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PER SHARE OF COMMON STOCK (Tables)
 12 Months Ended
Dec. 31, 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):
 
 
 
Years Ended December 31,
 
 
 
2015
 
2014
 
2013
 
Basic net income per share
 
 
 
 
 
 
 
 
 
 
Net income applicable to common stockholders
 
$
104,289
 
$
60,930
 
$
46,529
 
Undistributed earnings allocated to participating securities
 
 
-
 
 
(481)
 
 
(457)
 
Net income applicable to common stockholders excluding amounts applicable to participating securities
 
$
104,289
 
$
60,449
 
$
46,072
 
Weighted average common shares outstanding
 
 
67,201
 
 
68,895
 
 
68,460
 
Basic net income per share
 
$
1.55
 
$
0.88
 
$
0.67
 
 
 
 
 
 
 
 
 
 
 
 
Diluted net income per share:
 
 
 
 
 
 
 
 
 
 
Net income applicable to common stockholders
 
$
104,289
 
$
60,930
 
$
46,529
 
Undistributed earnings allocated to participating securities
 
 
-
 
 
(481)
 
 
(457)
 
Net income applicable to common stockholders excluding amounts applicable to participating securities
 
$
104,289
 
$
60,449
 
$
46,072
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding
 
 
67,201
 
 
68,895
 
 
68,460
 
Dilutive shares from assumed conversion of convertible senior notes
 
 
1,128
 
 
1,354
 
 
63
 
Dilutive stock options and restricted stock
 
 
1,039
 
 
814
 
 
558
 
Diluted weighted average common shares outstanding
 
 
69,368
 
 
71,063
 
 
69,081
 
Diluted net income per share
 
$
1.50
 
$
0.85
 
$
0.67