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Long term debt - Convertible Debenture (Details) - Convertible debentures | Mar. 15, 2017 CAD ($) $ / shares
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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%

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