Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Cash Flows From Operating Activities
Net Income	$ 329,480	$ 106,108
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Net (Gains) Losses on Investments and Investment Securities	(22,193)	11,780
Equity Method Investments	5,038	3,309
Equity-Based and Other Deferred Compensation	202,186	176,968
Noncash Lease Expense	20,311	18,284
Depreciation, Amortization and Accretion	14,129	15,989
Bad Debt Expense	(1,766)	5,331
Deferred Taxes	3,982	2,112
Decrease (Increase) in Operating Assets:
Investment Securities	(1,946)	2,601
Financial Instruments Owned and Pledged as Collateral at Fair Value	0	(6,486)
Securities Purchased Under Agreements to Resell	0	6,334
Accounts Receivable	42,638	(25,778)
Receivable from Employees and Related Parties	4,558	(612)
Other Assets	(20,482)	33,968
(Decrease) Increase in Operating Liabilities:
Accrued Compensation and Benefits	(359,317)	(241,190)
Accounts Payable and Accrued Expenses	6,001	62
Securities Sold Under Agreements to Repurchase	0	149
Payables to Employees and Related Parties	23,791	5,529
Taxes Payable	(10,537)	380
Other Liabilities	(121,415)	3,932
Net Cash Provided by Operating Activities	114,458	118,770
Cash Flows From Investing Activities
Investments Purchased	(1,355)	0
Proceeds from Redemption of G5 Debt Security	11,779	0
Distributions of Private Equity Investments	171	234
Investment Securities:
Proceeds from Sales and Maturities of Investment Securities and Futures Contracts Activity	992,836	543,251
Purchases of Investment Securities and Futures Contracts Activity	(852,579)	(244,470)
Maturity of Certificates of Deposit	0	214,266
Purchase of Certificates of Deposit	(122,510)	0
Purchase of Furniture, Equipment and Leasehold Improvements	(16,374)	(29,665)
Net Cash Provided by Investing Activities	11,968	483,616
Cash Flows From Financing Activities
Issuance of Noncontrolling Interests	1,107	540
Distributions to Noncontrolling Interests	(29,642)	(14,009)
Payment of Notes Payable	(38,000)	0
Issuance of Notes Payable	38,000	0
Payments of Debt Issuance Costs	(355)	0
Purchase of Treasury Stock and Noncontrolling Interests	(423,188)	(143,412)
Dividends	(65,139)	(57,529)
Net Cash Provided by (Used in) Financing Activities	(517,217)	(214,410)
Effect of Exchange Rate Changes on Cash	3,558	(6,842)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	(387,233)	381,134
Cash, Cash Equivalents and Restricted Cash – Beginning of Period	838,224	643,886
Cash, Cash Equivalents and Restricted Cash – End of Period	450,991	1,025,020
SUPPLEMENTAL CASH FLOW DISCLOSURE
Payments for Interest	8,912	12,856
Payments for Income Taxes	70,772	23,646
Accrued Dividends	7,096	6,918
Noncash Purchase of Noncontrolling Interest	0	851
Receipt of Equity Securities in Settlement of Accounts Receivable	$ 1,955	$ 0

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