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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)