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Net Income Per Share - Additional Information (Details) (Stock Options)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Stock Options
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stock options not included in the earnings per share calculation (in shares) 584,194 695,868 619,890 693,930