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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
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Basic weighted-average common shares outstanding 28,249,420 27,916,652
Effect of dilutive shares 686,610 663,545
Diluted weighted-average common shares outstanding 28,936,030 28,580,197