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Revenues From Contracts With Customers (Schedule of Total Revenues Separated between Revenues from Contracts with Customers and Other Sources of Revenues) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues:                      
Revenue from contracts with customers                 $ 2,352,237 $ 2,187,145  
Other                 19,287 15,568  
Total revenue from contracts with customers                 2,352,237 2,187,145  
Other sources of revenue:                      
Interest $ 167,087 $ 178,784 $ 187,940 $ 191,071 $ 184,534 $ 169,760 $ 154,421 $ 137,734 724,882 646,449 $ 454,381
Principal transactions                 404,751 351,378 396,826
Other                 33,091 9,985  
Total revenues $ 975,699 $ 865,716 $ 853,678 $ 819,868 $ 851,325 $ 786,810 $ 780,011 $ 776,811 3,514,961 3,194,957 2,996,462
Commissions [Member]                      
Revenues:                      
Revenue from contracts with customers                 667,494 657,732 678,904
Investment Banking [Member]                      
Revenues:                      
Revenue from contracts with customers                 817,421 707,670 726,763
Asset Management and Service Fees [Member]                      
Revenues:                      
Revenue from contracts with customers                 $ 848,035 $ 806,175 $ 702,064