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Revenues (Tables)
 6 Months Ended
Jun. 30, 2024
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue
The following table summarizes investment management fees by source:
 Three Months Ended
June 30,		Six Months Ended
June 30,
(in thousands)2024202320242023
Investment management fees
Open-end funds$79,883 $78,161 $158,563 $149,427 
Closed-end funds14,405 14,674 28,799 29,352 
Retail separate accounts52,216 42,803 101,197 82,882 
Institutional accounts45,148 44,341 91,453 82,796 
Total investment management fees$191,652 $179,979 $380,012 $344,457