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Net Income Per Common Share (Details 1) (Employee Stock Option [Member], USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Employee Stock Option [Member]
       
Schedule of antidilutive securities excluded from computation of earnings per share        
Number of shares (shares) 109,068 162,339 109,068 388,446
Range of exercise prices, Maximum (usd per share) $ 30.63 $ 30.63 $ 30.63 $ 30.63
Range of exercise prices, Minimum (usd per share) $ 29.57 $ 19.14 $ 29.57 $ 19.14