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Earnings Per Share | 12 Months Ended
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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) | 2021 |  | 2020 |  | 2019
Weighted Average Common Shares Outstanding – Basic | 41,491 |  |  | 40,710 |  |  | 39,721 |
Effect of Dilutive Securities: |  |  |  |  |
Stock Performance Awards | 226 |  |  | 116 |  |  | 147 |
Restricted Stock Awards | 87 |  |  | 63 |  |  | 81 |
Employee Stock Purchase Plan Shares and Other | 14 |  |  | 16 |  |  | 5 |
Dilutive Effect of Potential Common Shares | 327 |  |  | 195 |  |  | 233 |
Weighted Average Common Shares Outstanding – Diluted | 41,818 |  |  | 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.

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