	88,425	93,612
Total liabilities	489,143	376,368
Commitments and Contingencies (Note 15)
Stockholders' equity
Preferred stock
Common stock	123	123
Additional paid-in capital	330,262	329,742
Treasury stock - Common stock voting, at cost, 2,992,550 shares and 2,845,770 shares as of December 31, 2021 and 2020, respectively	(232,712)	(169,523)
Retained earnings	956,966	799,369
Accumulated other comprehensive loss	(13,330)	(4,650)
Total stockholders' equity	1,041,309	955,061
Total liabilities and stockholders' equity	1,530,452	1,331,429
Series A Preferred Stock [Member]
Stockholders' equity
Preferred stock