Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating Activities
Net Income Including the Noncontrolling Interests in Subsidiaries	$ 148,066	$ 118,451
Adjustments to Reconcile Net Income to Net Cash Provided (Used) by Operating Activities
Amortization of Deferred Sales Commissions	770	1,130
Depreciation and Other Amortization	14,088	12,451
Share-Based Compensation Expense	13,935	13,188
Subsidiary Share-Based Compensation Expense	4,240	3,899
(Gain) Loss on Disposal of Assets	1,172	691
Provision (Benefit) for Deferred Income Taxes	6,637	5,338
Consolidation/Deconsolidation of Investment Companies	(3,051)	0
Net Unrealized (Gain) Loss on Investments	870	(2,926)
Net Sales (Purchases) of Investments—Consolidated Investment Companies	4,275	1,901
Other Changes in Assets and Liabilities:
(Increase) Decrease in Receivables, net	(10,904)	5,929
(Increase) Decrease in Prepaid Expenses and Other Assets	(10,135)	(2,116)
Increase (Decrease) in Accounts Payable and Accrued Expenses	(47,938)	(42,998)
Increase (Decrease) in Other Liabilities	31,372	(2,515)
Net Cash Provided (Used) by Operating Activities	153,397	112,423
Investing Activities
Purchases of Investments—Affiliates and Other	(15,508)	(15,362)
Cash Paid for Business Acquisitions, Net of Cash Acquired	2,697	785
Proceeds from Redemptions of Investments—Affiliates and Other	3,905	1,911
Cash Paid for Property and Equipment	(4,979)	(8,864)
Net Cash Provided (Used) by Investing Activities	(13,885)	(21,530)
Financing Activities
Dividends Paid	(54,559)	(54,549)
Purchases of Treasury Stock	(32,911)	(2,194)
Distributions to Noncontrolling Interest in Subsidiaries	(10,097)	(2,801)
Contributions from Noncontrolling Interest in Subsidiaries	11,802	1,864
Proceeds from New Borrowings	100,000	8,800
Payments on Debt	(110,000)	(18,800)
Other Financing Activities	(1,683)	171
Net Cash Provided (Used) by Financing Activities	(97,448)	(67,509)
Effect of Exchange Rates on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	(7,576)	(246)
Net Increase (Decrease) in Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	34,488	23,138
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Beginning of Period	249,511	157,426
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, End of Period	283,999	180,564
Less: Restricted Cash Recorded in Other Current Assets	5,849	0
Less: Restricted Cash and Restricted Cash Equivalents Recorded in Other Long-Term Assets	310	603
Cash and Cash Equivalents	$ 277,840	$ 179,961