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Investments (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2021 and December 31, 2020 were as follows:
(in thousands)March 31, 2021December 31, 2020
Investment securities - fair value$40,904 $39,990 
Equity method investments (1)13,568 12,676 
Nonqualified retirement plan assets11,177 10,612 
Other investments2,002 1,666 
Total investments$67,651 $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:
March 31, 2021December 31, 2020
(in thousands)CostFair ValueCostFair Value
Investment Securities - fair value
Sponsored funds$27,323 $26,598 $22,378 $25,909 
Equity securities10,467 14,303 9,614 14,078 
Debt securities7 3 7 3 
Total investment securities - fair value$37,797 $40,904 $31,999 $39,990