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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2021
Stockholders' equity: |
Schedule of dividend activity | During the nine months ended September 30, 2021 the Corporation had the following dividend activity: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Date | ​ | Date of | ​ | Date | ​ | ​ | Quarterly | ​ | ​ | Special
Declared |  | Record | ​ | Paid | ​ | ​ | Dividend | ​ | ​ | Dividend
January 28, 2021 | ​ | February 8, 2021 | ​ | February 22, 2021 | ​ | $ | 0.125 | ​ | $ | —
February 16, 2021 | ​ | March 1, 2021 | ​ | March 15, 2021 | ​ | ​ | — | ​ | ​ | 1.00
April 22, 2021 | ​ | May 10, 2021 | ​ | May 17, 2021 | ​ | ​ | 0.125 | ​ | ​ | —
July 22, 2021 | ​ | August 9, 2021 | ​ | August 16, 2021 | ​ | ​ | 0.125 | ​ | ​ | —

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