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Note 2 - Net Income Per Share | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Net Income Per Share | Net Income Per Share Basic net income per share is computed by dividing net income by the weighted-average number of common shares outstanding, while diluted net income per share is computed by dividing net income attributable to common shareholders by the sum of the weighted-average number of common shares outstanding and the weighted-average number of dilutive potential common shares. Dilutive potential common shares relate to our share-based compensation arrangements and our outstanding convertible senior notes. The calculation of basic and diluted net income per share was as follows:
| Three Months Ended March 31,
(In thousands, except per-share amounts) | 2018 |  | 2017
Net income—basic | $ | 114,486 |  |  | $ | 76,472 |
Adjustment for dilutive Convertible Senior Notes due 2019, net of tax (1) | — |  |  | (215 | )
Net income—diluted | $ | 114,486 |  |  | $ | 76,257 |
Average common shares outstanding—basic | 215,967 |  |  | 214,925 |
Dilutive effect of Convertible Senior Notes due 2017 | — |  |  | 701 |
Dilutive effect of Convertible Senior Notes due 2019 | — |  |  | 1,854 |
Dilutive effect of share-based compensation arrangements (2) | 3,916 |  |  | 4,017 |
Adjusted average common shares outstanding—diluted | 219,883 |  |  | 221,497 |
Net income per share: |  |  |
Basic | $ | 0.53 |  |  | $ | 0.36 |
Diluted | $ | 0.52 |  |  | $ | 0.34 |
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(1) | 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 three months ended March 31, 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.
(2) | 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) | 2018 |  | 2017
Shares of common stock equivalents | 170 |  |  | 445 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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