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Revenues (Tables)
 3 Months Ended
Mar. 31, 2025
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue
The following table summarizes investment management fees by source:
 Three Months Ended
March 31,
(in thousands)20252024
Investment management fees
Open-end funds$74,037 $78,680 
Closed-end funds14,853 14,394 
Retail separate accounts54,272 48,981 
Institutional accounts42,929 46,305 
Total investment management fees$186,091 $188,360