Common Shares of Beneficial Interest (Tables)

9 Months Ended

Sep. 30, 2016

Equity [Abstract]

Schedule of ATM Equity Program

The following shares were sold under the ATM equity offering programs (in thousands, except per share amounts):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Shares sold	188		—		3,465		1,129
Weighted average price per share	$	41.67	$	—	$	38.35	$	36.18
Gross proceeds	$	7,827	$	—	$	132,884	$	40,836