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 (loss)	$ 70,795	$ 63,889
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation expense, intangible asset and other amortization	31,896	36,533
Stock-based compensation	13,543	16,020
Equity in earnings of equity method investments	(2,127)	(1,436)
Distributions from equity method investments	3,492	2,341
Change in fair value of contingent consideration	(3,014)	(3,300)
Lease termination	0	(1,334)
Deferred taxes, net	3,434	653
Changes in operating assets and liabilities:
Sales (purchases) of investments, net	3,834	6,851
Accounts receivable, net and other assets	9,460	10,255
Accrued compensation and benefits, accounts payable, accrued liabilities and other liabilities	(103,610)	(101,798)
Operating activities of consolidated investment products ("CIP"):
Net cash provided by (used in) operating activities	71,970	35,427
Cash Flows from Investing Activities:
Capital expenditures	(4,534)	(3,251)
Net cash provided by (used in) investing activities	(4,012)	(3,800)
Cash Flows from Financing Activities:
Repayments on credit agreement	(1,375)	(6,375)
Common stock dividends paid	(32,967)	(28,597)
Repurchase of common shares	(50,000)	(17,499)
Payment of contingent consideration	(23,140)	(24,234)
Taxes paid related to net share settlement of restricted stock units	(6,965)	(10,444)
Investment management subsidiary equity sales (purchases)	(1,053)	(419)
Net contributions from (distributions to) noncontrolling interests	15,300	18,156
Net cash provided by (used in) financing activities	(226,525)	(21,844)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	1,594	(100)
Net increase (decrease) in cash, cash equivalents and restricted cash	(156,973)	9,683
Cash, cash equivalents and restricted cash, beginning of period	400,309	341,014
Cash, cash equivalents and restricted cash, end of period	243,336	350,697
Non-Cash Financing Activities:
Increase (decrease) to noncontrolling interests due to consolidation (deconsolidation) of CIP, net	(166)	(10,199)
Common stock dividends payable	15,183	13,561
Reconciliation of cash, cash equivalents and restricted cash
Cash, cash equivalents and restricted cash at end of period	243,336	350,697
Consolidated Entity excluding Consolidated Investment Products
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Realized and unrealized (gains) losses on investments of CIP, net	(2,987)	(1,838)
Operating activities of consolidated investment products ("CIP"):
Realized and unrealized (gains) losses on investments of CIP, net	(2,987)	(1,838)
Reconciliation of cash, cash equivalents and restricted cash
Cash and cash equivalents	172,204
Consolidated Investment Products
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Realized and unrealized (gains) losses on investments of CIP, net	6,903	7,231
Operating activities of consolidated investment products ("CIP"):
Realized and unrealized (gains) losses on investments of CIP, net	6,903	7,231
Purchases of investments by CIP	(538,448)	(629,549)
Sales of investments by CIP	581,278	635,658
Net proceeds (purchases) of short-term investments and securities sold short by CIP	(120)	207
Change in other assets and liabilities of CIP	(2,359)	(6,843)
Amortization of discount on notes payable of CIP	0	1,887
Cash Flows from Investing Activities:
Change in cash and cash equivalents of CIP due to consolidation (deconsolidation), net	522	(549)
Cash Flows from Financing Activities:
Payments on borrowings by CIP	(126,325)	(690,496)
Borrowings by CIP	0	$ 738,064
Reconciliation of cash, cash equivalents and restricted cash
Cash and cash equivalents	70,506
Cash pledged or on deposit of CIP	$ 626