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Earnings Per Share (Weighted Average Shares Oustanding Used in Calculating Basic and Diluted Net Income Per Share) (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]        
Basic weighted-average common shares outstanding 28,135,705 27,792,469 28,062,438 27,753,015
Effect of dilutive shares 516,637 566,808 550,188 513,074
Diluted weighted-average common shares outstanding 28,652,342 28,359,277 28,612,626 28,266,089