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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

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