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Investments (Tables)
 9 Months Ended
Sep. 30, 2021
Schedule of Investments [Abstract]  
Summary of Investments The Company's investments, excluding the assets of consolidated investment products ("CIP") discussed in Note 16, at September 30, 2021 and December 31, 2020 were as follows:
(in thousands)September 30, 2021December 31, 2020
Investment securities - fair value$78,143 $39,990 
Equity method investments (1)12,914 12,676 
Nonqualified retirement plan assets12,378 10,612 
Other investments2,197 1,666 
Total investments$105,632 $64,944 
(1)     The Company's equity method investments are valued on a three-month lag based upon the availability of financial information.
Schedule of Marketable Securities The composition of the Company’s investment securities - fair value was as follows:
September 30, 2021December 31, 2020
(in thousands)CostFair ValueCostFair Value
Investment Securities - fair value
Sponsored funds$59,342 $64,691 $22,378 $25,909 
Equity securities10,362 13,446 9,614 14,078 
Debt securities7 6 7 3 
Total investment securities - fair value$69,711 $78,143 $31,999 $39,990