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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 2,876 19,483
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