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Investments (Tables)
 3 Months Ended
Mar. 31, 2022
Schedule of Investments [Abstract]  
Schedule of Investments The Company's investments, excluding the assets of consolidated investment products ("CIP") discussed in Note 16, at March 31, 2022 and December 31, 2021 were as follows:
(in thousands)March 31, 2022December 31, 2021
Investment securities - fair value$88,421 $80,335 
Equity method investments (1)13,495 13,038 
Nonqualified retirement plan assets12,701 13,321 
Other investments2,150 2,196 
Total investments$116,767 $108,890 
(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, 2022December 31, 2021
(in thousands)CostFair ValueCostFair Value
Investment Securities - fair value
Sponsored funds$74,362 $75,722 $63,090 $66,326 
Equity securities10,676 12,699 10,659 14,009 
Total investment securities - fair value$85,038 $88,421 $73,749 $80,335