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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares |  |  | 0 |  |
Net income (loss)—diluted |  | $ 208,949 | $ (27,342) | $ 323,435 | $ 48,915
Dilutive effect of share-based compensation arrangements (2) | [1] | 3,854 | 0 | 3,692 | 3,896
Adjusted average common shares outstanding—diluted |  | 217,830 | 215,152 | 218,741 | 220,474
Net income (loss)—diluted |  | $ 0.96 | $ (0.13) | $ 1.48 | $ 0.22
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Net income (loss)—basic |  | $ 208,949 | $ (27,342) |  |
Net income |  | $ 208,949 | $ (27,342) | $ 323,435 | $ 49,130
Average common shares outstanding - basic |  | 213,976 | 215,152 | 215,049 | 215,054
Net income per share - basic |  | $ 0.98 | $ (0.13) | $ 1.50 | $ 0.23
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 | $ 0 | $ 0 | $ (215)
Dilutive effect of Convertible Senior Notes |  | 0 | 0 | 0 | 922
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 | 0 | 0 | 602
Stock Compensation Plan [Member] |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Shares of common stock equivalents |  | 484 | 5,975 | 351 | 442
Convertible Debt Securities [Member] |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |
Shares of common stock equivalents |  | 0 | 509 | 0 | 0
[1] | There were no dilutive shares for the three months ended June 30, 2017, as a result of our net loss for the period. The following number of shares of our common stock equivalents issued under our share-based compensation arrangements and convertible debt, if any, were not included in the calculation of diluted net income (loss) per share because they were anti-dilutive: Three Months EndedJune 30, Six Months EndedJune 30,(In thousands)2018 2017 2018 2017Shares of common stock equivalents484 5,975 351 442Shares of Convertible Senior Notes due 2017— 509 — —
[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 six months ended June 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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