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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 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
March 31,
 
 
 
 
 
2013
 
2012
Net income
 
 
 
 
$
17,511

 
$
21,245

Weighted average common shares outstanding
 
 
 
 
73,260

 
72,854

Dilutive effect of stock-based awards
 
 
 
 
522

 
536

Shares used in computing diluted earnings per share
 
 
 
 
73,782

 
73,390

Basic earnings per share
 
 
 
 
$
0.24

 
$
0.29

Diluted earnings per share
 
 
 
 
$
0.24

 
$
0.29