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Earnings Per Share - Excluded Securities On Diluted Shares Calculation (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Diluted shares (as reported) 146,964 145,958 146,761 145,057
Total (in shares)       145,421
Share-based Awards        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities (in shares)       364