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Weighted Average Shares | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Weighted Average Shares | Weighted Average Shares Weighted-average shares were calculated as follows (in thousands):
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Basic weighted-average common shares outstanding | 173,489 |  |  | 171,194 |  |  | 172,333 |
Effect of dilutive stock awards | 3,103 |  |  | 4,075 |  |  | 5,073 |
Diluted weighted-average common and common-equivalent shares outstanding | 176,592 |  |  | 175,269 |  |  | 177,406 |
Stock options to purchase 4,371,194, 5,735,608, and 2,650,164 shares of common stock, on a weighted-average basis, were outstanding in 2020, 2019, and 2018, respectively, but were not included in the calculation of dilutive net income per share because they were anti-dilutive. Restricted stock units totaling 3,826 and 13,092 shares of common stock, on a weighted-average basis, were outstanding in 2020 and 2019, respectively, but were not included in the calculation of dilutive net income per share because they were anti-dilutive. There were no anti-dilutive restricted stock units outstanding, on a weighted-average basis, in 2018.

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