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Revenue from Contracts with Customers - Disaggregation of Revenue by Performance Obligation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]      
Total Revenue $ 1,445,814 $ 1,300,447 $ 1,448,268
Asset Management      
Disaggregation of Revenue [Line Items]      
Total Revenue 1,011,631 915,984 1,011,467
Administrative Services      
Disaggregation of Revenue [Line Items]      
Total Revenue 294,557 306,639 318,152
Distribution      
Disaggregation of Revenue [Line Items]      
Total Revenue 112,356 49,600 92,922
Other      
Disaggregation of Revenue [Line Items]      
Total Revenue $ 27,270 $ 28,224 $ 25,727