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Earnings Per Common Share (Shares Excluded from Computation of Diluted EPS) (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive shares excluded from computation of diluted EPS 1 2 1
Participating securities 0 0 0
Restricted Stock Awards [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive shares excluded from computation of diluted EPS 1 2 1