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Earnings Per Share (Potentially Dilutive Shares Excluded From The Denominator For The Purpose Of Computing Diluted Earnings Per Share) (Details) - shares
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially Dilutive Securities Excluded from the Denominator 2,516,122 2,319,421
Unvested Stock Awards And LTIP Units Outstanding [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially Dilutive Securities Excluded from the Denominator 51,878 202,129