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Other accounts payable (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2008
Dec. 31, 2007
Dec. 31, 2006
Disclosure of other accounts payable [Abstract]            
Mining royalties $ 21,526 $ 31,217 $ 27,611 $ 13,200 $ 13,200 $ 13,200
Interest and penalties 23,800     $ 18,900 $ 18,900 $ 18,900
Deferred Interest And Penalties 41,400          
Mining Royalties Non Current 85,500          
Interest And Penalties Non Current $ 129,600