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Earnings Per Share - Anti-dilutive Shares (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable      
Net dilutive potential common shares issuable (shares) 31 167 154
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) 31 96 154
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)   54  
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)   17