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Share-based compensation - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
performanceFactor
shares
Dec. 31, 2020
USD ($)
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of shares reserved for future grants of stock options and share appreciation rights (in shares) | shares 3,634,629  
Liabilities from share-based payment transactions $ 68,634 $ 71,913
SARs and TSARs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Maximum term 7 years  
Vesting rate 33.33%  
Fair value of share-based payment transactions $ 27,800  
Liabilities from share-based payment transactions 26,100  
Intrinsic value of liabilities from share-based payment transactions $ 1,700  
Weighted average remaining vesting period 1 year 6 months  
Expense from share-based payment transactions with employees $ 13,500 33,100
Expense (recovery) from share-based payment transactions with employees, effect of change in share price $ (20,500) 27,200
Performance Share Units (PSU) New Plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Maximum term 3 years  
Number of performance factors | performanceFactor 2  
Deferred, Restricted and Performance Share Units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Fair value of share-based payment transactions $ 52,700  
Liabilities from share-based payment transactions 42,400  
Intrinsic value of liabilities from share-based payment transactions $ 10,400  
Weighted average remaining vesting period 1 year 7 months 6 days  
Expense from share-based payment transactions with employees $ 12,200 22,000
Expense (recovery) from share-based payment transactions with employees, effect of change in share price $ (2,300) 11,400
Stock Options    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Maximum term 7 years  
Vesting rate 33.33%  
Expense from share-based payment transactions with employees $ 100 $ 100
Bottom of range | Performance Share Units (PSU) New Plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation arrangement vesting rights, percentage 0.00%  
Top of range | Performance Share Units (PSU) New Plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation arrangement vesting rights, percentage 200.00%