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Related Party Transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Asset management, administration and distribution fees      
Related Party Transaction [Line Items]      
Revenue from related parties $ 473,161 $ 432,806 $ 449,725
Transaction-based and trade execution fees      
Related Party Transaction [Line Items]      
Revenue from related parties $ 1,917 $ 2,159 $ 632