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Shareholders' equity - Common Shares (Details) - $ / shares
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Common shares    
Shareholders' equity    
Shares issued 186,178,516  
Shares issued - DRIP 248,185 285,041
Preferred shares    
Shareholders' equity    
Shares issued 0  
Shares, par value (dollars per share) $ 0