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Investment in partnership - Income Statement Financial Data (Details) - CAD CAD in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |
Revenues | CAD 292,557 | CAD 213,180
Gross profit (i) | 39,647 | 32,343
Income (loss) before income taxes | 6,468 | (494)
Net loss and comprehensive loss(ii) | 5,264 | (445)
Partnership Interest |  |
Schedule of Equity Method Investments [Line Items] |  |
Revenues | 4,310 | 0
Gross profit (i) | 3,908 | 0
Income (loss) before income taxes | (401) | 0
Net loss and comprehensive loss(ii) | CAD (401) | CAD 0

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