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Revenues from Contracts with Customers (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Revenues from contracts with customers: |  |  |  |  |  |  |
Commissions | $ | 389,768 |  |  | $ | 382,640 |  |  | $ | 824,988 |  |  | $ | 838,495 |
Data, software, and post-trade | 21,602 |  |  | 20,139 |  |  | 43,588 |  |  | 39,537 |
Fees from related parties | 4,245 |  |  | 6,562 |  |  | 8,030 |  |  | 12,083 |
Other revenues | 3,172 |  |  | 3,391 |  |  | 7,071 |  |  | 7,350 |
Total revenues from contracts with customers | 418,787 |  |  | 412,732 |  |  | 883,677 |  |  | 897,465 |
Other sources of revenues: |  |  |  |  |  |  |
Principal transactions | 81,997 |  |  | 99,453 |  |  | 180,760 |  |  | 212,764 |
Interest and dividend income | 11,455 |  |  | 6,536 |  |  | 14,493 |  |  | 10,697 |
Other revenues | 211 |  |  | 367 |  |  | 1,096 |  |  | 1,329 |
Total revenues | $ | 512,450 |  |  | $ | 519,088 |  |  | $ | 1,080,026 |  |  | $ | 1,122,255 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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