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Earnings Per Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Earnings Per Share | 11. Earnings Per Share The following table sets forth the computations of basic and diluted earnings per share:
| Year ended December 31,
| 2020 |  | 2019 |  | 2018
Net income | $ | 355,766 |  | $ | 350,158 |  | $ | 176,553
Shares: |  |  |  |  |  |  |  |
Weighted-average number of common shares outstanding (for basic calculation) |  | 27,917 |  |  | 27,740 |  |  | 27,823
Dilutive stock awards |  | 499 |  |  | 555 |  |  | 139
Weighted-average number of common shares outstanding (for diluted calculation) |  | 28,416 |  |  | 28,295 |  |  | 27,962
Basic earnings per share | $ | 12.74 |  | $ | 12.62 |  | $ | 6.35
Diluted earnings per share | $ | 12.52 |  | $ | 12.38 |  | $ | 6.31
The following stock awards were excluded from the calculation of diluted earnings per share:
| Year ended December 31,
| 2020 |  | 2019 |  | 2018
Stock awards subject to performance conditions |  | 87 |  |  | 81 |  |  | 95
Stock awards that were antidilutive |  | 57 |  |  | 139 |  |  | 1,741
Total stock awards excluded from diluted earnings per share |  | 144 |  |  | 220 |  |  | 1,836

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