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Performance B.4.3. Directors and executive (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Employee Benefits Expense [Line Items]      
Remuneration charge for the Board (gross of withholding tax) $ 943 $ 1,122 $ 1,143
Remuneration expense, percent cash | shares 6,591 8,731 8,002
Remuneration expense, percent shares 51.00% 52.00% 50.00%
Renumeration charge, shares (in shares) 49.00% 48.00% 50.00%
Shares beneficially owned by the Directors | shares 23,887 27,067  
Classes of employee benefits expense:      
Base salary $ 356,000 $ 320,000 $ 290,000
Pension 7,000 8,000 6,000
Other benefits 70,000 45,000 74,000
Share based compensation 21,000 22,000 14,000
Employee benefits expense $ 514,000 $ 451,000 451,000
Shares awards vested (in shares) | shares 207,092 136,047  
Shares not yet vested (in shares) | shares 512,211 447,391  
Chairperson      
Employee Benefits Expense [Line Items]      
Remuneration charge for the Board (gross of withholding tax) $ 169 $ 233 243
Shares beneficially owned by the Directors | shares 8,554 7,000  
Other members of the Board      
Employee Benefits Expense [Line Items]      
Remuneration charge for the Board (gross of withholding tax) $ 774 $ 889 900
Shares beneficially owned by the Directors | shares 15,333 20,067  
CEO      
Classes of employee benefits expense:      
Base salary $ 1,112 $ 1,000 1,000
Bonus 1,492 707 660
Pension 247 150 150
Other benefits 66 64 48
Termination benefits 0    
Total before share based compensation 2,918 1,921 1,858
Share based compensation 5,027 2,783 2,660
Employee benefits expense $ 7,945 $ 4,704 $ 4,518
Number of shares granted (in shares) 80,264 61,724 49,171
Shares awards vested (in shares) | shares 122,310 80,159  
Shares not yet vested (in shares) | shares 172,485 148,324  
CFO      
Classes of employee benefits expense:      
Base salary $ 673 $ 648 $ 599
Bonus 557 455 450
Pension 101 97 82
Other benefits 63 15 18
Termination benefits 0    
Total before share based compensation 1,393 1,215 1,149
Share based compensation 1,567 1,492 1,481
Employee benefits expense 2,960 2,707 2,630
Executive team (9 members)      
Classes of employee benefits expense:      
Base salary 3,930 3,822 3,797
Bonus 2,445 1,590 1,411
Pension 962 629 513
Other benefits 805 1,193 720
Termination benefits 301    
Total before share based compensation 8,444 7,233 6,441
Share based compensation 4,957 5,202 4,031
Employee benefits expense $ 13,401 $ 12,435 $ 10,472
Number of shares granted (in shares) 112,472 167,371 104,573
Shares awards vested (in shares) | shares 84,782 55,888  
Shares not yet vested (in shares) | shares 339,726 299,067