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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2012
Earnings Per Share [Abstract]  
Computation Of Basic And Diluted Earnings Per Share

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Three Months Ended September 30,

 

Nine Months Ended September 30,

 

2012

 

2011

 

2012

 

2011

 

 

 

 

 

 

 

 

 

 

 

 

Net income

$
37,710 

 

$
22,304 

 

$
98,619 

 

$
57,118 

Shares for basic and diluted calculation:

 

 

 

 

 

 

 

 

 

 

 

Average shares used in basic computation

 
53,601 

 

 
52,367 

 

 
53,471 

 

 
52,610 

Dilutive effect of stock options and units

 
9,453 

 

 
10,785 

 

 
9,346 

 

 
10,564 

Average shares used in dilutive computation:

 
63,054 

 

 
63,152 

 

 
62,817 

 

 
63,174 

Net income per share:

 

 

 

 

 

 

 

 

 

 

 

Basic

$
0.70 

 

$
0.43 

 

$
1.84 

 

$
1.09 

Diluted

$
0.60 

 

$
0.35 

 

$
1.57 

 

$
0.90 

 

 

(1)  Diluted earnings per share is computed on the basis of the weighted average number of shares of common stock plus the effect of dilutive potential common shares outstanding during the period using the treasury stock method. Diluted earnings per share include stock options and units.