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Earnings Per Share - Anti-dilutive Shares (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable        
Net dilutive potential common shares issuable (shares) 22 174 33 193
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) 22 95 33 111
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)   57   57
On settlement of ESPP shares        
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable        
Net dilutive potential common shares issuable (shares)   22   25