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Net Income Per Share | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Net Income Per Share | Net Income Per ShareThe calculation of net income per share for the three and nine months ended September 30, 2021 and 2020 is reflected in the following table (in thousands, except per share amounts):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Net income | $ | 170,871 |  |  | $ | 75,749 |  |  | $ | 430,682 |  |  | $ | 211,860 |
Basic: |  |  |  |  |  |  |
Weighted average shares | 110,176 |  |  | 112,809 |  |  | 110,816 |  |  | 112,953 |
Diluted: |  |  |  |  |  |  |
Weighted average shares | 110,176 |  |  | 112,809 |  |  | 110,816 |  |  | 112,953 |
Dilutive effect of potential common shares | 1,314 |  |  | 546 |  |  | 1,138 |  |  | 491 |
Diluted weighted average shares | 111,490 |  |  | 113,355 |  |  | 111,954 |  |  | 113,444 |
Net income per share: |  |  |  |  |  |  |
Basic | $ | 1.55 |  |  | $ | .67 |  |  | $ | 3.89 |  |  | $ | 1.88 |
Diluted | $ | 1.53 |  |  | $ | .67 |  |  | $ | 3.85 |  |  | $ | 1.87 |

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