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Common Shares (Activity Under At-The-Market Share Offering Program) (Details) (USD $) | 3 Months Ended | 1 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2013 2012 ATM Program [Member] | May 07, 2014 Subsequent Event [Member] 2012 ATM Program [Member]
Total net consideration | $ 9,366,000 | $ 9,365,500 |
Common shares sold |  | 135,700 | 0
Average price per share |  | $ 70.63 |
Maximum aggregate offering price of remaining common shares available for sale |  |  | $ 82,700,000

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