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Earnings per share (Tables)
9 Months Ended
Sep. 30, 2019
Earnings Per Share  
Weighted average number of common shares outstanding

    Three months     Nine months  
    ended September 30,     ended September 30,  
    2019     2018     2019     2018  
Issued common shares at beginning of period     69,718,706       60,742,923       64,676,256       56,378,306  
Effect of shares issued     255,435       776,449       3,819,664       2,920,675  
Weighted average number of common shares outstanding – basic     69,974,141       61,519,372       68,495,920       59,298,981  
                                 
Weighted average number of shares outstanding – diluted     69,974,141       61,519,372       68,495,920       59,298,981