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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
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |
Net income (loss)—diluted |  | $ 140,461 | $ 170,957
Dilutive effect of share-based compensation arrangements | [1] | 1,658 | 4,806
Adjusted average common shares outstanding—diluted |  | 201,819 | 218,343
Net income (loss) per share—diluted |  | $ 0.70 | $ 0.78
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Net income (loss) - basic |  | $ 140,461 | $ 170,957
Average common shares outstanding - basic | [2] | 200,161 | 213,537
Net income (loss) per share - basic |  | $ 0.70 | $ 0.80
Stock Compensation Plan |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |
Shares of common stock equivalents |  | 132 | 169
[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:
| Three Months Ended March 31,
(In thousands) | 2020 |  | 2019
Shares of common stock equivalents | 132 |  |  | 169 |
[2] | Includes the impact of fully vested shares under our share-based compensation programs.

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