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Equity Incentive Plan (Tables) (Restricted share awards)
 12 Months Ended
Dec. 31, 2014
Restricted share awards
  
Equity Incentive Plan  
Summary of the non-vested shares
A summary of the non-vested shares as of December 31, 2014, 2013 and 2012 is as follows:
 
2014
 
2013
 
2012
 
Number of
Shares
 
Weighted Average
Grant Date Fair
Value
 
Number of
Shares
 
Weighted Average
Grant Date Fair
Value
 
Number of
Shares
 
Weighted Average
Grant Date Fair
Value
Unvested at January 1,
932,800

 
$
18.99

 
1,013,673

 
$
17.80

 
970,288

 
$
17.93

Granted (1)
348,234

 
24.46

 
383,187

 
21.25

 
445,176

 
17.23

Vested (1)
(537,988
)
 
19.44

 
(458,808
)
 
18.24

 
(374,913
)
 
17.46

Forfeited
(11,587
)
 
22.89

 
(5,252
)
 
20.07

 
(26,878
)
 
17.80

Unvested at December 31,
731,459

 
$
21.21

 
932,800

 
$
18.99

 
1,013,673

 
$
17.80

_______________________________________________________________________________
(1)
For the years ended December 31, 2014, 2013 and 2012, respectively, includes 4,347, 5,357 and 8,530 unrestricted shares issued in lieu of cash compensation to non-employee trustees at a weighted average grant date fair value of $29.31, $23.20 and $18.75, respectively.