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Net Income (Loss) Per Share (Narrative of Antidilutive Securities Excluded from Computation of Earnings Per Share) (Details) - shares
shares in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Stock Compensation Plan    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share amount (in shares) 0.7 1.8