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Shareholders' equity - Common Shares (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Common shares        
Shareholders' equity        
Shares issued 186,362,994   186,362,994  
Shares issued - DRIP 179,478 139,806 427,663 424,847
Preferred shares        
Shareholders' equity        
Shares issued 0   0  
Shares, par value (dollars per share) $ 0   $ 0