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Consolidated Statements of Comprehensive Loss - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Statement Of Comprehensive Income [Abstract]    
Net earnings (loss) $ 6,618 $ (294,270)
Unrealized gain on translation of assets and liabilities of operations denominated in foreign currency (106,781) 175,630
Foreign exchange loss on net investment hedge with U.S. denominated debt, net of tax 79,022 (145,226)
Comprehensive loss $ (21,141) $ (263,866)