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Common Shares (Tables) | 6 Months Ended
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Jun. 30, 2012
2010 and 2011 ATM Programs [Member] |
Activity Under At-The-Market Share Offering Program | The following table presents activity under our 2010 and 2011 ATM programs for the periods presented (in thousands, except per share amounts):
| Three Months Ended |  | Six Months Ended
| June 30, 2012 |  | June 30, 2011 |  | June 30, 2012 |  | June 30, 2011
Total net consideration | $ | 83,836.3 |  |  | $ | 33,331.6 |  |  | $ | 128,128.0 |  |  | $ | 37,126.1 |
Common shares sold | 1,267.1 |  |  | 550.4 |  |  | 1,971.4 |  |  | 621.7 |
Average price per share | $ | 67.19 |  |  | $ | 61.88 |  |  | $ | 66.01 |  |  | $ | 60.98 |
2012 ATM Program [Member] |
Activity Under At-The-Market Share Offering Program | The following table presents activity under our 2012 ATM program for the periods presented (in thousands, except per share amounts):
| Three and Six Months Ended
| June 30, 2012
Total net consideration | $ | 84,711.8 |
Common shares sold | 1,305.5 |
Average price per share | $ | 65.93 |

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