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EARNINGS PER SHARE (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Earnings per share calculation
A summary of the earnings per share calculation is as follows:    
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
(In thousands, except per share amounts)
2016
 
2015
 
2016
 
2015
Basic earnings per share:
 
 
 
 
 
 
 
Net income
$
11,265

 
$
8,590

 
$
20,108

 
$
14,933

Weighted-average common shares
28,850

 
29,368

 
28,765

 
29,339

Basic earnings per share
$
0.39

 
$
0.29

 
$
0.70

 
$
0.51

Diluted earnings per share: (1)
 
 
 
 
 
 
 
Net income
$
11,265

 
$
8,590

 
$
20,108

 
$
14,933

Weighted-average common shares
28,850

 
29,368

 
28,765

 
29,339

Effect of dilutive awards:
 
 
 
 
 
 
 
Employee stock plans
572

 
666

 
596

 
736

Diluted weighted-average common shares
29,422

 
30,034

 
29,361

 
30,075

Diluted earnings per share
$
0.38

 
$
0.29

 
$
0.68

 
$
0.50

_______________
(1)
The Company includes the shares underlying performance-based awards in the calculation of diluted earnings per share if the performance conditions have been satisfied as of the end of the reporting period and excludes such shares when the necessary conditions have not been met. The Company has excluded the shares underlying the outstanding performance-based awards in the 2016 and 2015 calculations as the shares were not contingently issuable as of the end of the reporting periods.