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EARNINGS PER SHARE (Tables)
6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Schedule of computation of basic and diluted earnings per share
The following table sets forth the computation of basic and diluted earnings per share:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Numerator:
 

 
 

 
 

 
 

Net income
$
68,864

 
$
61,352

 
$
129,688

 
$
117,196

Denominator (shares in 000's):
 

 
 

 
 

 
 

Basic weighted average shares outstanding
65,337

 
65,811

 
65,458

 
65,750

Effect of dilutive securities - Stock options and awards
784

 
932

 
799

 
916

Diluted weighted average shares outstanding
66,121

 
66,743

 
66,257

 
66,666

Basic earnings per share
$
1.05

 
$
0.93

 
$
1.98

 
$
1.78

Diluted earnings per share
$
1.04

 
$
0.92

 
$
1.96

 
$
1.76