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Net Income Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Basic and Diluted Net Income Per Share
The basic and diluted net income per share calculation for the years ended December 31, 2018, December 31, 2017, and December 31, 2016 was as follows:
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(In thousands, except per share data)
Net income
$
37,729

 
$
30,518

 
$
9,756

Weighted-average shares outstanding — basic
39,242

 
37,483

 
36,156

Effect of dilutive securities from stock award plans
1,317

 
1,229

 
708

Weighted-average shares outstanding — diluted
40,559

 
38,712

 
36,864

Net income per share - basic
$
0.96

 
$
0.81

 
$
0.27

Net income per share - diluted
$
0.93

 
$
0.79

 
$
0.26

 
 
 
 
 
 
Anti-dilutive weighted-average shares related to stock award plans
1,279

 
501

 
1,345