Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Cash Flows From Operating Activities
Net Income	$ 260,729	$ 174,857
Adjustments to Reconcile Net Income to Net Cash Provided by (Used In) Operating Activities:
Net (Gains) Losses on Investments, Investment Securities and Contingent Consideration	(7,723)	(20,757)
Equity Method Investments	189	176
Equity-Based and Other Deferred Compensation	329,365	288,412
Noncash Lease Expense	25,062	19,886
Depreciation, Amortization and Accretion, net	3,610	1,079
Bad Debt Expense	3,530	971
Deferred Taxes	(6,671)	(606)
Decrease (Increase) in Operating Assets:
Investment Securities	10,185	16,214
Accounts Receivable	(57,397)	8,475
Receivable from Employees and Related Parties	(100)	72
Other Assets	(57,867)	19,923
(Decrease) Increase in Operating Liabilities:
Accrued Compensation and Benefits	(565,247)	(475,693)
Accounts Payable and Accrued Expenses	6,621	8,973
Payables to Employees and Related Parties	37,003	21,489
Taxes Payable	(2,568)	(3,193)
Other Liabilities	(90,637)	6,989
Net Cash Provided by (Used in) Operating Activities	(111,916)	67,267
Cash Flows From Investing Activities
Investments Purchased	1,000	0
Distributions of Private Equity Investments	1,270	0
Investment Securities:
Proceeds from Sales and Maturities of Investment Securities	1,443,298	1,633,347
Purchases of Investment Securities	(1,017,910)	(1,179,299)
Maturity of Certificates of Deposit	66,422	54,462
Purchase of Certificates of Deposit	(80,766)	(115,814)
Purchase of Furniture, Equipment and Leasehold Improvements	(45,706)	(8,918)
Net Cash Provided by Investing Activities	365,608	383,778
Cash Flows From Financing Activities
Issuance of Noncontrolling Interests	1,331	85
Distributions to Noncontrolling Interests	(13,309)	(15,973)
Payments Under Tax Receivable Agreement	(597)	(607)
Purchase of Treasury Stock and Noncontrolling Interests	(450,139)	(320,347)
Dividends	(79,091)	(74,145)
Net Cash Provided by (Used in) Financing Activities	(541,805)	(410,987)
Effect of Exchange Rate Changes on Cash	33,255	(5,084)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	(254,858)	34,974
Cash, Cash Equivalents and Restricted Cash – Beginning of Period	882,107	605,484
Cash, Cash Equivalents and Restricted Cash – End of Period	627,249	640,458
SUPPLEMENTAL CASH FLOW DISCLOSURE
Payments for Interest	8,130	8,096
Payments for Income Taxes	40,387	46,212
Accrued Dividends	$ 7,672	$ 8,030