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Revenues from Contracts with Customers (Tables) | 3 Months Ended
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Mar. 31, 2021
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):
| Three Months Ended March 31, |
| 2021 |  |  | 2020 |
Revenues from contracts with customers: |  |  |  |  |  |  |
Commissions | $ | 435,220 |  |  | $ | 455,855 |
Data, software, and post-trade |  | 21,986 |  |  |  | 19,398 |
Fees from related parties |  | 3,785 |  |  |  | 5,521 |
Other revenues |  | 3,898 |  |  |  | 3,957 |
Total revenues from contracts with customers |  | 464,889 |  |  |  | 484,731 |
Other sources of revenues: |  |  |  |  |  |  |
Principal transactions |  | 98,763 |  |  |  | 113,311 |
Interest and dividend income |  | 3,038 |  |  |  | 4,161 |
Other revenues |  | 886 |  |  |  | 964 |
Total revenues | $ | 567,576 |  |  | $ | 603,167 |

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