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Mining Properties (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2017
Feb. 28, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]              
Gain (loss) on sale of assets and investments       $ 0 $ 21,138 $ 0 $ 0
Joaquin Project - Argentina              
Property, Plant and Equipment [Line Items]              
Transfer of financial assets accounted for as sales, 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              
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