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General & Administrative Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
General And Administrative Expenses [Abstract]      
Total Compensation to Employees and Directors $ 11,655 $ 15,998 $ 17,626
Office and Administrative Expenses 2,147 2,213 2,407
Audit, Legal and Consultancy 3,377 1,180 1,573
Total General and Administrative Expenses $ 17,180 $ 19,391 $ 21,607