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Common Shares (Tables)
 12 Months Ended
Dec. 31, 2014
Two thousand fourteen ATM program [Domain]  
Activity Under At-The-Market Share Offering Program
The following table presents activity under our 2014 ATM program for the year ended December 31, 2014:
(in thousands, except per share amounts)
Year Ended
December 31, 2014
Total net consideration
$
15,690.2

Common shares sold
209.7

Average price per share
$
76.28
2012 and 2011 Atm Programs [Domain]  
Activity Under At-The-Market Share Offering Program
The following table presents activity under our 2011 and 2012 ATM programs for the periods presented:
 
 
Year Ended December 31,
(in thousands, except per share amounts)
2014
 
2013
 
2012
Total net consideration
$
50,535.3

 
$
40,044.1

 
$
301,735.5

Common shares sold
688.3

 
555.1

 
4,579.3

Average price per share
$
74.60

 
$
73.73

 
$
66.93