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Long-Term Notes (Details)
$ in Thousands
12 Months Ended
Feb. 05, 2020
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2021
USD ($)
Feb. 05, 2020
USD ($)
Disclosure of detailed information about borrowings [line items]            
Long-term notes   $ 874,527   $ 1,132,868    
Repurchased and cancelled principal notes   251,969   833,672    
Early redemption expense   4,858   6,617    
Net proceeds from issuance of long-term notes $ 652,200 0   652,150    
Principal            
Disclosure of detailed information about borrowings [line items]            
Long-term notes   885,920   1,147,950    
Loan repayments   249,400        
Changes in reported amount of U.S. denominated debt   12,600        
Unamortized debt issuance costs            
Disclosure of detailed information about borrowings [line items]            
Long-term notes   (11,393)   (15,082)    
5.625% notes due June 1, 2024            
Disclosure of detailed information about borrowings [line items]            
Notional amount         $ 200,000,000 $ 200,000,000
Repurchased and cancelled principal notes     $ 200,000,000      
Early redemption expense   $ 1,900        
5.625% notes due June 1, 2024 | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate   5.625%     5.625% 5.625%
5.625% notes due June 1, 2024 | Principal            
Disclosure of detailed information about borrowings [line items]            
Long-term notes   $ 253,120   510,200    
8.75% Notes Due April 1, 2027            
Disclosure of detailed information about borrowings [line items]            
Notional amount         $ 500,000,000 $ 500,000,000
Transaction costs $ 12,500          
8.75% Notes Due April 1, 2027 | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate   8.75%     8.75% 8.75%
8.75% Notes Due April 1, 2027 | Principal            
Disclosure of detailed information about borrowings [line items]            
Long-term notes   $ 632,800   $ 637,750