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Earnings per Share - Narrative (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share [Abstract]        
Antidilutive securities excluded from calculation of EPS (in shares) 28,351,580 20,200,950 28,342,309 20,200,950