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Revenues
 6 Months Ended
Jun. 30, 2025
Revenue from Contract with Customer [Abstract]  
Revenues Revenues
The Company's revenues are recognized when a performance obligation is satisfied, which occurs when control of the services is transferred to clients. Investment management fees, distribution and service fees, and administration and shareholder service fees are generally calculated as a percentage of average net assets of the investment portfolios managed. The net asset values from which these fees are calculated are variable in nature and subject to factors outside of the
Company's control, such as additional investments, withdrawals and market performance. Because of this, these fees are considered constrained until the end of the contractual measurement period (monthly or quarterly), which is when asset values are generally determinable.

Investment Management Fees by Source    
The following table summarizes investment management fees by source:
 Three Months Ended
June 30,		Six Months Ended
June 30,
(in thousands)2025202420252024
Investment management fees
Open-end funds$70,379 $79,883 $144,416 $158,563 
Closed-end funds14,881 14,405 29,734 28,799 
Retail separate accounts51,818 52,216 106,090 101,197 
Institutional accounts42,398 45,148 85,327 91,453 
Total investment management fees$179,476 $191,652 $365,567 $380,012