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Common Shares (Activity Under At-The-Market Share Offering Program) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | May 05, 2017
Common shares sold | 4,778 | 0 | 0 |
2014 ATM program [Member] |  |  |  |
Maximum aggregate offering price of remaining common shares available for sale |  |  |  | $ 315,300,000
Total net consideration | $ 2,513,600 |  |  |
Common shares sold | 28,100 |  |  |
Average price per common share sold | $ 90.44 |  |  |

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