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Weighted Average Shares | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Weighted Average Shares | Weighted Average Shares Weighted-average shares were calculated as follows (in thousands):
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Basic weighted-average common shares outstanding | 172,249 |  |  | 173,407 |  |  | 176,463 |
Effect of dilutive stock awards | 1,150 |  |  | 1,462 |  |  | 3,453 |
Diluted weighted-average common and common-equivalent shares outstanding | 173,399 |  |  | 174,869 |  |  | 179,916 |
Stock options to purchase 6,854,092, 4,715,104, and 497,504 shares of common stock, on a weighted-average basis, were outstanding in 2023, 2022, and 2021, respectively, but were not included in the calculation of dilutive net income per share because they were anti-dilutive. Restricted stock units totaling 365, 26,079, and 605 that will be settled in shares of common stock to the extent they vest, on a weighted-average basis, were outstanding in 2023, 2022, and 2021, respectively, but were not included in the calculation of dilutive net income per share because they were anti-dilutive. No PRSUs were excluded in the calculation of dilutive net income per share in 2023, 2022, and 2021 as PRSUs were not anti-dilutive on a weighted-average basis.

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