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NET INCOME PER SHARE (Tables)
 6 Months Ended
Jun. 30, 2016
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
 
Six Months Ended
 
 
 
June 30,
 
June 30,
 
 
 
2016
 
2015
 
2016
 
2015
 
Basic net income per share:
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income applicable to common stockholders
 
$
35,531
 
$
28,649
 
$
63,055
 
$
39,122
 
Weighted average common shares outstanding
 
 
64,834
 
 
67,591
 
 
64,936
 
 
68,158
 
Basic net income per share
 
$
0.55
 
$
0.42
 
$
0.97
 
$
0.57
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Diluted net income per share:
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income applicable to common stockholders
 
$
35,531
 
$
28,649
 
$
63,055
 
$
39,122
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding
 
 
64,834
 
 
67,591
 
 
64,936
 
 
68,158
 
Dilutive shares from assumed conversion of convertible senior notes
 
 
1,057
 
 
2,047
 
 
529
 
 
1,888
 
Dilutive stock options and restricted stock
 
 
1,224
 
 
1,056
 
 
1,205
 
 
1,076
 
Diluted weighted average common shares outstanding
 
 
67,115
 
 
70,694
 
 
66,670
 
 
71,122
 
Diluted net income per share
 
$
0.53
 
$
0.41
 
$
0.95
 
$
0.55