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General & Administrative Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
General & Administrative Expenses [Abstract]      
Total Compensation to Employees and Directors $ 10,331 $ 11,289 $ 11,655
Office and Administrative Expenses 2,633 2,449 2,147
Audit, Legal and Consultancy 1,826 1,314 3,377
Total General and Administrative Expenses $ 14,789 $ 15,052 $ 17,180