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PER SHARE OF COMMON STOCK (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Per share results have been calculated based on the average number of common shares outstanding. 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,
 
 
 
2017
 
2016
 
2015
 
Basic net income per share:
 
 
 
 
 
 
 
 
 
 
Net income applicable to common stockholders
 
$
111,422
 
$
119,433
 
$
104,289
 
Weighted average common shares outstanding
 
 
59,358
 
 
63,729
 
 
67,201
 
Basic net income per share
 
$
1.88
 
$
1.87
 
$
1.55
 
 
 
 
 
 
 
 
 
 
 
 
Diluted net income per share:
 
 
 
 
 
 
 
 
 
 
Net income applicable to common stockholders
 
$
111,422
 
$
119,433
 
$
104,289
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding
 
 
59,358
 
 
63,729
 
 
67,201
 
Dilutive shares from assumed conversion of convertible senior notes
 
 
1,726
 
 
794
 
 
1,128
 
Dilutive stock options and restricted stock
 
 
1,515
 
 
1,239
 
 
1,039
 
Diluted weighted average common shares outstanding
 
 
62,599
 
 
65,762
 
 
69,368
 
Diluted net income per share
 
$
1.78
 
$
1.82
 
$
1.50