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Common Shares (Tables) | 3 Months Ended
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Mar. 31, 2011 2010 ATM Program [Member] | Mar. 31, 2012 2011 ATM Program [Member]
Activity Under At-The-Market Share Offering Program | The following table presents activity under our 2010 ATM program for the period presented (in thousands, except per share amount):
| Three Months Ended
| March 31, 2011
Total net consideration | $ | 3,794.6 |
Common shares sold | 71.3 |
Average price per share | $ | 54.06 |
| The following table presents activity under our 2011 ATM program for the period presented (in thousands, except per share amount):
| Three Months Ended
| March 31, 2012
Total net consideration | $ | 44,291.7 |
Common shares sold | 704.2 |
Average price per share | $ | 63.89 |

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- Definition Activity Under ATM Share Offering Program. + References No definition available. + Details
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