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Shareholders' equity - Common Shares (Details)
3 Months Ended
Mar. 31, 2018
$ / shares
shares
Common shares  
Shareholders' equity  
Shares issued 186,043,985
Shares issued - DRIP 113,654
Preferred shares  
Shareholders' equity  
Shares issued 0
Shares, par value (dollars per share) | $ / shares $ 0