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Employee Plans (Tables)
12 Months Ended
Dec. 31, 2013
Employee Plans [Abstract]  
Summary of information regarding the Common Shares issued under the ESPP
The following table summarizes information regarding the Common Shares issued under the ESPP (the net proceeds noted below were contributed to ERPOP in exchange for OP Units):
 
Year Ended December 31,
 
2013
 
2012
 
2011
 
(Amounts in thousands except share and per share amounts)
Shares issued
73,468
 
110,054
 
113,107
Issuance price ranges
$44.26 – $48.17
 
$46.33 – $51.78
 
$44.04 – $51.19
Issuance proceeds
$3,401
 
$5,399
 
$5,262