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Earnings Per Share - Anti-dilutive Shares (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable      
Net dilutive potential common shares issuable (shares) 195 268 657
On exercise of options where exercise price is greater than average market value for the period      
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable      
Net dilutive potential common shares issuable (shares) 195 268 597
On exercise of options and vesting of restricted stock units      
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable      
Net dilutive potential common shares issuable (shares) 0 0 60