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Weighted Average Shares | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Weighted Average Shares | Weighted Average Shares Weighted-average shares were calculated as follows (in thousands):
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Basic weighted-average common shares outstanding | 176,463 |  |  | 173,489 |  |  | 171,194 |
Effect of dilutive stock awards | 3,453 |  |  | 3,103 |  |  | 4,075 |
Diluted weighted-average common and common-equivalent shares outstanding | 179,916 |  |  | 176,592 |  |  | 175,269 |
Stock options to purchase 497,504, 4,371,194, and 5,735,608 shares of common stock, on a weighted-average basis, were outstanding in 2021, 2020, and 2019, respectively, but were not included in the calculation of dilutive net income per share because they were anti-dilutive. Restricted stock units totaling 605, 3,826, and 13,092 shares of common stock, on a weighted-average basis, were outstanding in 2021, 2020, and 2019, respectively, but were not included in the calculation of dilutive net income per share because they were anti-dilutive.

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