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Basis of Presentation (Details 2)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Revenue Recognition        
Revenue retention percentage     10.00%  
Stock options and Restricted stock
       
Income Per Common Share        
Antidilutive securities excluded from the computation of earnings per share (in shares) 1.1 1.2 1.2 0.6