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Earnings Per Share
 3 Months Ended
Mar. 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 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 three months ended March 31, 2021 and 2020:
(in thousands)20212020
Weighted Average Common Shares Outstanding – Basic41,455 40,217 
Effect of Dilutive Securities:
Stock Performance Awards143 126 
Stock Awards85 83 
Employee Stock Purchase Plan Shares and Other17 18 
Dilutive Effect of Potential Common Shares245 227 
Weighted Average Common Shares Outstanding – Diluted41,700 40,444 
The amount of shares excluded from diluted weighted-average common shares outstanding because such shares were anti-dilutive was not material for the three months ended March 31, 2021 and 2020.