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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
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Stock Compensation Plan [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share amount (in shares) 1.6 2.3 1.6 2.3