Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Operating Activities
Net Income Including the Noncontrolling Interests in Subsidiaries	$ 200,567	$ 94,235
Adjustments to Reconcile Net Income to Net Cash Provided (Used) by Operating Activities
Depreciation and Amortization	11,053	11,159
Share-Based Compensation Expense	17,509	16,571
(Gain) Loss on Disposal of Assets	(3,232)	243
Provision (Benefit) for Deferred Income Taxes	(849)	(4,631)
Consolidation/(Deconsolidation) of Other Entities	0	(2,759)
Net Unrealized (Gain) Loss on Investments	(8,943)	(998)
Net Sales (Purchases) of Investments—Consolidated Investment Companies	(83,444)	(8,964)
Impairment of Intangible Asset	0	66,331
Other Changes in Assets and Liabilities:
(Increase) Decrease in Receivables, net	(5,507)	7,392
(Increase) Decrease in Prepaid Expenses and Other Assets	(3,748)	6,297
Increase (Decrease) in Accounts Payable and Accrued Expenses	(79,061)	(62,846)
Increase (Decrease) in Other Liabilities	(11,259)	(19,325)
Net Cash Provided (Used) by Operating Activities	33,086	102,705
Investing Activities
Purchases of Investments—Affiliates and Other	(2,738)	(28,611)
Cash Paid for Business Acquisitions, Net of Cash Acquired	(12,755)	0
Proceeds from Redemptions of Investments—Affiliates and Other	5,735	66,322
Cash Paid for Property and Equipment	(1,758)	(6,547)
Other Investing Activities	(6,028)	0
Net Cash Provided (Used) by Investing Activities	(17,544)	31,164
Financing Activities
Dividends Paid	(52,151)	(134,015)
Purchases of Treasury Stock	(185,655)	(85,268)
Distributions to Noncontrolling Interests in Subsidiaries	(21,903)	(7,840)
Contributions from Noncontrolling Interests in Subsidiaries	90,440	19,027
Other Financing Activities	8	(479)
Net Cash Provided (Used) by Financing Activities	(169,261)	(208,575)
Effect of Exchange Rates on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	17,622	(1,337)
Net Increase (Decrease) in Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	(136,097)	(76,043)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Beginning of Period	507,567	386,954
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, End of Period	371,470	310,911
Less: Restricted Cash Recorded in Other Current Assets	0	3,005
Less: Restricted Cash and Restricted Cash Equivalents Recorded in Other Long-Term Assets	483	473
Cash and Cash Equivalents	$ 370,987	$ 307,433