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Revenue from Contracts with Customers (Tables) | 3 Months Ended
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Mar. 31, 2019
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, 2019 |  |  | Three Months Ended March 31, 2018 |
Revenue from contracts with customers: |  |  |  |  |  |  |  |
Commissions |  | $ | 429,520 |  |  | $ | 407,857 |
Data, software, and post-trade |  |  | 17,910 |  |  |  | 15,099 |
Fees from related parties |  |  | 5,795 |  |  |  | 6,299 |
Other revenues |  |  | 2,775 |  |  |  | — |
Total revenue from contracts with customers |  |  | 456,000 |  |  |  | 429,255 |
Other sources of revenue: |  |  |  |  |  |  |  |
Principal transactions |  |  | 84,230 |  |  |  | 91,918 |
Interest income |  |  | 3,665 |  |  |  | 2,675 |
Other revenues |  |  | 856 |  |  |  | 926 |
Total revenues |  | $ | 544,751 |  |  | $ | 524,774 |

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