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Net Income Per Common Share
9 Months Ended
Sep. 30, 2011
Net Income Per Common Share [Abstract] 
Net Income Per Common Share
Net Income Per Common Share
Net income per common share, as shown on the Condensed Consolidated Statements of Income, is determined on the basis of the weighted average number of common shares outstanding during the period as follows:
                                 
    Three Months Ended     Nine Months Ended  
    September 30,     September 30,  
    2011     2010     2011     2010  
Weighted average common shares outstanding
                               
Basic
    34,354,210       35,310,744       34,938,806       35,301,608  
Dilutive effect of stock options and restricted stock
    106,742       71,667       89,607       59,131  
 
                       
Weighted average common shares outstanding diluted
    34,460,952       35,382,411       35,028,413       35,360,739  
 
                       
Options to purchase 692,810 and 1,159,679 shares of common stock that were outstanding for the three months and nine months ended September 30, 2011, respectively, were not included in the computation of diluted earnings per share for these respective periods as the exercise price of these options was greater than the average market price of common shares, and their effect would be anti-dilutive. Options to purchase 1,570,196 that were outstanding at September 30, 2010 were not included in the computation of diluted earnings per share amounts in 2010 as the exercise price of these options was greater than the average market price of common shares, and their effect would be anti-dilutive.