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EARNINGS PER SHARE (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
 
2018
 
2017
Numerator:
 

 
 

Net income
$
60,824

 
$
55,844

Denominator (shares in 000's):
 

 
 

Basic weighted average shares outstanding
65,579

 
65,688

Effect of dilutive securities - Stock options and awards
864

 
895

Diluted weighted average shares outstanding
66,443

 
66,583

Basic earnings per share
$
0.93

 
$
0.85

Diluted earnings per share
$
0.92

 
$
0.84