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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Basic And Diluted Earnings Per Share
The computation of basic and diluted earnings per share is shown below (in thousands, except per share amounts).
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2017
 
2016
 
2017
 
2016
Net income
$
23,219

 
$
18,306

 
$
39,238

 
$
38,398

Weighted average common shares outstanding
72,227

 
72,048

 
72,209

 
72,036

Dilutive effect of stock-based awards
265

 
318

 
260

 
313

Shares used in computing diluted earnings per share
72,492

 
72,366

 
72,469

 
72,349

Basic earnings per share
$
0.32

 
$
0.25

 
$
0.54

 
$
0.53

Diluted earnings per share
$
0.32

 
$
0.25

 
$
0.54

 
$
0.53