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Share Based Payments (Summary Of Unvested Share Awards Issued To Trustees) (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Annual Retainer [Member] | Issued 12-30-2014 [Member]    
Unvested Share Awards [Abstract]    
Shares Issued (in shares) 3,215  
Share Price on date of grant (in dollars per share) $ 29.00  
Vesting Period 1 year  
Vesting Schedule (in hundredths) 100.00%  
Shares Vested (in shares)   93,000
Multi-Year LTIP Trustee [Member]    
Unvested Share Awards [Abstract]    
Shares Vested (in shares) 6,005 3,502
Unearned Compensation $ 67,000 $ 127,000
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  
Unearned Compensation $ 48,000 $ 73,000
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 1,334
Unearned Compensation $ 19,000 $ 38,000
Multi-Year LTIP Trustee [Member] | Issued 12-28-2012 [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) 3,000 2,168
Unearned Compensation   $ 16,000