Common Shares (Tables)

3 Months Ended

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