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Revenue from Contracts with Customers - Disaggregation of Revenue by Performance Obligation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Revenue $ 307,050 $ 263,852
Asset Management    
Disaggregation of Revenue [Line Items]    
Revenue 211,199 174,266
Administrative Services    
Disaggregation of Revenue [Line Items]    
Revenue 54,135 49,023
Distribution    
Disaggregation of Revenue [Line Items]    
Revenue 36,246 38,057
Other    
Disaggregation of Revenue [Line Items]    
Revenue $ 5,470 $ 2,506