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Common Shares (Activity Under At-The-Market Share Offering Program) (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2012 Two Thousand Eleven Atm Program [Member] | Mar. 31, 2013 2012 ATM Program [Member] | May 03, 2013 2012 ATM Program [Member]
Maximum aggregate offering price of remaining common shares available for sale |  |  |  |  | $ 114,000,000
Total net consideration | $ 9,366,000 | $ 435,911,000 | $ 44,291,700 | $ 9,365,500 |
Common shares sold |  |  | 704,200 | 135,700 |
Average price per common share sold |  |  | $ 63.89 | $ 70.63 |

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