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Mining Properties (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2017
Feb. 28, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Property, Plant and Equipment [Line Items]            
Gain (loss) on sale of assets and investments     $ 0 $ 0 $ 21,138 $ 0
Available-for-sale Securities     $ 29,125   29,125  
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]            
Gain (loss) on sale of assets and investments $ 1,200          
Transfers of Financial Assets Accounted for as Sale, Initial Fair Value of Assets Obtained as Proceeds 13,000          
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Outstanding Balance $ 6,700