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Earnings per Share
6 Months Ended
Jun. 30, 2011
Earnings per Share [Abstract]  
Earnings per Share
Note 2.  Earnings per Share
Basic earnings per share is determined by dividing net income attributable to controlling interest by the weighted average number of common shares outstanding during each period.  Diluted earnings per share include the potential dilutive effects of options, restricted stock units and shares held in the Company's Supplemental Executive Retirement Plan.

The following table sets forth the computation of basic and diluted earnings per share:

   
For the Three Months Ended
June 30,
  
For the Six Months Ended
June 30,
 
   
2011
  
2010
  
2011
  
2010
 
Numerator:
            
Net income attributable to controlling interest
 $14,086,000  $10,308,000  $24,230,000  $19,102,000 
Denominator:
                
Denominator for basic earnings per share
  22,576,222   22,507,078   22,571,192   22,490,431 
Effect of dilutive securities:
                
Employee stock options and restricted stock units
  315,172   225,736   285,060   211,234 
Supplemental Executive Retirement Plan
  100,523   99,971   99,455   98,558 
Denominator for diluted earnings per share
  22,991,917   22,832,785   22,955,707   22,800,223 
                  
Net income attributable to controlling
  interest per share:
                
Basic
 $0.62  $0.46  $1.07  $0.85 
Diluted
 $0.61  $0.45  $1.06  $0.84 

A total of 323 and 1,072 options were antidilutive for the three months ended June 30, 2011 and 2010, respectively.  A total of 698 and 1,437 options were antidilutive for the six months ended June 30, 2011 and 2010, respectively.  Antidilutive options are not included in the diluted earnings per share computation.