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

Basic earnings per common share is calculated by dividing net income available to common stockholders by the weighted average number of common shares outstanding. Diluted earnings per share is calculated by dividing net income by the weighted average shares outstanding plus share equivalents that would arise from the exercise of share options and the vesting of restricted stock. There were no employee stock options excluded from the calculation of diluted earnings per share for the nine month period ended September 30, 2012. For the nine month period ended September 30, 2011, employee stock options totaling 68,556 were excluded from the calculation of diluted earnings per share, as they were anti-dilutive. The computation of basic and diluted earnings per common share for the nine month periods ended September 30, 2012 and 2011 are as follows:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2012
 
2011
 
2012
 
2011
Numerator:
 

 
 

 
 
 
 
Net income
$
3,816,936

 
$
3,379,501

 
$
10,531,560

 
$
8,516,214

Denominator:
 

 
 

 
 
 
 
Denominator for basic earnings per share-weighted-average shares
22,383,168

 
22,153,007

 
22,272,952

 
22,124,803

Effect of dilutive securities:
 

 
 

 
 
 
 
Employee stock options/Unvested Restricted Stock
512,106

 
417,548

 
548,994

 
440,721

Denominator for dilutive earnings per share
22,895,274

 
22,570,555

 
22,821,946

 
22,565,524

Basic net income per common share
$
0.17

 
$
0.15

 
$
0.47

 
$
0.38

Diluted net income per common share
$
0.17

 
$
0.15

 
$
0.46

 
$
0.38