Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash Flows From Operating Activities
Net Income	$ 177,094	$ 165,551
Adjustments to Reconcile Net Income to Net Cash Provided by (Used In) Operating Activities:
Net (Gains) Losses on Investments, Investment Securities and Contingent Consideration	4,456	(7,605)
Equity Method Investments, Including Gain on Sale	(786)	349
Equity-Based and Other Deferred Compensation	117,524	94,211
Noncash Lease Expense	10,094	10,058
Depreciation, Amortization and Accretion	7,219	6,751
Bad Debt Expense	(519)	(1,738)
Deferred Taxes	(1,942)	4,502
Decrease (Increase) in Operating Assets:
Investment Securities	(21)	(1,950)
Accounts Receivable	36,230	14,265
Receivable from Employees and Related Parties	1,460	523
Other Assets	(14,980)	17,550
(Decrease) Increase in Operating Liabilities:
Accrued Compensation and Benefits	(839,975)	(535,197)
Accounts Payable and Accrued Expenses	373	2,397
Payables to Employees and Related Parties	28,261	22,736
Taxes Payable	(4,462)	(13,537)
Other Liabilities	(6,246)	(108,977)
Net Cash Provided by (Used In) Operating Activities	(486,220)	(330,111)
Cash Flows From Investing Activities
Investments Purchased	0	(159)
Proceeds from Sale of Investments	18,300	0
Distributions of Private Equity Investments	20	5
Investment Securities:
Proceeds from Sales and Maturities of Investment Securities	1,325,038	888,534
Purchases of Investment Securities	(626,283)	(616,624)
Maturity of Certificates of Deposit	67,796	0
Purchase of Certificates of Deposit	(85,843)	(73,877)
Purchase of Furniture, Equipment and Leasehold Improvements	(5,491)	(7,714)
Net Cash Provided by Investing Activities	693,537	190,165
Cash Flows From Financing Activities
Issuance of Noncontrolling Interests	300	1,107
Distributions to Noncontrolling Interests	(4,740)	(12,894)
Payment of Notes Payable	0	(38,000)
Issuance of Notes Payable	0	38,000
Purchase of Treasury Stock and Noncontrolling Interests	(283,126)	(231,296)
Dividends	(41,619)	(37,414)
Net Cash Provided by (Used in) Financing Activities	(329,185)	(280,497)
Effect of Exchange Rate Changes on Cash	(1,531)	1,816
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	(123,399)	(418,627)
Cash, Cash Equivalents and Restricted Cash – Beginning of Period	587,293	838,224
Cash, Cash Equivalents and Restricted Cash – End of Period	463,894	419,597
SUPPLEMENTAL CASH FLOW DISCLOSURE
Payments for Interest	3,542	4,469
Payments for Income Taxes	36,867	27,331
Accrued Dividends	4,128	3,411
Amounts Due for Purchase of Noncontrolling Interest	1,448	3,170
Settlement of Sale of Trilantic VI	9,188	0
Receipt of Equity Securities in Settlement of Accounts Receivable	0	1,955
Debt Issuance Costs Accrued	$ 0	$ 355