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Revenues from Contracts with Customers (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue From Contract With Customer [Abstract] |
Summary of Revenues from Contracts with Customers and Other Sources of Revenues | The following table presents the Company’s total revenues separated between revenues from contracts with customers and other sources of revenues (in thousands):
|  | Year Ended December 31, 2020 |  |  | Year Ended December 31, 2019 |
Revenues from contracts with customers: |  |  |  |  |  |  |  |
Commissions |  | $ | 1,567,668 |  |  | $ | 1,645,818 |
Data, software, and post-trade |  |  | 81,920 |  |  |  | 73,166 |
Fees from related parties |  |  | 25,754 |  |  |  | 29,442 |
Other revenues |  |  | 14,948 |  |  |  | 12,806 |
Total revenues from contracts with customers |  |  | 1,690,290 |  |  |  | 1,761,232 |
Other sources of revenues: |  |  |  |  |  |  |  |
Principal transactions |  |  | 351,633 |  |  |  | 321,923 |
Interest and dividend income |  |  | 12,332 |  |  |  | 18,319 |
Other revenues |  |  | 2,465 |  |  |  | 2,757 |
Total revenues |  | $ | 2,056,720 |  |  | $ | 2,104,231 |

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