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Earnings Per Share
 9 Months Ended
Sep. 30, 2012
Earnings Per Share [Abstract]  
Earnings Per Share

(6) The following table reconciles the numerators and denominators used in the calculation of basic and diluted earnings per share (EPS):

 

 

 

 

 

 

 

 

 

 

 

 

Three Months Ended
September 30,

 

Nine Months Ended
September 30,

Numerators:

2012

2011

 

2012

2011

Numerator for both basic and diluted EPS, net income

$
41,877,083 

$
43,397,064 

 

$
128,988,206 

$
124,202,115 

 

 

 

 

 

 

 

 

 

 

Denominators:

 

 

 

 

 

 

 

 

 

Denominator for basic EPS, weighted-average shares outstanding

 
143,027,693 

 
142,681,780 

 

 
143,415,077 

 
142,276,965 

 

 

   

 

 

 

 

 

 

 

Potentially dilutive shares resulting from stock plans

 
556,682 

 
1,633,240 

 

 
1,002,142 

 
1,859,434 

Denominator for diluted EPS

 
143,584,375 

 
144,315,020 

 

 
144,417,219 

 
144,136,399 

 

 

 

 

 

 

 

 

 

 

Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive

 
5,332,661 

 
1,716,832 

 

 
3,289,832 

 
1,097,397