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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2016
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,
 
2016
 
2015
 
2016
 
2015
Net income
$
18,306

 
$
31,848

 
$
38,398

 
$
54,990

Weighted average common shares outstanding
72,048

 
71,945

 
72,036

 
72,005

Dilutive effect of stock-based awards
318

 
479

 
313

 
477

Shares used in computing diluted earnings per share
72,366

 
72,424

 
72,349

 
72,482

Basic earnings per share
$
0.25

 
$
0.44

 
$
0.53

 
$
0.76

Diluted earnings per share
$
0.25

 
$
0.44

 
$
0.53

 
$
0.76