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Common Shares (Activity Under At-The-Market Share Offering Program) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Common shares sold | 0 | 3,599 | 0
2017 ATM program [Member] |  |  |
Total net consideration |  | $ 24,800,000 |
Common shares sold |  | 200,000 |

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