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Earnings Per Share
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
The numerator used in the calculation of both basic and diluted earnings per share is net income. The denominator used in the calculation of basic earnings per share is the weighted average number of shares outstanding during the period. The denominator used in the calculation of diluted earnings per share is derived by adjusting basic shares outstanding for the dilutive effect of potential shares outstanding, which consist of time and performance based stock awards and employee stock purchase plan shares.
The following includes the computation of the denominator for basic and diluted weighted-average shares outstanding for the years ended December 31, 2021, 2020 and 2019:
(in thousands)202120202019
Weighted Average Common Shares Outstanding – Basic41,491 40,710 39,721 
Effect of Dilutive Securities:
Stock Performance Awards226 116 147 
Restricted Stock Awards87 63 81 
Employee Stock Purchase Plan Shares and Other14 16 5 
Dilutive Effect of Potential Common Shares327 195 233 
Weighted Average Common Shares Outstanding – Diluted41,818 40,905 39,954 
The amount of shares excluded from diluted weighted-average common shares outstanding because such shares were anti-dilutive was not material for the years ended December 31, 2021, 2020 and 2019.