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General & Administrative Expenses, Compensation of executives and directors (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
General & Administrative Expenses [Abstract]      
Cash compensation $ 3,897 $ 3,518 $ 3,989
Pension cost 33 36 202
Share compensation [1] 4,364 2,003 2,250
Total remuneration $ 8,293 $ 5,556 $ 6,441
[1] Share compensation reflects the expense recognized.