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Financial Instruments and Risk Management - Carrying Value and Fair Value of Financial Instruments (Details) - CAD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
FVTPL    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial liabilities $ (134,020) $ (26,792)
Liabilities, at fair value (134,020) (26,792)
FVTPL | Financial Derivatives | Level 2    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial liabilities (134,020) (26,792)
Liabilities, at fair value (134,020) (26,792)
Amortized cost    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial liabilities (1,570,390) (1,938,044)
Liabilities, at fair value (1,615,095) (1,568,257)
Amortized cost | Trade and other payables | Level 1    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial liabilities (190,692) (155,955)
Liabilities, at fair value (190,692) (155,955)
Amortized cost | Credit Facilities | Level 1    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial liabilities (505,171) (649,221)
Liabilities, at fair value (506,514) (651,173)
Amortized cost | Long-term notes | Level 1    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial liabilities (874,527) (1,132,868)
Liabilities, at fair value (917,889) (761,129)
FVTPL    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial assets 8,654 5,057
Financial assets, at fair value 8,654 5,057
FVTPL | Level 2    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial assets 8,654 5,057
Financial assets, at fair value 8,654 5,057
Amortized cost    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial assets 173,409 107,477
Financial assets, at fair value 173,409 107,477
Amortized cost | Trade and Other Receivables | Level 1    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial assets 173,409 107,477
Financial assets, at fair value $ 173,409 $ 107,477