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NET INCOME PER SHARE (Tables)
 9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
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
September 30,
 
Nine Months Ended
September 30,
 
2019
 
2018
 
2019
 
2018
Basic net income per share:
 
 
 
 
 
 
 
Net income applicable to common stockholders
$
25,460

 
$
4,664

 
$
71,200

 
$
57,837

Weighted average common shares outstanding
54,413

 
56,798

 
54,975

 
57,486

Basic net income per share
$
0.47

 
$
0.08

 
$
1.30

 
$
1.01

 
 
 
 
 
 
 
 
Diluted net income per share:
 
 
 
 
 
 
 
Net income applicable to common stockholders
$
25,460

 
$
4,664

 
$
71,200

 
$
57,837

 
 
 
 
 
 
 
 
Weighted average common shares outstanding
54,413

 
56,798

 
54,975

 
57,486

Dilutive shares from assumed conversion of convertible senior notes
—

 
—

 
—

 
676

Dilutive stock options and restricted stock
606

 
944

 
527

 
1,056

Diluted weighted average common shares outstanding
55,019

 
57,742

 
55,502

 
59,218

Diluted net income per share
$
0.46

 
$
0.08

 
$
1.28

 
$
0.98