Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash Flows From Operating Activities
Net Income	$ 93,124	$ 92,241
Adjustments to Reconcile Net Income to Net Cash Provided by (Used In) Operating Activities:
Net (Gains) Losses on Investments, Investment Securities and Contingent Consideration	(14,708)	(9,509)
Equity Method Investments	22	(890)
Equity-Based and Other Deferred Compensation	139,337	130,242
Noncash Lease Expense	9,928	11,045
Depreciation, Amortization and Accretion, net	1,911	5,287
Bad Debt Expense	(567)	3,734
Deferred Taxes	(47)	(2,514)
Decrease (Increase) in Operating Assets:
Investment Securities	12,346	1,676
Accounts Receivable	39,573	83,422
Receivable from Employees and Related Parties	(4,070)	1,268
Other Assets	53,051	82,271
(Decrease) Increase in Operating Liabilities:
Accrued Compensation and Benefits	(628,439)	(767,197)
Accounts Payable and Accrued Expenses	3,507	(1,132)
Payables to Employees and Related Parties	20,389	4,788
Taxes Payable	(2,807)	(6,217)
Other Liabilities	(3,771)	(13,252)
Net Cash Provided by (Used in) Operating Activities	(281,221)	(384,737)
Cash Flows From Investing Activities
Investments Purchased	0	(37)
Distributions of Private Equity Investments	0	72
Investment Securities:
Proceeds from Sales and Maturities of Investment Securities	1,272,891	1,409,643
Purchases of Investment Securities	(701,428)	(851,103)
Maturity of Certificates of Deposit	54,462	82,759
Purchase of Certificates of Deposit	(48,317)	(5,222)
Purchase of Furniture, Equipment and Leasehold Improvements	(1,105)	(4,858)
Net Cash Provided by Investing Activities	576,503	631,254
Cash Flows From Financing Activities
Distributions to Noncontrolling Interests	(9,438)	(9,202)
Payments Under Tax Receivable Agreement	(607)	0
Purchase of Treasury Stock and Noncontrolling Interests	(265,322)	(286,592)
Dividends	(43,236)	(41,193)
Net Cash Provided by (Used in) Financing Activities	(318,603)	(336,987)
Effect of Exchange Rate Changes on Cash	(3,767)	6,472
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	(27,088)	(83,998)
Cash, Cash Equivalents and Restricted Cash – Beginning of Period	605,484	672,123
Cash, Cash Equivalents and Restricted Cash – End of Period	578,396	588,125
SUPPLEMENTAL CASH FLOW DISCLOSURE
Payments for Interest	1,790	1,790
Payments for Income Taxes	15,305	33,255
Accrued Dividends	$ 4,028	$ 4,205