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EARNINGS PER SHARE (Tables)
 6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Earnings per share calculation
A summary of the earnings per share calculation is as follows (in thousands, except per share amounts):        
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2015
 
2014
 
2015
 
2014
Basic earnings per share:
 
 
 
 
 
 
 
Net income
$
8,590

 
$
16,716

 
$
14,933

 
$
29,079

Weighted-average common shares
29,368

 
30,310

 
29,339

 
30,275

Basic earnings per share
$
0.29

 
$
0.55

 
$
0.51

 
$
0.96

Diluted earnings per share: (1)
 
 
 
 
 
 
 
Net income
$
8,590

 
$
16,716

 
$
14,933

 
$
29,079

Weighted-average common shares
29,368

 
30,310

 
29,339

 
30,275

Effect of dilutive awards:

 

 

 

Employee stock plans
666

 
800

 
736

 
875

Diluted weighted-average common shares
30,034

 
31,110

 
30,075

 
31,150

Diluted earnings per share
$
0.29

 
$
0.54

 
$
0.50

 
$
0.93

_______________ 
(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 2015 and 2014 awards in the 2015 and 2014 calculations, respectively, as those shares were not contingently issuable as of the end of the period.