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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2012
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,
 
2012
 
2011
 
2012
 
2011
Net income
$
30,680

 
$
27,518

 
$
51,925

 
$
43,811

Weighted average common shares outstanding
72,859

 
72,794

 
72,857

 
72,749

Dilutive effect of stock-based awards
553

 
445

 
544

 
441

Shares used in computing diluted earnings per share
73,412

 
73,239

 
73,401

 
73,190

Basic earnings per share
$
0.42

 
$
0.38

 
$
0.71

 
$
0.60

Diluted earnings per share
$
0.42

 
$
0.38

 
$
0.71

 
$
0.60