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Common Shares (Activity Under At-The-Market Share Offering Program) (Details) (USD $) | 3 Months Ended | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Mar. 31, 2011 2010 ATM Program [Member] | Apr. 27, 2012 2011 ATM Program [Member] | Mar. 31, 2012 2011 ATM Program [Member]
Total net consideration | $ 435,911,000 | $ 3,795,000 | $ 3,794,600 | $ 27,600,000 | $ 44,291,700
Common shares sold |  |  | 71,300 | 400,000 | 704,200
Average price per common share sold |  |  | $ 54.06 | $ 65.23 | $ 63.89

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