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Performance B.4.3. Directors and executive management (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2019
Employee Benefits Expense [Line Items]        
Remuneration charge for the Board (gross of withholding tax) $ 1,638 $ 1,488 $ 1,923  
Remuneration charge (in shares) 24,737 32,358 19,483 2,876
Remuneration expense, percent shares 73.00% 71.00% 73.00%  
Remuneration expense, percent cash 27.00% 29.00% 27.00%  
Shares beneficially owned by the Directors 79,656 66,020    
Classes of employee benefits expense:        
Base salary $ 383,000 $ 356,000 $ 358,000  
Pension 6,000 4,000 4,000  
Other benefits 27,000 27,000 39,000  
Share based compensation(i)(ii) in respect of 2021 LTIP 17,000 24,000 27,000  
Employee benefits expense $ 503,000 $ 477,000 496,000  
Shares awards vested (in shares) 453,969 364,157    
Shares not yet vested (in shares) 574,234 622,567    
Chairperson        
Employee Benefits Expense [Line Items]        
Remuneration charge for the Board (gross of withholding tax) $ 300 $ 300 366  
Shares beneficially owned by the Directors 18,634 13,427    
Other members of the Board        
Employee Benefits Expense [Line Items]        
Remuneration charge for the Board (gross of withholding tax) $ 1,338 $ 1,188 1,557  
Shares beneficially owned by the Directors 61,022 52,593    
CEO        
Classes of employee benefits expense:        
Base salary $ 1,185 $ 1,173 1,167  
Bonus 2,164 1,301 1,428  
Pension 284 285 279  
Other benefits 88 82 50  
MSU 991      
Termination benefits     0  
Total before share based compensation 4,712 2,841 2,924  
Share based compensation(i)(ii) in respect of 2021 LTIP 7,914 7,114 5,625  
Employee benefits expense $ 12,626 $ 9,955 $ 8,549  
Number of shares granted (in shares) 196,904 153,894 102,122  
Shares awards vested (in shares) 232,562 194,432    
Shares not yet vested (in shares) 278,666 325,250    
CFO        
Classes of employee benefits expense:        
Base salary $ 708 $ 670 $ 654  
Bonus 969 509 626  
Pension 106 100 98  
Other benefits 46 38 260  
MSU 198      
Termination benefits     0  
Total before share based compensation 2,027 1,317 1,639  
Share based compensation(i)(ii) in respect of 2021 LTIP 1,652 1,834 1,576  
Employee benefits expense 3,679 3,151 3,215  
Executive team        
Classes of employee benefits expense:        
Base salary 2,783 2,612 3,498  
Bonus 2,718 1,837 2,098  
Pension 652 663 798  
Other benefits 791 303 1,521  
MSU 545      
Termination benefits     863  
Total before share based compensation 7,489 5,414 8,779  
Share based compensation(i)(ii) in respect of 2021 LTIP 5,383 3,796 5,965  
Employee benefits expense $ 12,872 $ 9,210 $ 14,743  
Number of shares granted (in shares) 211,578 135,269 135,480  
Shares awards vested (in shares) 221,407 169,725    
Shares not yet vested (in shares) 295,568 297,317