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Net Income Per Share | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Net Income Per Share | Note O—Net Income Per Share The calculation of net income per share for the three years ended December 31, 2021, 2020 and 2019, are reflected in the following table (in thousands, except per share amounts):
|  | Year Ended December 31,
|  | 2021 |  | 2020 |  | 2019
Net income |  | $ | 598,626 |  |  | $ | 306,276 |  |  | $ | 454,433 |
Basic: |  |  |  |  |  |
Weighted average shares |  | 110,482 |  |  | 112,729 |  |  | 115,656 |
Diluted: |  |  |  |  |  |
Weighted average shares |  | 110,482 |  |  | 112,729 |  |  | 115,656 |
Dilutive effect of potential common shares |  | 1,236 |  |  | 589 |  |  | 755 |
Diluted weighted average shares |  | 111,718 |  |  | 113,318 |  |  | 116,411 |
Net income per share: |  |  |  |  |  |
Basic |  | $ | 5.42 |  |  | $ | 2.72 |  |  | $ | 3.93 |
Diluted |  | $ | 5.36 |  |  | $ | 2.70 |  |  | $ | 3.90 |
Potential common shares include the dilutive effect of unvested performance-based restricted stock, restricted stock which contains forfeitable rights to dividends, and stock units.

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