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Earnings per Common Share (Narrative) (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Dilutive awards 0 0 0 0
Restricted Stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Participating securities allocated a portion of income 43,961 38,938 40,888 34,844
Restricted Stock Units (RSUs) [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potentially dilutive securities     169,767  
Employee Stock Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potentially dilutive securities       400,785
Antidilutive securities excluded from computation of earnings per share, amount 571,221 426,196 506,223 367,033