Consolidated Statements of Cash Flow - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Flows from Operating Activities:
Net income (loss)	$ 106,628	$ 262,835	$ 119,963
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation expense, intangible asset and other amortization	64,215	50,769	38,853
Stock-based compensation	24,042	26,225	21,481
Amortization of deferred commissions	4,342	3,956	2,052
Payments of deferred commissions	(2,065)	(5,963)	(2,089)
Equity in earnings of equity method investments	(187)	(4,403)	(1,964)
Distributions from equity method investments	2,244	3,710	1,192
Sales (purchases) of investments, net	(9,309)	(7,952)	12,296
(Gain) loss on extinguishment of debt	0	0	(705)
Change in fair value of contingent consideration	8,020	12,400	0
Deferred taxes, net	(1,960)	(9,664)	6,332
Right of use asset	3,222	0	0
Changes in operating assets and liabilities:
Accounts receivable, net and other assets	37,548	(30,057)	(9,698)
Accrued compensation and benefits, accounts payable, accrued liabilities and other liabilities	(47,379)	72,628	13,743
Operating activities of consolidated investment products ("CIP"):
Net cash provided by (used in) operating activities	132,670	665,729	(226,103)
Cash Flows from Investing Activities:
Capital expenditures and other asset purchases	(6,582)	(5,838)	(1,043)
Acquisition of business, net of cash acquired of $8,443 and $1,197 for the years ended December 31, 2022 and 2021, respectively	(20,577)	(155,636)	0
Net cash provided by (used in) investing activities	(27,467)	(175,033)	8,681
Cash Flows from Financing Activities:
Refinancing of credit agreement	0	81,155	0
Payment of long-term debt	(12,750)	(12,513)	(79,086)
Payment of contingent consideration	(33,036)	0	0
Payment of deferred financing costs	0	(7,039)	0
Repurchase of common shares	(90,000)	(57,499)	(32,500)
Preferred stock dividends paid	0	0	(2,084)
Common stock dividends paid	(47,254)	(31,411)	(22,800)
Taxes paid related to net share settlement of restricted stock units	(16,830)	(19,443)	(6,445)
Affiliate equity sales (purchases)	(11,089)	0	0
Net contributions from (distributions to) noncontrolling interests	(5,527)	(3,270)	(7,263)
Net cash provided by (used in) financing activities	(102,057)	(244,400)	235,332
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(112)	0	0
Net increase (decrease) in cash and cash equivalents	3,034	246,296	17,910
Cash, cash equivalents and restricted cash, beginning of year	586,145	339,849	321,939
Cash, cash equivalents and restricted cash, end of year	589,179	586,145	339,849
Supplemental Disclosure of Cash Flow Information
Interest paid	11,134	6,478	8,857
Income taxes paid, net	74,313	95,411	35,388
Supplemental Disclosure of Non-Cash Investing and Financing Activities
Conversion of preferred stock to common stock	0	0	115,000
Common stock dividends payable	11,850	11,261	6,218
Contingent consideration	1,200	150,164	0
Reconciliation of cash, cash equivalents and restricted cash
Cash, cash equivalents and restricted cash at end of year	589,179	586,145	339,849
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	13,105	(2,721)	(7,128)
Operating activities of consolidated investment products ("CIP"):
Realized and unrealized (gains) losses on investments of CIP, net	(13,105)	2,721	7,128
Reconciliation of cash, cash equivalents and restricted cash
Cash and cash equivalents	338,234	378,921
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	36,054	(4,264)	(5,889)
Operating activities of consolidated investment products ("CIP"):
Realized and unrealized (gains) losses on investments of CIP, net	(36,054)	4,264	5,889
Purchases of investments by CIP	(939,017)	(1,176,936)	(1,304,723)
Sales of investments by CIP	820,497	1,454,591	883,888
Net proceeds (purchases) of short-term investments and securities sold short by CIP	(13)	16,272	(934)
Change in other assets and liabilities of CIP	6,813	(856)	(3,942)
Amortization of discount on notes payable of CIP	5,870	5,159	11,169
Cash Flows from Investing Activities:
Change in cash and cash equivalents of CIP due to consolidation (deconsolidation), net	(308)	(13,559)	9,724
Cash Flows from Financing Activities:
Borrowings by CIP	306,296	363,539	779,982
Payments on borrowings by CIP	(191,867)	(557,919)	(394,472)
Supplemental Disclosure of Non-Cash Investing and Financing Activities
Increase (decrease) to noncontrolling interests due to consolidation (deconsolidation) of CIP, net	(338)	(30,550)	$ 17,137
Reconciliation of cash, cash equivalents and restricted cash
Cash and cash equivalents	250,301	206,620
Cash pledged or on deposit of consolidated investment products	$ 644	$ 604