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Note 2 - Net Income Per Share Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Net income—diluted |  | $ 142,797 | $ 65,142 | $ 466,232 | $ 114,057
Dilutive effect of share-based compensation arrangements | [1] | 4,593 | 4,096 | 4,284 | 4,027
Adjusted average common shares outstanding—diluted |  | 217,902 | 219,391 | 218,783 | 220,230
Net income (loss) per share—diluted |  | $ 0.66 | $ 0.30 | $ 2.13 | $ 0.52
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Net income—basic |  | $ 142,797 | $ 65,142 | $ 466,232 | $ 114,272
Average common shares outstanding - basic |  | 213,309 | 215,279 | 214,499 | 215,194
Net income (loss) per share - basic |  | $ 0.67 | $ 0.30 | $ 2.17 | $ 0.53
Convertible Debt | Convertible Senior Notes Due 2019 |  |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Adjustment for dilutive Convertible Senior Notes due 2019, net of tax | [2] | $ 0 | $ 0 | $ 0 | $ (215)
Dilutive effect of Convertible Senior Notes |  | 0 | 0 | 0 | 611
Convertible Debt | Convertible Senior Notes Due 2017 |  |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Dilutive effect of Convertible Senior Notes |  | 0 | 16 | 0 | 398
Stock Compensation Plan [Member] |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Shares of common stock equivalents |  | 338 | 676 | 338 | 440
[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 (loss) per share because they were anti-dilutive:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(In thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Shares of common stock equivalents | 338 |  |  | 676 |  |  | 338 |  |  | 440 |
[2] | As applicable, includes coupon interest, amortization of discount and fees, and other changes in income that would result from the assumed conversion. Included in the nine months ended September 30, 2017 is a benefit related to our adjustment of estimated accrued expense to actual amounts, resulting from the January 2017 settlement of our obligations on the remaining Convertible Senior Notes due 2019.

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