General and administrative expenses (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
General And Administrative Expenses [Abstract]
Total Compensation to Employees and Directors	$ 11,289	$ 11,655	$ 15,998
Office and Administrative Expenses	2,449	2,147	2,213
Audit, Legal and Consultancy	1,314	3,377	1,180
General and Administrative Expenses	$ 15,052	$ 17,180	$ 19,391

The amount of expense relating to general and administrative activities of the entity.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2017-03-09

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