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NET INCOME PER SHARE (Tables)
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
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,
 
 
 
2018
 
2017
 
Basic net income per share:
 
 
 
 
 
 
 
Net income applicable to common stockholders
 
$
21,272
 
$
20,173
 
Weighted average common shares outstanding
 
 
57,793
 
 
60,143
 
Basic net income per share
 
$
0.37
 
$
0.34
 
 
 
 
 
 
 
 
 
Diluted net income per share:
 
 
 
 
 
 
 
Net income applicable to common stockholders
 
$
21,272
 
$
20,173
 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding
 
 
57,793
 
 
60,143
 
Dilutive shares from assumed conversion of convertible senior notes
 
 
1,789
 
 
1,683
 
Dilutive stock options and restricted stock
 
 
1,268
 
 
1,564
 
Diluted weighted average common shares outstanding
 
 
60,850
 
 
63,390
 
Diluted net income per share
 
$
0.35
 
$
0.32