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Note 2 - Net Income Per Share
 9 Months Ended
Sep. 30, 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, if any.
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)
2018
 
2017
 
2018
 
2017
Net income—basic
$
142,797

 
$
65,142

 
$
466,232

 
$
114,272

Adjustment for dilutive Convertible Senior Notes due 2019, net of tax (1) 
—

 
—

 
—

 
(215
)
Net income—diluted
$
142,797

 
$
65,142

 
$
466,232

 
$
114,057

 
 
 
 
 
 
 
 
Average common shares outstanding—basic
213,309

 
215,279

 
214,499

 
215,194

Dilutive effect of Convertible Senior Notes due 2017
—

 
16

 
—

 
398

Dilutive effect of Convertible Senior Notes due 2019
—

 
—

 
—

 
611

Dilutive effect of share-based compensation arrangements (2) 
4,593

 
4,096

 
4,284

 
4,027

Adjusted average common shares outstanding—diluted
217,902


219,391

 
218,783

 
220,230

 
 
 
 
 
 
 
 
Net income per share:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic
$
0.67

 
$
0.30

 
$
2.17

 
$
0.53

 
 
 
 
 
 
 
 
Diluted
$
0.66

 
$
0.30

 
$
2.13

 
$
0.52

______________________
(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 were not included in the calculation of diluted net income (loss) per share because they were anti-dilutive:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(In thousands)
2018
 
2017
 
2018
 
2017
Shares of common stock equivalents
338

 
676

 
338

 
440