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Share Based Payments (Summary Of Unvested Share Awards Issued To Trustees) (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Unvested Share Awards [Abstract]    
Shares Issued (in shares) 655,120  
Shares Vested (in shares) 280,553 234,706
Unearned Compensation $ 3,774,000 $ 2,484,000
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 1 year  
Vesting Schedule (in hundredths) 100.00%  
Unearned Compensation $ 112,000  
Multi-year LTIP Trustee [Member]    
Unvested Share Awards [Abstract]    
Shares Vested (in shares) 3,005 3,005
Unearned Compensation $ 104,000 $ 67,000
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 $ 48,000  
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) 835 835
Unearned Compensation $ 42,000 $ 48,000
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 2,170
Unearned Compensation $ 14,000 $ 19,000