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Common Shares (Tables) | 3 Months Ended
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Mar. 31, 2012 2010 and 2011 ATM Programs [Member] | Mar. 31, 2013 2012 ATM Program [Member]
Activity Under At-The-Market Share Offering Program | The following table presents activity under our 2011 ATM program for the three months ended March 31, 2012 (in thousands, except per share amounts):
|  | Three Months Ended
|  | March 31, 2012
Total net consideration |  | $ | 44,291.7 |
Common shares sold |  | 704.2 |
Average price per share |  | $ | 63.89 |
| The following table presents activity under our 2012 ATM program for the three months ended March 31, 2013 (in thousands, except per share amounts):
|  | Three Months Ended
|  | March 31, 2013
Total net consideration |  | $ | 9,365.5 |
Common shares sold |  | 135.7 |
Average price per share |  | $ | 70.63 |

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