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Note 3 - Net Income Per Share | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Earnings Per Share [Text Block] | Net Income Per Share The calculation of basic and diluted net income per share is as follows:
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
(In thousands, except per-share amounts) |  |  |  |  |
Net income—basic | $ | 672,309 |  |  | $ | 606,011 |  |  | $ | 121,088 |
Adjustment for dilutive Convertible Senior Notes due 2019, net of tax | — |  |  | — |  |  | (215 | )
Net income —diluted | $ | 672,309 |  |  | $ | 606,011 |  |  | $ | 120,873 |
Average common shares outstanding—basic | 208,773 |  |  | 214,267 |  |  | 215,321 |
Dilutive effect of Convertible Senior Notes due 2017 and 2019 | — |  |  | — |  |  | 780 |
Dilutive effect of stock-based compensation arrangements (1) | 1,567 |  |  | 4,286 |  |  | 4,305 |
Adjusted average common shares outstanding—diluted | 210,340 |  |  | 218,553 |  |  | 220,406 |
Net income per share: |  |  |  |  |
Basic | $ | 3.22 |  |  | $ | 2.83 |  |  | $ | 0.56 |
Diluted | $ | 3.20 |  |  | $ | 2.77 |  |  | $ | 0.55 |
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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:
| Year Ended December 31,
(In thousands) | 2019 |  | 2018 |  | 2017
Shares of common stock equivalents | 221 |  |  | 337 |  |  | 353 |

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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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