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Net Income Per Share
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Net Income Per Share
Net Income Per Share
Basic net income per share is computed by dividing net income for the period by the weighted-average number of shares outstanding during the period. Diluted net income per share is computed by dividing net income for the period by the weighted-average number of shares, less shares repurchased, plus, if dilutive, potential common stock outstanding during the period. Potential common stock includes the effect of outstanding dilutive stock options, restricted stock awards and restricted stock units computed using the treasury stock method. The anti-dilutive weighted-average dilutive shares related to stock award plans are excluded from the computation of the diluted net income per share.
The calculation of basic and diluted net income per share is as follows:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(In thousands, except per share data)
Net income
$
20,605

 
$
603

 
$
30,760

Weighted-average shares outstanding — basic
37,483

 
36,156

 
35,857

Add: Dilutive effect of employee stock plans
1,229

 
708

 
861

Weighted-average shares outstanding — diluted
38,712

 
36,864

 
36,718

Net income per share — basic
$
0.55

 
$
0.02

 
$
0.86

Net income per share — diluted
$
0.53

 
$
0.02

 
$
0.84

Anti-dilutive weighted-average shares related to stock award plans
501

 
1,345

 
555