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Note 3 - Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The calculation of basic and diluted net income per share is as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(In thousands, except per-share amounts) | 2020 |  | 2019 |  | 2020 |  | 2019
Net income —basic and diluted | $ | 135,103 |  |  | $ | 173,438 |  |  | $ | 245,613 |  |  | $ | 511,125 |
Average common shares outstanding—basic (1) | 193,176 |  |  | 203,107 |  |  | 196,120 |  |  | 208,561 |
Dilutive effect of share-based compensation arrangements (2) | 980 |  |  | 5,584 |  |  | 1,127 |  |  | 5,402 |
Adjusted average common shares outstanding—diluted | 194,156 |  |  | 208,691 |  |  | 197,247 |  |  | 213,963 |
Net income per share: |  |  |  |  |  |  |
Basic | $ | 0.70 |  |  | $ | 0.85 |  |  | $ | 1.25 |  |  | $ | 2.45 |
Diluted | $ | 0.70 |  |  | $ | 0.83 |  |  | $ | 1.25 |  |  | $ | 2.39 |
______________________ (1)Includes the impact of fully vested shares under our share-based compensation programs. (2)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) | 2020 |  | 2019 |  | 2020 |  | 2019
Shares of common stock equivalents | 710 |  |  | — |  |  | 1,046 |  |  | 160 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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