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Earnings Per Share
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
The numerator used in the calculation of both basic and diluted earnings per common share is net income. The denominator used in the calculation of basic earnings per common share is the weighted average number of common shares outstanding during the period. The denominator used in the calculation of diluted earnings per common share is derived by adjusting basic shares outstanding for the dilutive effect of potential common 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, 2020, 2019 and 2018:
(in thousands)202020192018
Weighted Average Common Shares Outstanding – Basic40,710 39,721 39,600 
Effect of Dilutive Securities:
Stock Performance Awards116 147 212 
Restricted Stock Awards63 81 78 
Employee Stock Purchase Plan Shares and Other16 5 2 
Dilutive Effect of Potential Common Shares195 233 292 
Weighted Average Common Shares Outstanding – Diluted40,905 39,954 39,892 
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, 2020, 2019 and 2018.