Consolidated Statements of Cash Flow - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash Flows from Operating Activities:
Net income (loss)	$ 135,988	$ 152,453	$ 141,476
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation expense, intangible asset and other amortization	63,623	69,002	70,046
Stock-based compensation	23,964	32,841	26,825
Equity in (earnings) loss of equity method investments	(3,635)	(2,713)	198
Distributions from equity method investments	4,078	5,387	2,327
Change in fair value of contingent consideration	(2,214)	(5,608)	(5,510)
Deferred taxes, net	8,401	7,120	1,394
Lease termination	0	(1,318)	0
Changes in operating assets and liabilities:
Sales (purchases) of investments, net	409	26,114	(16)
Accounts receivable, net and other assets	22,224	8,834	5,388
Accrued compensation and benefits, accounts payable, accrued liabilities and other liabilities	(23,166)	(23,166)	3,863
Operating activities of consolidated investment products ("CIP"):
Net cash provided by (used in) operating activities	(67,199)	1,755	237,157
Cash Flows from Investing Activities:
Capital expenditures and other asset purchases	(6,890)	(5,579)	(8,821)
Purchase of equity method investment	(41,084)	0	(11,645)
Acquisition of business, net of cash acquired of $4,395 for the year ended December 31, 2023	0	0	(108,999)
Net cash provided by (used in) investing activities	(47,339)	(16,951)	(129,732)
Cash Flows from Financing Activities:
Refinancing and borrowings on credit agreement	201,191	0	50,000
Repayments on credit agreement	(40,254)	(22,750)	(52,750)
Payment of deferred financing costs	(7,366)	0	0
Payment of contingent consideration	(23,140)	(24,234)	(27,179)
Repurchase of common shares	(59,999)	(44,868)	(45,000)
Common stock dividends paid	(64,599)	(58,123)	(52,047)
Taxes paid related to net share settlement of restricted stock units	(7,847)	(11,681)	(13,774)
Investment management subsidiary equity sales (purchases)	(24,889)	(29,015)	(20,784)
Net contributions from (distributions to) noncontrolling interests	10,388	32,822	6,080
Net cash provided by (used in) financing activities	191,025	74,947	(356,113)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	1,390	(456)	523
Net increase (decrease) in cash and cash equivalents	77,877	59,295	(248,165)
Cash, cash equivalents and restricted cash, beginning of year	400,309	341,014	589,179
Cash, cash equivalents and restricted cash, end of year	478,186	400,309	341,014
Supplemental Disclosure of Cash Flow Information
Interest paid	19,069	20,260	22,307
Income taxes paid, net	46,042	56,379	31,160
Supplemental Disclosure of Non-Cash Investing and Financing Activities
Common stock dividends payable	16,068	15,676	13,467
Reconciliation of cash, cash equivalents and restricted cash
Cash, cash equivalents and restricted cash at end of year	478,186	400,309	341,014
Consolidated Entity excluding Consolidated Investment Products
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Realized and unrealized (gains) losses on investments, net	(4,214)	(2,795)	(6,132)
Operating activities of consolidated investment products ("CIP"):
Realized and unrealized (gains) losses on investments, net	(4,214)	(2,795)	(6,132)
Reconciliation of cash, cash equivalents and restricted cash
Cash and cash equivalents	386,483	265,888
Consolidated Investment Products
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Realized and unrealized (gains) losses on investments, net	18,364	5,279	(4,664)
Operating activities of consolidated investment products ("CIP"):
Realized and unrealized (gains) losses on investments, net	18,364	5,279	(4,664)
Purchases of investments by CIP	(1,447,091)	(1,468,615)	(1,264,708)
Sales of investments by CIP	1,130,806	1,196,438	1,263,580
Net proceeds (purchases) of short-term investments and securities sold short by CIP	(194)	49	(261)
Change in other assets and liabilities of CIP	2,008	(2,073)	1,666
Amortization of discount on notes payable of CIP	3,450	4,526	1,685
Cash Flows from Investing Activities:
Change in cash and cash equivalents of CIP due to consolidation (deconsolidation), net	635	(11,372)	(267)
Cash Flows from Financing Activities:
Borrowings by CIP	661,125	1,016,232	269,260
Payments on borrowings by CIP	(453,585)	(783,436)	(469,919)
Supplemental Disclosure of Non-Cash Investing and Financing Activities
Increase (decrease) to noncontrolling interests due to consolidation (deconsolidation) of CIP, net	9,221	(31,255)	$ (7,170)
Reconciliation of cash, cash equivalents and restricted cash
Cash and cash equivalents	90,686	133,694
Cash pledged or on deposit of consolidated investment products	$ 1,017	$ 727