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Earnings per Share (Narrative) (Details) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share Awards [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive shares, excluded from computation of diluted net loss per share 4,000,000 3,800,000 3,100,000