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Revenue from Contracts with Customers - Disaggregation of Revenue by Performance Obligation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Total Revenue $ 1,300,447 $ 1,448,268 $ 1,326,894
Asset Management      
Disaggregation of Revenue [Line Items]      
Total Revenue 915,984 1,011,467 907,605
Administrative Services      
Disaggregation of Revenue [Line Items]      
Total Revenue 306,639 318,152 245,887
Distribution      
Disaggregation of Revenue [Line Items]      
Total Revenue 49,600 92,922 151,106
Other      
Disaggregation of Revenue [Line Items]      
Total Revenue $ 28,224 $ 25,727 $ 22,296