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Mining Properties (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 09, 2017
Property, Plant and Equipment [Line Items]            
Gain (loss) on sale of assets and investments   $ 0 $ 0 $ 21,138 $ 0  
Joaquin Project - Argentina [Member]            
Property, Plant and Equipment [Line Items]            
Transfer of Financial Assets Accounted for as Sales, Cash Proceeds Received for Assets Derecognized, Amount $ 27,400          
Net Smelter Return Percentage Paid 2.00%          
Gain (loss) on sale of assets and investments       $ 21,100    
Non-core three royalties and stream [Member]            
Property, Plant and Equipment [Line Items]            
Transfer of Financial Assets Accounted for as Sales, Cash Proceeds Received for Assets Derecognized, Amount           $ 13,000