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Earnings 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]        
Number of antidilutive shares excluded from computation of earnings per share (in shares) 934,067 809,518 934,067 809,518