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Revenues from Contracts with Customers (Tables) | 9 Months Ended
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Sep. 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 September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Revenues from contracts with customers: |  |  |  |  |  |  |
Commissions | $ | 367,016 |  |  | $ | 352,027 |  |  | $ | 1,192,004 |  |  | $ | 1,190,522 |
Data, software, and post-trade | 22,238 |  |  | 21,523 |  |  | 65,826 |  |  | 61,060 |
Fees from related parties | 3,470 |  |  | 8,814 |  |  | 11,500 |  |  | 20,897 |
Other revenues | 3,236 |  |  | 4,077 |  |  | 10,308 |  |  | 11,427 |
Total revenues from contracts with customers | 395,960 |  |  | 386,441 |  |  | 1,279,638 |  |  | 1,283,906 |
Other sources of revenues: |  |  |  |  |  |  |
Principal transactions | 73,997 |  |  | 65,182 |  |  | 254,757 |  |  | 277,946 |
Interest and dividend income | 3,042 |  |  | 2,418 |  |  | 17,535 |  |  | 13,115 |
Other revenues | 748 |  |  | 1,001 |  |  | 1,843 |  |  | 2,368 |
Total revenues | $ | 473,747 |  |  | $ | 455,042 |  |  | $ | 1,553,773 |  |  | $ | 1,577,335 |

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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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