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Performance B.4.1. Share-based compensation - Plan awards and shares expected to vest (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
shares
Dec. 31, 2019
shares
Dec. 31, 2018
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Shares issued (in shares) (453,969) (364,157)    
Shares still expected to vest (in shares) 574,234 622,567    
2021 Performance Plan        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Initial shares granted (in shares) 451,363      
Additional shares granted (in shares) 0      
Revision for forfeitures (in shares) (17,469)      
Revision for cancellations (in shares) 0      
Total before issuances (in shares) 433,894      
Shares issued (in shares) (1,121)      
Performance conditions (in shares) 0      
Shares still expected to vest (in shares) 432,773      
Estimated cost over the vesting period | $ $ 16,000      
2021 Deferred Plan        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Initial shares granted (in shares) 536,890      
Additional shares granted (in shares) 5,824      
Revision for forfeitures (in shares) (11,790)      
Revision for cancellations (in shares) 0      
Total before issuances (in shares) 530,924      
Shares issued (in shares) (5,760)      
Performance conditions (in shares) 0      
Shares still expected to vest (in shares) 525,164      
Estimated cost over the vesting period | $ $ 19,000      
2020 Performance Plan        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Initial shares granted (in shares) 341,897      
Additional shares granted (in shares) 0      
Revision for forfeitures (in shares) (264,137)      
Revision for cancellations (in shares) 0      
Total before issuances (in shares) 77,760      
Shares issued (in shares) 0 0    
Performance conditions (in shares) 0      
Shares still expected to vest (in shares) 77,760      
Estimated cost over the vesting period | $ $ 4,000      
2020 Deferred Plan        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Initial shares granted (in shares) 370,131      
Additional shares granted (in shares) 5,928      
Revision for forfeitures (in shares) (26,815)      
Revision for cancellations (in shares) 0      
Total before issuances (in shares) 349,244      
Shares issued (in shares) (113,653) (3,571)    
Performance conditions (in shares) 0      
Shares still expected to vest (in shares) 232,020      
Estimated cost over the vesting period | $ $ 15,000      
2019 Performance Plan        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Initial shares granted (in shares) 257,601      
Additional shares granted (in shares) 0      
Revision for forfeitures (in shares) (204,649)      
Revision for cancellations (in shares) 0      
Total before issuances (in shares) 52,952      
Shares issued (in shares) 0 (17) (150)  
Performance conditions (in shares) 0      
Shares still expected to vest (in shares) 52,785      
Estimated cost over the vesting period | $ $ 3,000      
2019 Deferred Plan        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Initial shares granted (in shares) 297,856      
Additional shares granted (in shares) 43,115      
Revision for forfeitures (in shares) (31,553)      
Revision for cancellations (in shares) 0      
Total before issuances (in shares) 309,418      
Shares issued (in shares) (87,141) (96,629) (24,294)  
Performance conditions (in shares) 0      
Shares still expected to vest (in shares) 101,354      
Estimated cost over the vesting period | $ $ 18,000      
2018 Performance Plan        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Initial shares granted (in shares) 237,196      
Additional shares granted (in shares) 0      
Revision for forfeitures (in shares) (78,903)      
Revision for cancellations (in shares) (4,728)      
Total before issuances (in shares) 153,565      
Shares issued (in shares) (103,725) (304) (3,109) (97)
Performance conditions (in shares) (46,330)      
Shares still expected to vest (in shares) 0      
Estimated cost over the vesting period | $ $ 12,000      
2018 Deferred Plan        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Initial shares granted (in shares) 262,317      
Additional shares granted (in shares) 3,290      
Revision for forfeitures (in shares) (38,167)      
Revision for cancellations (in shares) 0      
Total before issuances (in shares) 227,440      
Shares issued (in shares) (118,597) (35,125) (54,971) (18,747)
Performance conditions (in shares) 0      
Shares still expected to vest (in shares) 0      
Estimated cost over the vesting period | $ $ 14,000