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Revenues
 6 Months Ended
Jun. 30, 2022
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 customers. 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)2022202120222021
Investment management fees
Open-end funds$84,875 $97,273 $182,252 $186,393 
Closed-end funds16,174 16,395 33,114 29,335 
Retail separate accounts45,312 42,475 94,915 79,987 
Institutional accounts38,663 37,367 81,560 71,064 
Total investment management fees$185,024 $193,510 $391,841 $366,779