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EARNINGS PER SHARE (Tables)
9 Months Ended
Sep. 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 September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Numerator:
 

 
 

 
 

 
 

Net income
$
70,539

 
$
106,126

 
$
200,227

 
$
223,322

Denominator (shares in 000's):
 

 
 

 
 

 
 

Basic weighted average shares outstanding
64,821

 
65,806

 
65,245

 
65,769

Effect of dilutive securities - Stock options and awards
831

 
896

 
810

 
910

Diluted weighted average shares outstanding
65,652

 
66,702

 
66,055

 
66,679

Basic earnings per share
$
1.09

 
$
1.61

 
$
3.07

 
$
3.40

Diluted earnings per share
$
1.07

 
$
1.59

 
$
3.03

 
$
3.35