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Net Income Per Share (Tables)
6 Months Ended
Jun. 30, 2012
Net Income Per Share [Abstract]  
Summary of antidilutive securities outstanding were not included in the computation of diluted EPS
                                 
    Three months ended June 30,     Six months ended June 30,  
    2012     2011     2012     2011  

Stock options

    850,308       1,721,735       868,990       1,753,883  

Restricted stock units

    71,296       461,589       72,060       467,403