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EARNINGS PER SHARE (Tables)
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Reconciliation of basic and diluted earnings per share computations
The following are computations of basic and diluted earnings per share (in thousands except for per share amounts):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2018
 
2017
 
2018
 
2017
Numerator for basic and diluted earnings per share:
 

 
 

 
 
 
 
Net income
$
30,747

 
$
25,880

 
$
18,116

 
$
4,487

 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 
 
 
Basic shares outstanding
56,410

 
57,190

 
56,304

 
57,226

Dilutive effect of equity-based compensation awards
95

 
146

 
95

 
123

Dilutive shares outstanding
56,505

 
57,336

 
56,399

 
57,349

 
 
 
 
 
 
 
 
Basic income per share:
$
0.55

 
$
0.45

 
$
0.32

 
$
0.08

 
 

 
 

 
 

 
 

Diluted income per share:
$
0.54

 
$
0.45

 
$
0.32

 
$
0.08