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Revenues (Tables)
 3 Months Ended
Mar. 31, 2024
Revenue from Contract with Customer [Abstract]  
Summary of Disaggregation of Revenue
The following table summarizes investment management fees by source:
 Three Months Ended
March 31,
(in thousands)20242023
Investment management fees
Open-end funds$78,680 $71,266 
Closed-end funds14,394 14,678 
Retail separate accounts48,981 40,079 
Institutional accounts46,305 38,455 
Total investment management fees$188,360 $164,478