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Note 2 - Net Income Per Share (Tables)
 3 Months Ended
Mar. 31, 2018
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
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

______________________
(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