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Business Combinations (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Apr. 03, 2023
Dec. 31, 2022
Sep. 30, 2022
Business Acquisition [Line Items]        
Goodwill $ 656,109   $ 653,524 $ 653,079
Rothschild & Co Asset Management U.S.        
Business Acquisition [Line Items]        
Assets acquired in acquisition   $ 12,600    
Goodwill   $ 2,600