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Earnings Per Share (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share [Abstract]        
Number of antidilutive shares excluded from computation of earnings per share (in shares) 923,306 355,338 923,306 355,338