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Operating expenses, General and Administrative Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
General and Administrative Expenses [abstract]      
Total compensation to employees and Directors $ 11,763 $ 11,890 $ 14,163
Office and administrative expenses 3,818 3,351 2,413
Audit, legal and consultancy 1,308 1,325 1,313
Total general and administrative expenses $ 16,889 $ 16,565 $ 17,890