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Long term debt - Convertible Debenture (Details) - Convertible debentures
Mar. 15, 2017
CAD ($)
$ / shares
Debt Instrument [Line Items]  
Face amount of long term debt | $ $ 40,000,000.0
Conversion interest rate 5.50%
Conversion price (in CAD per share) | $ / shares $ 10.85
Conversion ratio 0.0921659
Threshold percentage of share price for conversion 125.00%
Redemption price as a percentage of the principal amount 101.00%