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NET INCOME PER SHARE (Tables)
 6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Calculation of Basic and Diluted Net Income Per Share
The calculation of basic and diluted net income per share is determined using net income applicable to common stockholders as the numerator and the number of shares included in the denominator as follows (in thousands, except per share amounts):
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
 
 
2015
 
2014
 
2015
 
2014
 
Basic net income per share:
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income applicable to common stockholders
 
$
28,649
 
$
16,239
 
$
39,122
 
$
23,535
 
Undistributed earnings allocated to participating securities
 
 
-
 
 
(88)
 
 
-
 
 
(189)
 
Net income applicable to common stockholders excluding amounts applicable to participating securities
 
$
28,649
 
$
16,151
 
$
39,122
 
$
23,346
 
Weighted average common shares outstanding
 
 
67,591
 
 
68,938
 
 
68,158
 
 
68,805
 
Basic net income per share
 
$
0.42
 
$
0.23
 
$
0.57
 
$
0.34
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Diluted net income per share:
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income applicable to common stockholders
 
$
28,649
 
$
16,239
 
$
39,122
 
$
23,535
 
Undistributed earnings allocated to participating securities
 
 
-
 
 
(88)
 
 
-
 
 
(189)
 
Net income applicable to common stockholders excluding amounts applicable to participating securities
 
$
28,649
 
$
16,151
 
$
39,122
 
$
23,346
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding
 
 
67,591
 
 
68,938
 
 
68,158
 
 
68,805
 
Dilutive shares from assumed conversion of convertible senior notes
 
 
2,047
 
 
1,877
 
 
1,888
 
 
1,734
 
Dilutive stock options and restricted stock
 
 
1,056
 
 
742
 
 
1,076
 
 
785
 
Diluted weighted average common shares outstanding
 
 
70,694
 
 
71,557
 
 
71,122
 
 
71,324
 
Diluted net income per share
 
$
0.41
 
$
0.23
 
$
0.55
 
$
0.33