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Note 2 - Net Income Per Share Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Net Income (Loss) Available to Common Stockholders, Diluted |  | $ 65,142 | $ 83,651 | $ 114,057 | $ 252,315
Dilutive effect of share-based compensation arrangements (2) | [1] | 4,096 | 3,129 | 4,027 | 2,846
Adjusted average common shares outstanding—diluted |  | 219,391 | 225,968 | 220,230 | 230,672
Net income (loss)—diluted |  | $ 0.30 | $ 0.37 | $ 0.52 | $ 1.09
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Net income—basic |  | $ 65,142 | $ 82,803 | $ 114,272 | $ 247,164
Average common shares outstanding - basic |  | 215,279 | 214,387 | 215,194 | 210,858
Net income per share - basic |  | $ 0.30 | $ 0.39 | $ 0.53 | $ 1.17
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 (1) | [2] | $ 0 | $ 848 | $ (215) | $ 5,151
Dilutive effect of Convertible Senior Notes |  | 0 | 8,274 | 611 | 16,897
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 | [1] | 16 | 178 | 398 | 71
Stock Compensation Plan [Member] |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  | 676 | 1,045 | 440 | 1,045
Convertible Debt Securities [Member] |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  | 0 | 0 | 0 | 1,902
[1] | The following number of shares of our common stock equivalents issued under our share-based compensation arrangements and our convertible debt were not included in the calculation of diluted net income per share because they were anti-dilutive: Three Months EndedSeptember 30, Nine Months EndedSeptember 30,(In thousands)2017 2016 2017 2016Shares of common stock equivalents676 1,045 440 1,045Shares of Convertible Senior Notes due 2017— — — 1,902
[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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