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Common Shares (Tables)

9 Months Ended

Sep. 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								Nine Months Ended
	September 30, 2012				September 30, 2011				September 30, 2012				September 30, 2011
Total net consideration	$	—			$	32,736.8			$	128,128.0			$	69,862.9
Common shares sold	—				506.2				1,971.4				1,127.9
Average price per share	$	—			$	65.76			$	66.01			$	63.13

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 Months Ended				Nine Months Ended
	September 30, 2012				September 30, 2012
Total net consideration	$	88,915.9			$	173,627.6
Common shares sold	1,302.5				2,607.9
Average price per share	$	69.34			$	67.63