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Common Shares of Beneficial Interest (Tables)
 6 Months Ended
Jun. 30, 2016
Equity [Abstract]  
Schedule of ATM Equity Program
The following shares were sold under the ATM equity offering program (in thousands, except per share amounts):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2016
 
2015
 
2016
 
2015
Shares sold
2,792

 
320

 
3,277
 
1,129

Weighted average price per share
$
38.32

 
$
35.91

 
$
38.16

 
$
36.18

Gross proceeds
$
106,992

 
$
11,476

 
$
125,058

 
$
40,836