Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net income (loss)	$ 55,147	$ 152,066
Adjustments to reconcile net income (loss) to net cash provided by / (used in) operating activities:
Bargain purchase gain, net of tax	0	(3,855)
Depreciation and amortization	7,185	4,354
Amortization of debt issuance costs	604	480
Amortization of debt discount (premium)	77	776
Noncash lease expense	(858)	(362)
(Gain) / loss on extinguishment of debt	0	3,890
Share-based awards	24,612	19,037
Change in deferred taxes	2,157	5,913
Gain (Loss) on Disposition of Property Plant Equipment	101	0
Contingent liability adjustment	0	(614)
Payments to Acquire Marketable Securities	(269,037)	(269,073)
Proceeds from sales of securities owned, at fair value	243,634	271,314
Proceeds from sales of securities sold, not yet purchased, at fair value	131,199	63,511
Payments to cover securities sold, not yet purchased, at fair value	(141,186)	(58,346)
Proceeds from sales of other investments	16,780	16,995
Investment income (loss) principal transactions, net	(22,115)	(158,833)
Consolidated Funds
Proceeds from sales of securities owned, at fair value	0	2,687
Proceeds from other investments	0	14,130
Investment Income (loss) principal transactions, net	1,886	3,143
(Increase) decrease in operating assets:
Securities owned, at fair value, held at broker-dealer	(46,185)	(1,112,154)
Receivable on derivative contracts, at fair value	(56,577)	(44,054)
Securities borrowed	(56,543)	(88,570)
Deposits with clearing organizations, brokers and banks	6,003	22,874
Receivable from brokers, dealers and clearing organizations	126,436	(191,009)
Receivable from customers, net of allowance	(207)	(95,705)
Fees receivable, net of allowance	17,673	(46,170)
Due from related parties	9,783	440
Other assets	(14,597)	(9,344)
Consolidated Funds
Receivable on derivative contracts, at fair value	0	(2,917)
Other assets	0	13
Increase (decrease) in operating liabilities:
Securities sold, not yet purchased, at fair value, held at broker dealer	(208,080)	187,749
Securities sold under agreement to repurchase	165,723	(2,490)
Payable for derivative contracts, at fair value	(13,348)	(24,035)
Securities loaned	149,280	607,531
Payable to brokers, dealers and clearing organizations	987	73,328
Payable to customers	(188,958)	977,274
Commission management payable	23,978	22,634
Compensation payable	(279,653)	(17,809)
Fees payable	(9,903)	(918)
Due to related parties	27	48
Accounts payable, accrued expenses and other liabilities	14,907	39,591
Consolidated Funds
Due To Related Parties, Consolidated Funds	(23)	0
Accounts payable, accrued expenses and other liabilities	(51)	(359)
Net Cash Provided by (Used in) Operating Activities	(309,142)	363,161
Cash flows from investing activities:
Securities purchased under agreements to resell	19,621	(191)
Purchases of other investments	(7,662)	(29,117)
Purchase of business (see note 3)	0	2,109
Cash Divested from Deconsolidation	0	(5,620)
Proceeds from sales of other investments	9,780	31,267
Purchase of fixed assets and intangibles	(2,914)	(1,643)
Net Cash Provided by (Used in) Investing Activities	(20,417)	(2,813)
Cash flows from financing activities:
Deferred Debt Issuance Costs	(112)	(6,467)
Borrowings on notes and other debt	4,019	301,490
Repayments on notes and other debt	(2,193)	(139,737)
Purchase of treasury stock	(24,140)	(20,629)
Cash dividends paid	(3,917)	(2,313)
Preferred stock dividends paid	(1,698)	(1,698)
Contingent liability payment	(8,195)	(8,496)
Capital contributions by non-controlling interests in operating entities	1,610	3,498
Capital withdrawals to non-controlling interests in operating entities	(5,901)	(2,348)
Consolidated Funds
Capital contributions by non-controlling interests in Consolidated Funds	0	19,017
Capital withdrawals to non-controlling interests in Consolidated Funds	0	(16,424)
Net cash provided by / (used in) financing activities	(40,527)	125,893
Change in cash and cash equivalents	(370,086)	486,241
Total cash beginning of period	1,156,834	941,470
Cash and cash equivalents	512,978	1,147,531
Cash collateral pledged	52,865	110,303
Segregated Cash	220,882	168,942
Cash and cash equivalents, Consolidated Funds	23	935
Total cash at end of period	786,748	1,427,711
Supplemental information
Cash paid during the year for interest	40,538	65,259
Cash paid during the year for taxes	12,980	8,087
Purchase of treasury stock, at cost, through net settlement	12,283	6,245
Preferred stock dividends declared	1,698	1,698
Dividends, Cash	4,111	2,777
Net assets (liabilities) acquired upon acquisition (net of cash)	0	3,107
Net decrease in non-controlling interests in Consolidated Fund due to deconsolidation of Consolidated Fund	0	74,813
Common stock issuance upon close of acquisition	$ 1,881	$ 2,202