Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
ASSETS
Cash and cash equivalents	$ 290,544	$ 506,735
Cash segregated under federal regulations	50,276	50,159
Investments, at fair value	34,297	36,078
Accounts receivable, net of allowance of $193 and $140 as of June 30, 2022 and December 31, 2021, respectively	87,475	63,881
Receivables from broker-dealers, clearing organizations and customers	617,817	408,346
Goodwill	154,789	154,789
Intangible assets, net of accumulated amortization	105,607	116,377
Furniture, equipment, leasehold improvements and capitalized software, net of accumulated depreciation and amortization	93,255	96,061
Operating lease right-of-use assets	68,602	70,960
Prepaid expenses and other assets	65,048	27,066
Total assets	1,567,710	1,530,452
Liabilities
Accrued employee compensation	35,685	59,719
Payables to broker-dealers, clearing organizations and customers	375,211	229,325
Income and other tax liabilities	27,660	40,456
Accounts payable, accrued expenses and other liabilities	42,797	71,218
Operating lease liabilities	85,555	88,425
Total liabilities	566,908	489,143
Commitments and Contingencies (Note 13)
Stockholders' equity
Preferred stock	0	0
Common stock	123	123
Additional paid-in capital	325,047	330,262
Treasury stock - Common stock voting, at cost, 3,270,512 shares and 2,992,550 as of June 30, 2022 and December 31, 2021, respectively	(320,252)	(232,712)
Retained earnings	1,035,723	956,966
Accumulated other comprehensive loss	(39,839)	(13,330)
Total stockholders' equity	1,000,802	1,041,309
Total liabilities and stockholders' equity	1,567,710	1,530,452
Series A Preferred Stock [Member]
Stockholders' equity
Preferred stock	$ 0	$ 0