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Note 2 - Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The calculation of basic and diluted net income per share was as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(In thousands, except per-share amounts) | 2017 |  | 2016 |  | 2017 |  | 2016
Net income—basic | $ | 65,142 |  |  | $ | 82,803 |  |  | $ | 114,272 |  |  | $ | 247,164 |
Adjustment for dilutive Convertible Senior Notes due 2019, net of tax (1) | — |  |  | 848 |  |  | (215 | ) |  | 5,151 |
Net income—diluted | $ | 65,142 |  |  | $ | 83,651 |  |  | $ | 114,057 |  |  | $ | 252,315 |
Average common shares outstanding—basic | 215,279 |  |  | 214,387 |  |  | 215,194 |  |  | 210,858 |
Dilutive effect of Convertible Senior Notes due 2017 (2) | 16 |  |  | 178 |  |  | 398 |  |  | 71 |
Dilutive effect of Convertible Senior Notes due 2019 | — |  |  | 8,274 |  |  | 611 |  |  | 16,897 |
Dilutive effect of share-based compensation arrangements (2) | 4,096 |  |  | 3,129 |  |  | 4,027 |  |  | 2,846 |
Adjusted average common shares outstanding—diluted | 219,391 |  |  | 225,968 |  |  | 220,230 |  |  | 230,672 |
Net income per share: |  |  |  |  |  |  |
Basic | $ | 0.30 |  |  | $ | 0.39 |  |  | $ | 0.53 |  |  | $ | 1.17 |
Diluted | $ | 0.30 |  |  | $ | 0.37 |  |  | $ | 0.52 |  |  | $ | 1.09 |
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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 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.
(2) | 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 Ended September 30, |  | Nine Months Ended September 30,
(In thousands) | 2017 |  | 2016 |  | 2017 |  | 2016
Shares of common stock equivalents | 676 |  |  | 1,045 |  |  | 440 |  |  | 1,045 |
Shares of Convertible Senior Notes due 2017 | — |  |  | — |  |  | — |  |  | 1,902 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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