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Earnings Per Share
 6 Months Ended
Jun. 30, 2011
Earnings Per Share [Abstract]  
Earnings Per Share
11. Earnings Per Share
The following table sets forth the computation of basic and diluted earnings per share from continuing operations for the three and six months ended June 30, 2011 and 2010 (in thousands, except per share data).
                                 
    THREE MONTHS ENDED     SIX MONTHS ENDED  
    JUNE 30,     JUNE 30,  
    2011     2010     2011     2010  
Numerator:
                               
Income from continuing operations
  $ 6,856     $ 7,009     $ 24,980     $ 23,865  
 
                       
 
                               
Denominator:
                               
Basic
                               
Weighted average common shares outstanding
    49,615       61,448       49,469       61,479  
 
                       
Diluted
                               
Stock options (1)
    66       104       78       130  
Restricted stock awards
    132       70       188       148  
Contingent shares (2)
    145       215       145       215  
 
                       
Diluted weighted average common shares outstanding
    49,958       61,837       49,880       61,972  
 
                       
 
                               
Basic earnings per share from continuing operations
  $ 0.14     $ 0.11     $ 0.50     $ 0.39  
 
                       
Diluted earnings per share from continuing operations
  $ 0.14     $ 0.11     $ 0.50     $ 0.39  
 
                       
 
(1)   A total of 6.8 million and 6.1 million share based awards were excluded from the calculation of diluted earnings per share for the three and six months ended June 30, 2011, respectively, and a total of 5.4 million and 4.9 million share based awards were excluded from the calculation of diluted earnings per share for the three and six months ended June 30, 2010, respectively, as their exercise prices would render them anti-dilutive.
 
(2)   Contingent shares represent additional shares to be issued for purchase price earned by former owners of businesses acquired by CBIZ once future conditions have been met.