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Common Shares Of Beneficial Interest Common Shares Of Beneficial Interest (Tables)
 12 Months Ended
Dec. 31, 2016
Class of Stock Disclosures [Abstract]  
Schedule of Market Equity Distributions
The following shares were sold under the ATM equity offering programs (in thousands, except per share amounts):
 
 
Year Ended December 31,
 
 
2016
 
2015
Shares sold
 
3,465

 
1,129

Weighted average price per share
 
$
38.35

 
$
36.18

Gross proceeds
 
$
132,884

 
$
40,836