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Common Shares (Tables)
 6 Months Ended
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