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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, 2022
USD ($)
shares
Dec. 31, 2021
shares
Dec. 31, 2020
shares
Dec. 31, 2019
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Shares issued (in shares) (723,668) (453,969)    
Shares still expected to vest (in shares) 1,112,771 574,234    
2022 Performance Plan        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Initial shares granted (in shares) 306,641      
Additional shares granted (in shares) 0      
Number of shares for rights offering, in share-based payment arrangement (in shares) 83,926      
Revision for forfeitures (in shares) 0      
Revision for cancellations (in shares) 0      
Total before issuances (in shares) 390,567      
Shares issued (in shares) 0      
Performance conditions (in shares) 0      
Shares still expected to vest (in shares) 390,567      
Estimated cost over the vesting period | $ $ 7,000      
2022 Deferred Plan        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Initial shares granted (in shares) 865,862      
Additional shares granted (in shares) 47,588      
Number of shares for rights offering, in share-based payment arrangement (in shares) 227,947      
Revision for forfeitures (in shares) (21,990)      
Revision for cancellations (in shares) 0      
Total before issuances (in shares) 1,119,407      
Shares issued (in shares) (13,957)      
Performance conditions (in shares) 0      
Shares still expected to vest (in shares) 1,105,450      
Estimated cost over the vesting period | $ $ 20,000      
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      
Number of shares for rights offering, in share-based payment arrangement (in shares) 115,575      
Revision for forfeitures (in shares) (25,938)      
Revision for cancellations (in shares) 0      
Total before issuances (in shares) 541,000      
Shares issued (in shares) (2,071) (1,121)    
Performance conditions (in shares) 0      
Shares still expected to vest (in shares) 537,808      
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      
Number of shares for rights offering, in share-based payment arrangement (in shares) 93,375      
Revision for forfeitures (in shares) (28,130)      
Revision for cancellations (in shares) (9,250)      
Total before issuances (in shares) 598,709      
Shares issued (in shares) (160,596) (5,760)    
Performance conditions (in shares) 0      
Shares still expected to vest (in shares) 432,353      
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      
Number of shares for rights offering, in share-based payment arrangement (in shares) 20,862      
Revision for forfeitures (in shares) (265,632)      
Revision for cancellations (in shares) 0      
Total before issuances (in shares) 97,127      
Shares issued (in shares) 0 0 0  
Performance conditions (in shares) (97,127)      
Shares still expected to vest (in shares) 0      
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      
Number of shares for rights offering, in share-based payment arrangement (in shares) 32,526      
Revision for forfeitures (in shares) (34,857)      
Revision for cancellations (in shares) (4,996)      
Total before issuances (in shares) 368,732      
Shares issued (in shares) (100,362) (113,653) (3,571)  
Performance conditions (in shares) 0      
Shares still expected to vest (in shares) 151,146      
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      
Number of shares for rights offering, in share-based payment arrangement (in shares) 0      
Revision for forfeitures (in shares) (257,293)      
Revision for cancellations (in shares) 0      
Total before issuances (in shares) 308      
Shares issued (in shares) (141) 0 (17) (150)
Performance conditions (in shares) 0      
Shares still expected to vest (in shares) 0      
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      
Number of shares for rights offering, in share-based payment arrangement (in shares) 0      
Revision for forfeitures (in shares) (32,253)      
Revision for cancellations (in shares) 0      
Total before issuances (in shares) 308,718      
Shares issued (in shares) (100,654) (87,141) (96,629) (24,294)
Performance conditions (in shares) 0      
Shares still expected to vest (in shares) 0