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Note 3 - Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income-basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 672,309 |  | $ 606,011 |  | $ 121,088
Net income —diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 672,309 |  | $ 606,011 |  | $ 120,873
Average common shares outstanding—basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 208,773 |  | 214,267 |  | 215,321
Dilutive effect of stock-based compensation arrangements | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,567 |  | 4,286 |  | 4,305
Adjusted average common shares outstanding—diluted |  | 205,165 |  | 208,691 |  | 213,603 |  | 218,343 |  | 217,883 |  | 217,902 |  | 217,830 |  | 219,883 |  | 210,340 |  | 218,553 |  | 220,406
Net income per share—basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.22 |  | $ 2.83 |  | $ 0.56
Net income per share—diluted |  | $ 0.79 | [2] | $ 0.83 | [2] | $ 0.78 | [2] | $ 0.78 | [2] | $ 0.64 | [2] | $ 0.66 | [2] | $ 0.96 | [2] | $ 0.52 | [2] | $ 3.20 | [2] | $ 2.77 | [2] | $ 0.55
Stock Compensation Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ant-dilutive shares - Shares of common stock equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 221 |  | 337 |  | 353
Convertible Debt | Convertible Senior Notes Due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment for dilutive Convertible Senior Notes due 2019, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  | $ (215)
Convertible Debt | Convertible Senior Notes Due 2017 and 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dilutive effect of Convertible Senior Notes due 2017 and 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 780
[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 |
[2] | Diluted net income per share is computed independently for each period presented. Consequently, the sum of the quarters may not equal the total net income per share for the year.

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