Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Cash Flows From Operating Activities
Net Income	$ 165,551	$ 38,880
Adjustments to Reconcile Net Income to Net Cash Provided by (Used In) Operating Activities:
Net (Gains) Losses on Investments, Investment Securities and Contingent Consideration	(7,605)	24,767
Equity Method Investments	349	(1,291)
Equity-Based and Other Deferred Compensation	94,211	77,910
Noncash Lease Expense	10,058	9,065
Depreciation, Amortization and Accretion	6,751	8,526
Bad Debt Expense	(1,738)	474
Deferred Taxes	4,502	2,105
Decrease (Increase) in Operating Assets:
Investment Securities	(1,950)	634
Financial Instruments Owned and Pledged as Collateral at Fair Value	0	(13,099)
Securities Purchased Under Agreements to Resell	0	12,831
Accounts Receivable	14,265	42,009
Receivable from Employees and Related Parties	523	(2,344)
Other Assets	17,550	(11,564)
(Decrease) Increase in Operating Liabilities:
Accrued Compensation and Benefits	(535,197)	(359,947)
Accounts Payable and Accrued Expenses	2,397	(6,070)
Securities Sold Under Agreements to Repurchase	0	266
Payables to Employees and Related Parties	22,736	4,152
Taxes Payable	(13,537)	(2,829)
Other Liabilities	(108,977)	1,219
Net Cash Provided by (Used In) Operating Activities	(330,111)	(174,306)
Cash Flows From Investing Activities
Investments Purchased	(159)	0
Distributions of Private Equity Investments	5	0
Investment Securities:
Proceeds from Sales and Maturities of Investment Securities	888,534	332,819
Purchases of Investment Securities and Futures Contracts Activity	(616,624)	(209,602)
Maturity of Certificates of Deposit	0	214,266
Purchase of Certificates of Deposit	(73,877)	0
Purchase of Furniture, Equipment and Leasehold Improvements	(7,714)	(12,661)
Net Cash Provided by Investing Activities	190,165	324,822
Cash Flows From Financing Activities
Issuance of Noncontrolling Interests	1,107	30
Distributions to Noncontrolling Interests	(12,894)	(11,068)
Payment of Notes Payable	(38,000)	0
Issuance of Notes Payable	38,000	0
Purchase of Treasury Stock and Noncontrolling Interests	(231,296)	(141,014)
Dividends	(37,414)	(33,781)
Net Cash Provided by (Used in) Financing Activities	(280,497)	(185,833)
Effect of Exchange Rate Changes on Cash	1,816	(8,429)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	(418,627)	(43,746)
Cash, Cash Equivalents and Restricted Cash-Beginning of Period	838,224	643,886
Cash, Cash Equivalents and Restricted Cash-End of Period	419,597	600,140
SUPPLEMENTAL CASH FLOW DISCLOSURE
Payments for Interest	4,469	5,667
Payments for Income Taxes	27,331	20,896
Accrued Dividends	3,411	3,531
Noncash Purchase of Noncontrolling Interest	3,170	1,703
Receipt of Equity Securities in Settlement of Accounts Receivable	1,955	0
Debt Issuance Costs Accrued	$ 355	$ 0

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