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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
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,
 
2013
 
2012
 
2013
 
2012
Net income
$
25,840

 
$
30,680

 
$
43,351

 
$
51,925

Weighted average common shares outstanding
73,022

 
72,859

 
73,140

 
72,857

Dilutive effect of stock-based awards
576

 
553

 
550

 
544

Shares used in computing diluted earnings per share
73,598

 
73,412

 
73,690

 
73,401

Basic earnings per share
$
0.35

 
$
0.42

 
$
0.59

 
$
0.71

Diluted earnings per share
$
0.35

 
$
0.42

 
$
0.59

 
$
0.71