Common Shares (Tables)

3 Months Ended

Mar. 31, 2011

2010 ATM Program [Member]

Mar. 31, 2012

2011 ATM Program [Member]

Activity Under At-The-Market Share Offering Program

The following table presents activity under our 2010 ATM program for the period presented (in thousands, except per share amount):

	Three Months Ended
	March 31, 2011
Total net consideration	$	3,794.6
Common shares sold	71.3
Average price per share	$	54.06

The following table presents activity under our 2011 ATM program for the period presented (in thousands, except per share amount):

	Three Months Ended
	March 31, 2012
Total net consideration	$	44,291.7
Common shares sold	704.2
Average price per share	$	63.89