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Note 2 - Net Income Per Share | 9 Months Ended
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Sep. 30, 2019
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 was as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(In thousands, except per-share amounts) | 2019 |  | 2018 |  | 2019 |  | 2018
Net income—basic and diluted | $ | 173,438 |  |  | $ | 142,797 |  |  | $ | 511,125 |  |  | $ | 466,232 |
Average common shares outstanding—basic | 203,107 |  |  | 213,309 |  |  | 208,561 |  |  | 214,499 |
Dilutive effect of share-based compensation arrangements (1) | 5,584 |  |  | 4,593 |  |  | 5,402 |  |  | 4,284 |
Adjusted average common shares outstanding—diluted | 208,691 |  |  | 217,902 |  |  | 213,963 |  |  | 218,783 |
Net income per share: |  |  |  |  |  |  |
Basic | $ | 0.85 |  |  | $ | 0.67 |  |  | $ | 2.45 |  |  | $ | 2.17 |
Diluted | $ | 0.83 |  |  | $ | 0.66 |  |  | $ | 2.39 |  |  | $ | 2.13 |
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(1) | The following number of shares of our common stock equivalents issued under our share-based compensation arrangements were not included in the calculation of diluted net income per share because they were anti-dilutive:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(In thousands) | 2019 |  | 2018 |  | 2019 |  | 2018
Shares of common stock equivalents | — |  |  | 338 |  |  | 160 |  |  | 338 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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