Common Shares (Tables)

9 Months Ended

Sep. 30, 2013

2012 ATM Program [Member]

Sep. 30, 2012

2010 and 2011 ATM Programs [Member]

Activity Under At-The-Market Share Offering Program

The following table presents activity under our 2012 ATM program for the three and nine months ended September 30, 2013 and 2012 (in thousands, except per share amounts):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2013		2012		2013		2012
Total net consideration	$	—	$	88,915.9	$	40,097.6	$	173,627.6
Common shares sold	—		1,302.5		555.1		2,607.9
Average price per share	$	—	$	69.34	$	73.73	$	67.63

The following table presents activity under our 2011 ATM program for the three and nine months ended September 30, 2012 (in thousands, except per share amounts):

	Three Months Ended		Nine Months Ended
	September 30, 2012		September 30, 2012
Total net consideration	$	—	$	128,128.0
Common shares sold	—		1,971.4
Average price per share	$	—	$	66.01