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Other Investments (Narrative) (Details)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended
Sep. 30, 2013
USD ($)
Sep. 30, 2014
Sep. 30, 2013
USD ($)
Dec. 31, 2013
USD ($)
Feb. 28, 2014
Midas Gold Corp [Member]
USD ($)
Feb. 28, 2014
Midas Gold Corp [Member]
CAD
Apr. 30, 2011
Midas Gold Corp [Member]
Sep. 30, 2014
Midas Gold Corp [Member]
Dec. 31, 2013
Midas Gold Corp [Member]
Apr. 30, 2011
Midas Gold Corp [Member]
Private Placement [Member]
USD ($)
Subsidiary, Sale of Stock [Line Items]                    
Number of shares issued in transaction, (Shares)             30,402,615      
Number of shares acquired (in shares)                   1,400,000
Aggregate purchase price                   $ 3,632
ProceedsFromSaleOfInvestmentProjects         (11,640) 12,800        
CommonStockSharesIssued         16,000,000 16,000,000        
Common stock, shares held (in shares)   82,275,217   82,275,217         31,802,615  
Stock Issued During Period, Value, New Issues       477            
Total Midas Common Stock Outstanding (in shares)               15,802,615    
Percentage of basic shares of subsidiary held   11.20%   24.90%            
Deferred income tax benefit/(expense) $ (1)   $ 15,373              
Common Stock Shares Outstanding   82,275,217   82,275,217         31,802,615  
Total Midas Common Stock Outstanding (in shares)               15,802,615