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Share Based Payments (Summary Of Unvested Share Awards Issued To Trustees) (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Unvested Share Awards [Abstract]    
Shares Issued (in shares) 655,120  
Shares Vested (in shares) 338,855 206,708
Unearned Compensation $ 3,034 $ 2,484
Annual Retainer [Member] | Issued 03-30-2016 [Member]    
Unvested Share Awards [Abstract]    
Shares Issued (in shares) 5,289  
Share Price on date of grant (in dollars per share) $ 21.11  
Vesting Period 9 months  
Vesting Schedule (in hundredths) 100.00%  
Unearned Compensation $ 74  
Multi-year LTIP Trustee [Member]    
Unvested Share Awards [Abstract]    
Shares Vested (in shares) 3,005 3,005
Unearned Compensation $ 90 $ 67
Multi-year LTIP Trustee [Member] | Issued 03-30-2016 [Member]    
Unvested Share Awards [Abstract]    
Shares Issued (in shares) 2,500  
Vesting Period 3 years  
Vesting Schedule (in hundredths) 33.00%  
Unearned Compensation $ 44  
Multi-year LTIP Trustee [Member] | Issued 12-30-2014 [Member]    
Unvested Share Awards [Abstract]    
Shares Issued (in shares) 2,500  
Vesting Period 3 years  
Vesting Schedule (in hundredths) 33.00%  
Shares Vested (in shares) 835 835
Unearned Compensation $ 36 $ 48
Multi-year LTIP Trustee [Member] | Issued 12-27-2013 [Member]    
Unvested Share Awards [Abstract]    
Shares Issued (in shares) 3,000  
Vesting Period 3 years  
Vesting Schedule (in hundredths) 33.00%  
Shares Vested (in shares) 2,170 2,170
Unearned Compensation $ 10 $ 19