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Consolidated Statements of Comprehensive Loss - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Statement Of Comprehensive Income [Abstract]    
Net loss $ (294,270) $ (132,036)
Unrealized gain (loss) on translation of assets and liabilities of operations denominated in foreign currency 175,630 (146,545)
Foreign exchange gain (loss) on net investment hedge with U.S. denominated debt, net of tax (145,226) 121,699
Comprehensive loss $ (263,866) $ (156,882)