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Earnings Per Common Share (Narrative) (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Antidilutive Securities Excluded from Computation Of Earnings Per Share [Line Items]        
Anti-dilutive options 0 0 0 0
Minimum [Member]        
Antidilutive Securities Excluded from Computation Of Earnings Per Share [Line Items]        
Options expiration date     February 24, 2020  
Maximum [Member]        
Antidilutive Securities Excluded from Computation Of Earnings Per Share [Line Items]        
Options expiration date     September 19, 2022