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Earnings per share - Narrative (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 0 13,166 0 13,166