Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating Activities:
Net income	$ 48,077	$ 52,433
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization of fixed assets	8,980	7,328
Deferred income taxes	(10,583)	(2,162)
Stock-based compensation	41,177	60,438
Amortization of intangible assets	9,808	6,314
Amortization of forgivable loans	5,399	4,148
Decrease/(increase) in operating assets:
Receivables from brokers, dealers and clearing organizations	86,964	50,855
Net financial instruments and other inventory positions owned	(28,894)	(79,639)
Investments	(31,530)	(14,972)
Other assets	(12,449)	(31,197)
Increase/(decrease) in operating liabilities:
Payables to brokers, dealers and clearing organizations	(3,350)	(2,830)
Accrued compensation	(298,361)	(493,653)
Other liabilities and accrued expenses	10,129	(7,338)
Net cash used in operating activities	(174,633)	(450,275)
Investing Activities:
Business acquisitions, net of cash acquired	0	(33,044)
Purchases of fixed assets, net	(4,698)	(14,357)
Net cash used in investing activities	(4,698)	(47,401)
Financing Activities:
Payment of cash dividend	(64,132)	(89,800)
Increase in noncontrolling interests	7,275	21,959
Repurchase of common stock	(63,717)	(164,194)
Net cash used in financing activities	(120,574)	(232,035)
Currency adjustment:
Effect of exchange rate changes on cash	1,501	(3,468)
Net decrease in cash and cash equivalents	(298,404)	(733,179)
Cash and cash equivalents at beginning of period	365,624	970,965
Cash and cash equivalents at end of period	$ 67,220	$ 237,786