Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated net income (loss)	$ 49,041	$ 21,170
Adjustments to reconcile consolidated net income (loss) to net cash provided by (used in) operating activities:
Fixed asset depreciation and intangible asset amortization	20,636	19,059
Employee loan amortization and reserves on employee loans	14,768	13,900
Equity-based compensation and allocations of net income to limited partnership units and FPUs	96,081	81,373
Deferred compensation expense	16	11
Losses (gains) on equity method investments	(1,802)	(2,062)
Unrealized/realized losses (gains) on financial instruments owned, at fair value and other investments	(36,963)	1,325
Amortization of discount (premium) on notes payable	791	855
Impairment of fixed assets, intangible assets and investments	209	1,770
Deferred tax provision (benefit)	(602)	1,128
Change in estimated acquisition earn-out payables	(159)	674
Forfeitures of Class A common stock	(786)	(49)
Consolidated net income (loss), adjusted for non-cash and non-operating items	141,230	139,154
Decrease (increase) in operating assets:
Financial instruments owned, at fair value	(3,524)	(1,563)
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers	(1,169,259)	(1,291,324)
Accrued commissions receivable, net	(43,178)	(36,347)
Loans, forgivable loans and other receivables from employees and partners, net	(31,357)	(44,604)
Receivables from related parties	(2,226)	(2,617)
Other assets	(14,244)	(2,091)
Increase (decrease) in operating liabilities:
Accrued compensation	(37,343)	(5,297)
Payables to broker-dealers, clearing organizations, customers and related broker-dealers	1,136,863	1,270,560
Payables to related parties	40,075	(7,220)
Accounts payable, accrued and other liabilities	11,055	5,836
Net cash provided by (used in) operating activities	28,092	24,487
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of fixed assets	(3,230)	(2,327)
Capitalization of software development costs	(11,987)	(12,210)
Proceeds from equity method investments	0	1,828
Acquisition of Futures Exchange Group	0	(26,177)
Purchase of investment carried under measurement alternative	(3,699)	0
Purchase of other assets	(243)	(110)
Net cash provided by (used in) investing activities	(19,159)	(38,996)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of long-term debt and collateralized borrowings	(240,000)	(61,621)
Issuance of long-term debt and collateralized borrowings, net of deferred issuance costs	0	135,000
Issuance of short-term borrowings from related parties	275,000	0
Earnings distributions to limited partnership interests and other noncontrolling interests	(7,805)	(14,263)
Redemption and repurchase of equity awards	(48,366)	(34,454)
Dividends to stockholders	(4,847)	(3,739)
Repurchase of Class A common stock	(68,624)	(4,208)
Net cash provided by (used in) financing activities	(94,642)	16,715
Effect of exchange rate changes on Cash and cash equivalents and Cash segregated under regulatory requirements	(2,079)	5,704
Net increase (decrease) in Cash and cash equivalents, and Cash segregated under regulatory requirements	(87,788)	7,910
Cash and cash equivalents and Cash segregated under regulatory requirements at beginning of period	672,896	502,010
Cash and cash equivalents and Cash segregated under regulatory requirements at end of period	585,108	509,920
Supplemental cash information:
Cash paid during the period for taxes	17,333	9,593
Cash paid during the period for interest	5,697	14,615
Supplemental non-cash information:
Issuance of Class A common stock upon exchange of limited partnership interests	0	31,179
Issuance of Class A common stock upon exchange of contingent share obligations	3,647	0
Issuance of Class A and contingent Class A common stock and limited partnership interests for acquisitions	3,163	2,761
ROU assets and liabilities	$ 1,283	$ 1,625