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NET INCOME PER SHARE (Tables)
 3 Months Ended
Mar. 31, 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
 
 
 
March 31,
 
 
 
2016
 
2015
 
Basic net income per share:
 
 
 
 
 
 
 
Net income applicable to common stockholders
 
$
27,524
 
$
10,474
 
Weighted average common shares outstanding
 
 
65,037
 
 
68,731
 
Basic net income per share
 
$
0.42
 
$
0.15
 
 
 
 
 
 
 
 
 
Diluted net income per share:
 
 
 
 
 
 
 
Net income applicable to common stockholders
 
$
27,524
 
$
10,474
 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding
 
 
65,037
 
 
68,731
 
Dilutive shares from assumed conversion of convertible senior notes
 
 
-
 
 
1,729
 
Dilutive stock options and restricted stock
 
 
1,187
 
 
1,095
 
Diluted weighted average common shares outstanding
 
 
66,224
 
 
71,555
 
Diluted net income per share
 
$
0.42
 
$
0.15