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EARNINGS PER SHARE (Tables)
 6 Months Ended
Jun. 30, 2017
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)
2017
 
2016
 
2017
 
2016
Basic earnings per share:
 
 
 
 
 
 
 
Net income
$
13,902

 
$
11,407

 
$
28,001

 
$
21,786

Weighted-average common shares
29,720

 
28,850

 
29,589

 
28,765

Basic earnings per share
$
0.47

 
$
0.40

 
$
0.95

 
$
0.76

Diluted earnings per share: (1)
 
 
 
 
 
 
 
Net income
$
13,902

 
$
11,407

 
$
28,001

 
$
21,786

Weighted-average common shares
29,720

 
28,850

 
29,589

 
28,765

Effect of dilutive awards:
 
 
 
 
 
 
 
Employee stock plans
734

 
572

 
781

 
596

Diluted weighted-average common shares
30,454

 
29,422

 
30,370

 
29,361

Diluted earnings per share
$
0.46

 
$
0.39

 
$
0.92

 
$
0.74

_______________
(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 2017 and 2016 calculations as the shares were not contingently issuable as of the end of the reporting periods.