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Note 3 - Net Income (Loss) Per Share (Note) | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Net Income Per Share | Net Income Per Share Basic net income per share is computed by dividing net income by the weighted-average number of common shares outstanding, while diluted net income per share is computed by dividing net income attributable to common stockholders by the sum of the weighted-average number of common shares outstanding and the weighted-average number of dilutive potential common shares. Dilutive potential common shares relate to our share-based compensation arrangements. The calculation of basic and diluted net income per share is as follows.
Net income per share
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
(In thousands, except per-share amounts) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Net income—basic and diluted |  | $ | 126,412 |  |  | $ | 135,103 |  |  | $ | 407,226 |  |  | $ | 245,613 |
Average common shares outstanding—basic |  | 186,741 |  |  | 193,176 |  |  | 191,357 |  |  | 196,120 |
Dilutive effect of share-based compensation arrangements (1) |  | 1,301 |  |  | 980 |  |  | 1,545 |  |  | 1,127 |
Adjusted average common shares outstanding—diluted |  | 188,042 |  |  | 194,156 |  |  | 192,902 |  |  | 197,247 |
Net income per share: |  |  |  |  |  |  |  |
Basic |  | $ | 0.68 |  |  | $ | 0.70 |  |  | $ | 2.13 |  |  | $ | 1.25 |
Diluted |  | $ | 0.67 |  |  | $ | 0.70 |  |  | $ | 2.11 |  |  | $ | 1.25 |
(1)The following number of shares of our common stock equivalents issued under our share-based compensation arrangements are not included in the calculation of diluted net income per share because they are anti-dilutive.
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
(In thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Shares of common stock equivalents |  | — |  |  | 710 |  |  | — |  |  | 1,046 |

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