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Share Based Payments (Summary Of Unvested Share Awards Issued To Trustees) (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Unvested Share Awards [Abstract]    
Shares Issued (in shares) 693,854  
Shares Vested (in shares) 477,898 360,918
Unearned Compensation $ 1,147 $ 1,550
Board Fee Compensation [Member] | Issued 12-30-2016 [Member]    
Unvested Share Awards [Abstract]    
Shares Issued (in shares) 4,395  
Share Price on date of grant (in dollars per share) $ 21.50  
Vesting Period 12 months  
Vesting Schedule (in hundredths) 100.00%  
Unearned Compensation $ 24 $ 94
Multi-year LTIP Trustee [Member]    
Unvested Share Awards [Abstract]    
Shares Vested (in shares) 2,505 2,505
Unearned Compensation $ 109 $ 167
Multi-year LTIP Trustee [Member] | Issued 12-30-2016 [Member]    
Unvested Share Awards [Abstract]    
Shares Issued (in shares) 5,000  
Vesting Period 3 years  
Vesting Schedule (in hundredths) 33.00%  
Unearned Compensation $ 81 $ 108
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%  
Shares Vested (in shares) 835 835
Unearned Compensation $ 22 $ 35
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) 1,670 1,670
Unearned Compensation $ 6 $ 24