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Revenues (Tables)
 9 Months Ended
Sep. 30, 2025
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue
The following table summarizes investment management fees by source:
 Three Months Ended
September 30,		Nine Months Ended
September 30,
(in thousands)2025202420252024
Investment management fees
Open-end funds$73,270 $79,428 $217,686 $237,991 
Closed-end funds15,635 14,942 45,369 43,741 
Retail separate accounts52,172 52,068 158,262 153,265 
Institutional accounts42,685 47,405 128,012 138,858 
Total investment management fees$183,762 $193,843 $549,329 $573,855