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Earnings Per Share - Narrative (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Anti-dilutive shares 9,203,129 9,174,585 9,203,129 9,174,585