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Derivative Financial Instruments - Visa Class B Restricted Shares (Details) - Class B restricted shares $ in Thousands | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) shares | Sep. 30, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | Sep. 27, 2019 | Jul. 05, 2018 | Jun. 28, 2018 | Dec. 31, 2017
Visa |  |  |  |  |  |  |
Visa Class B Restricted Shares |  |  |  |  |  |  |
Net realized gain related to the sale of stock | $ | $ 22,700 |  |  |  |  |  |
Number of shares sold | shares | 274,000 |  |  |  |  |  |
Shares held | shares |  | 120,000 | 120,000 |  |  |  |
Cost basis | $ |  | $ 0 | $ 0 |  |  |  |
Visa Derivative |  |  |  |  |  |  |
Visa Class B Restricted Shares |  |  |  |  |  |  |
Conversion rate |  |  |  | 1.6228 | 1.6228 | 1.6483 | 1.6483

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