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Revenues from Contracts with Customers (Schedule of Total Revenues Broken Out by Revenues from Contracts with Customers and Other Sources of Revenues) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Revenues:    
Revenue from contracts with customers [1] $ 698,225 $ 794,566
Other sources of revenue:    
Interest 451,564 165,435
Principal transactions 115,522 159,270
Other (3,520) 6,713
Total revenues 1,261,791 1,125,984
Commissions [Member]    
Revenues:    
Revenue from contracts with customers 169,550 195,909
Investment Banking [Member]    
Revenues:    
Revenue from contracts with customers 211,879 254,846
Asset management [Member]    
Revenues:    
Revenue from contracts with customers 315,569 341,636
Other [Member]    
Revenues:    
Revenue from contracts with customers [1] $ 1,227 $ 2,175
[1] Excludes revenues not derived from contracts with customers included in the Other segment.