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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Basic weighted-average common shares outstanding 28,449,303 28,133,432 28,349,362 28,025,805
Effect of dilutive shares 528,444 384,010 557,995 504,874
Diluted weighted-average common shares outstanding 28,977,747 28,517,442 28,907,357 28,530,679