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Net Income (Loss) Per Share - Narrative (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]        
Antidilutive securities excluded from computation of earnings per share, amount (in shares) 5,008 6,860 5,086 6,860