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Financial Instruments and Risk Management - Liquidity Risk (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2022
USD ($)
Jul. 25, 2022
CAD ($)
Jun. 01, 2022
USD ($)
Dec. 31, 2021
USD ($)
Feb. 05, 2020
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Credit Facilities $ 383,031 $ 505,171          
Credit facilities available 1,200,000 1,000,000          
Outstanding letters of credit 15,700 15,000          
Trade and other payables 281,404 190,692          
Credit facilities 383,031 505,171          
Long-term notes 547,598 874,527          
Cost              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Credit Facilities $ 385,394 $ 506,514          
8.75% Notes Due April 1, 2027              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Notional amount     $ 409.8     $ 500.0  
8.75% Notes Due April 1, 2027 | Fixed interest rate              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Borrowings, interest rate 8.75%   8.75%       8.75%
5.625% notes due June 1, 2024              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Notional amount     $ 0.0   $ 200.0 $ 200.0  
5.625% notes due June 1, 2024 | Fixed interest rate              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Borrowings, interest rate 5.625%   5.625%        
LC Facility              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Outstanding letters of credit       $ 20,000      
Liquidity risk              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Trade and other payables $ 281,404            
Credit facilities 385,394            
Long-term notes 554,597            
Interest on long-term notes 206,340            
Lease obligations 6,760            
Financial liabilities 1,434,495            
Less than 1 year | Liquidity risk              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Trade and other payables 272,195            
Credit facilities 0            
Long-term notes 0            
Interest on long-term notes 48,527            
Lease obligations 3,641            
Financial liabilities 324,363            
1-3 years | Liquidity risk              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Trade and other payables 9,209            
Credit facilities 0            
Long-term notes 0            
Interest on long-term notes 97,054            
Lease obligations 2,822            
Financial liabilities 109,085            
3-5 years | Liquidity risk              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Trade and other payables 0            
Credit facilities 385,394            
Long-term notes 554,597            
Interest on long-term notes 60,759            
Lease obligations 297            
Financial liabilities 1,001,047            
Beyond 5 years | Liquidity risk              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Trade and other payables 0            
Credit facilities 0            
Long-term notes 0            
Interest on long-term notes 0            
Lease obligations 0            
Financial liabilities $ 0