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Earnings Per Share - Anti-dilutive Shares (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable        
Net dilutive potential common shares issuable (shares) 154 187 154 299
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) 154 187 154 205
On exercise of options and vesting of performance-based 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 0 89
On settlement of employee stock purchase plan shares        
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable        
Net dilutive potential common shares issuable (shares) 0 0 0 5