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Net Income Per Common Share
 12 Months Ended
Dec. 31, 2013
Net Income Per Common Share  
Net Income Per Common Share

Note C. Net Income Per Common Share

        Basic net income per common share is computed by dividing net income attributable to SP Plus Corporation by the weighted average number of shares of common stock outstanding during the period. Diluted net income per common share is based upon the weighted average number of shares of common stock outstanding at period end, consisting of incremental shares assumed to be issued upon exercise of stock options and the incremental shares assumed to be issued under performance share and restricted stock unit arrangements, using the treasury-stock method.

        A reconciliation of the basic weighted average common shares outstanding to diluted weighted average common shares outstanding is as follows:

 
   Year Ended December 31,  
 
   2013   2012   2011  
 
   (In thousands except for
share and per share data)
  

Net income attributable to SP Plus Corporation

   $ 12,089   $ 1,340   $ 17,098  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               

Basic weighted average common shares outstanding

     21,902,870     17,179,606     15,703,595  

Dilutive impact of share-based awards

     346,714     310,598     344,284  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Diluted weighted average common shares outstanding

     22,249,584     17,490,204     16,047,879  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               

Net income per common share:

                    

Basic

   $ 0.55   $ 0.08   $ 1.09  

Diluted

   $ 0.54   $ 0.08   $ 1.07  

        There were no potential shares of common stock attributable to stock options excluded from net income per common share calculation because their effect would be anti-dilutive.