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Revenues
 9 Months Ended
Sep. 30, 2024
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
September 30,		Nine Months Ended
September 30,
(in thousands)2024202320242023
Investment management fees
Open-end funds$79,428 $80,294 $237,991 $229,721 
Closed-end funds14,942 14,673 43,741 44,025 
Retail separate accounts52,068 44,441 153,265 127,323 
Institutional accounts47,405 45,461 138,858 128,257 
Total investment management fees$193,843 $184,869 $573,855 $529,326