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Consolidated Statements of Comprehensive Loss - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Statement Of Comprehensive Income [Abstract] |  |
Net loss | $ (132,036) | $ (155,555)
Unrealized loss on translation of assets and liabilities of operations denominated in foreign currency | (146,545) | (76,608)
Foreign exchange gain on net investment hedge with U.S. denominated debt, net of tax | 121,699 | 66,963
Comprehensive loss | $ (156,882) | $ (165,200)

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