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Common Shares (Activity Under At-The-Market Share Offering Program) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Total net consideration | $ 445,038,000 |  |  |
Common shares sold |  | 0 | 4,778 | 0
2014 ATM program [Member] |  |  |  |
Total net consideration |  | $ 2,513,600 |  |
Common shares sold |  | 28,100 |  |
Average price per common share sold |  | $ 90.44 |  |

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