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Investments (Tables)
 9 Months Ended
Sep. 30, 2020
Schedule of Investments [Abstract]  
Summary of Investments The Company's investments, excluding the assets of consolidated investment products ("CIP") discussed in Note 15, at September 30, 2020 and December 31, 2019 were as follows:
(in thousands)September 30, 2020December 31, 2019
Investment securities - fair value$31,641 $60,990 
Equity method investments (1)12,039 12,030 
Nonqualified retirement plan assets9,302 8,724 
Other investments1,464 1,462 
Total investments$54,446 $83,206 
(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, 2020December 31, 2019
(in thousands)CostFair ValueCostFair Value
Investment Securities - fair value
Sponsored funds$21,075 $22,043 $44,588 $47,654 
Equity securities7,105 9,594 11,250 13,320 
Debt securities7 4 44 16 
Total investment securities - fair value$28,187 $31,641 $55,882 $60,990