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Share Repurchase Program (Tables) | 12 Months Ended
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Dec. 31, 2020
Share Repurchase Program |
Schedule of shares repurchased | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended
​ | ​ | December 31,
​ |  | 2020 |  | 2019
Shares repurchased |  | ​ | 4,832 |  | ​ | 3,877
Average price per share | ​ | $ | 431.93 | ​ | $ | 369.55
Total investment | ​ | $ | 2,087,146 | ​ | $ | 1,432,752

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