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Earnings Per Share (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Earnings Per Share [Abstract]    
Potentially dilutive securities included in calculation of diluted EPS (in shares) 199,376 204,080
Options to purchase common stock excluded from potentially dilutive securities (in shares) 425,100 431,190