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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
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,
 
2018
 
2017
 
2018
 
2017
Net income
$
38,264

 
$
23,219

 
$
66,071

 
$
39,238

Weighted average common shares outstanding
72,144

 
72,227

 
72,289

 
72,209

Dilutive effect of stock-based awards
232

 
265

 
233

 
260

Shares used in computing diluted earnings per share
72,376

 
72,492

 
72,522

 
72,469

Basic earnings per share
$
0.53

 
$
0.32

 
$
0.91

 
$
0.54

Diluted earnings per share
$
0.53

 
$
0.32

 
$
0.91

 
$
0.54