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Common Shares (Activity Under At-The-Market Share Offering Program) (Details) (USD $) | 6 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2013 2012 ATM Program [Member] | Jun. 30, 2013 2012 ATM Program [Member] | Aug. 01, 2014 Subsequent Event [Member] 2012 ATM Program [Member]
Total net consideration | $ 40,182,000 | $ 30,816,200 | $ 40,181,700 |
Common shares sold |  | 419,300 | 555,100 | 0
Average price per share |  | $ 74.74 | $ 73.73 |
Maximum aggregate offering price of remaining common shares available for sale |  |  |  | $ 82,700,000

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